chapter 22 organic chemistry prentice hall john e. mcmurray and robert c. fay general chemistry:...
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![Page 1: Chapter 22 Organic Chemistry Prentice Hall John E. McMurray and Robert C. Fay General Chemistry: Atoms First](https://reader034.vdocuments.net/reader034/viewer/2022050819/56649d615503460f94a42bd4/html5/thumbnails/1.jpg)
Chapter 22Organic
Chemistry
Prentice Hall
John E. McMurray and Robert C. Fay
General Chemistry: Atoms First
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Uses of HydrocarbonsNumber of
C atomsState Major Uses
1-4 gasheating and cooking fuel
5-7liquids,
(low boiling)solvents, gasoline
6-18 liquids gasoline
12-24 liquidsjet fuel; camp stove fuel
18-50liquids,
(high boiling)
diesel fuel, lubricants, heating oil
50+ solidspetroleum jelly, paraffin wax
1-4 gasheating and cooking fuel
5-7liquids,
(low boiling)solvents, gasoline
6-18 liquids gasoline
12-24 liquidsjet fuel; camp stove fuel
18-50liquids,
(high boiling)
diesel fuel, lubricants, heating oil
50+ solidspetroleum jelly, paraffin wax
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Structure Determines Properties
• Organic compounds all contain carbonCO, CO2 , carbonates and carbides are inorganic
other common elements are H, O, N, (P, S)
• Carbon has versatile bonding patterns chains, rings, single, double and triple bondschain length nearly limitless
• Carbon compounds generally covalent
• C - C bonds unreactive (very stable)
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Bond Energies and Reactivities
C-C 347 kJ H3C-CH3NONREACTIVEIN AIR
S-S 214 kJ HS-SH EXTREMELYREACTIVE
Si-Si 213 kJ H3Si-SiH3SPONTANEOUSBURNS IN AIR
N-N 159 kJ H2N-NH2EXTREMELYREACTIVE
O-O 138 kJ HO-OH REACTIVE
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alkanes
CH3
CH
CH
CH3CH3
CC
CH3
CH3
CH3
CH
CH2 CH2
CH2
CH2
CH
alkenes
CH3 C C CH3
CH2
CH2 CH2
CH2
CH2
CH2CH2
C C CH2
CH2
CH2
CH2
CH2
CH2
CH2
alkynes
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• Methane - 1 Carbon
• Ethane - 2 Carbon Chain
• Propane - 3 Carbon Chain
• Butane - 4 Carbon Chain
• Pentane - 5 Carbon Chain
• Hexane - 6 Carbon Chain
• Heptane - 7 Carbon Chain
• Octane - 8 Carbon Chain
• Nonane - 9 Carbon Chain
• Decane - 10 Carbon Chain
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The Nature of Organic Molecules
• Carbon is tetravalent. It has four outer-shell electrons (1s22s22p2) and forms four bonds.
Organic Chemistry: The study of carbon compounds.
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The Nature of Organic Molecules• Organic molecules have covalent bonds. In
ethane, for instance, all bonds result from the sharing of two electrons.
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The Nature of Organic Molecules• Organic molecules have polar covalent bonds
when carbon bonds to an element on the right or left side of the periodic table.
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The Nature of Organic Molecules• Carbon can form multiple covalent bonds by
sharing more than two electrons with a neighboring atom.
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The Nature of Organic Molecules• Organic molecules have specific three-
dimensional shapes, which can be predicted by the VSEPR model.
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The Nature of Organic Molecules• Organic molecules have specific three-
dimensional shapes, which can be predicted by the VSEPR model.
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The Nature of Organic Molecules• Carbon uses hybrid atomic orbitals for bonding.
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Alkanes and Their IsomersHydrocarbons: Molecules that contain only carbon and hydrogen.
Alkanes: Hydrocarbons that contain only single bonds.
Space-filling models:
Structural formulas:
Molecular formulas:
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Alkanes and Their IsomersIsomers: Compounds with the same molecular formula but different chemical structures.
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Isomerism• Isomers = different molecules with the same molecular
formula• Structural Isomers = different pattern of atom attachment
Constitutional Isomers
• Stereoisomers = same atom attachments, different spatial orientation
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Free Rotation AroundC─C
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Rotation about a bond is not isomerism
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Structural Isomers of C4H10
Butane, BP = 0°C Isobutane, BP = -12°C
C C C C
H
H
H H
H H
H H
H
HC
H
H
H
H H
H
C HC
CH H
H
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Possible Structural IsomersCarbonContent
MolecularFormula
PossibleIsomers
4 C4H10 25 C5H12 36 C6H14 57 C7H16 98 C8H18 189 C9H20 35
10 C10H22 75
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Geometric Isomerism
• because the rotation around a double bond is highly restricted, you will have different molecules if groups have different spatial orientation about the double bond
• this is often called cis-trans isomerism
• when groups on the doubly bonded carbons are cis, they are on the same side
• when groups on the doubly bonded carbons are trans, they are on opposite sides
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Cis-Trans Isomerism
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Drawing Structural Formulas
• draw and number the base chain carbon skeleton
• add the carbon skeletons of each substituent on the appropriate main chain C
• add in required H’s
4-ethyl-2-methylhexane
C C C CC C
C C C
CH3 CH2 CH2 CH3CH CH
CH3 H2C CH3
C C C C C C1 2 3 4 5 6
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Practice – Draw the structural formula of 4-isopropyl-2-methylheptane
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Practice – Draw the structural formula of 4-isopropyl-2-methylheptane
CH3 CH2 CH2CH CH
CH3 CH3HC
CH3
CH2 CH3
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Drawing Organic StructuresCondensed Formula
StructuralFormula
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Ex 20.1 – Write the structural formula of all isomers and carbon skeleton formula for C6H14
start by connecting the carbons in a line
determine the C skeleton of the other isomers
C C C C C CC C C C C
C
C C C C C
CC C C C
C
CC C C C
C C
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fill in the H to give each C 4 bonds
C C C C
C
CH
H
H
H H H
H
H
H
HHHH
H
C C C C
C
C
H
H
H H H
HHHH
H
H
H
H
H
C C C C C CH
H
H
H
H
H
H
H
H
H H
H
HH
Ex 20.1 – Write the structural formula and carbon skeleton formula for C6H14
C C C C
C
H
H
H H
HH
HH
H
HH
C H
H
H
C C C C C C
C C C C C
C
C C C C C
C
C C C C
C
CC C C C
C C
C C C C
C
H
H
H H
H
CHHH
HH
H
HH
H
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convert each to a carbon skeleton formula – each bend and the ends represent C atoms
C C C C
C
CH
H
H
H H H
H
H
H
HHHH
H
C C C C
C
C
H
H
H H H
HHHH
H
H
H
H
H
C C C C C CH
H
H
H
H
H
H
H
H
H H
H
HH
Ex 20.1 – Write the structural formula and carbon skeleton formula for C6H14
C C C C
C
H
H
H H
HH
HH
H
HH
C H
H
H
C C C C
C
H
H
H H
H
CHHH
HH
H
HH
H
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Stereoisomers
• stereoisomers are different molecules whose atoms are connected in the same order, but have a different spatial direction, they can be:optical isomers - molecules that are non-
superimposable mirror images of each othergeometric isomers - stereoisomers that are not
optical isomers
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Optical Isomers - Nonsuperimposable Mirror Images
mirror image cannot be rotated so all its atoms align with the same atoms of the original molecule
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Chirality• any molecule with a non-superimposable mirror
image is said to be chiral• any carbon with 4 different substituents is called
a chiral center• a pair of non-superimposable mirror images are
called a pair of enantiomers
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Optical Isomers of 3-methylhexane
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Plane Polarized Light
• light that has been filtered so that only those waves traveling in a single plane are allowed through
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Optical Activity• a pair of enantiomers have all the same physical
properties except one – the direction they rotate the plane of plane polarized lighteach will rotate the plane the same amount, but in opposite
directionsdextrorotatory = rotate to the right levorotatory = rotate to the left
• an equimolar mixture of the pair is called a racemic mixture rotations cancel, so there is no net rotation of light
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Chemical Behavior of Enantiomers
• a pair of enantiomers will have the same chemical reactivity in a non-chiral environment
• but in a chiral environment they may exhibit different behaviorsenzyme selection of one enantiomer of a pair
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The Shapes of Organic Molecules
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Naming AlkanesIUPAC Rules
-ane suffix since they are alkanes
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Naming Alkanes1. Name the main chain. Find the longest
continuous chain of carbons in the molecule, and use the name of that chain as the parent name:
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Naming Alkanes2. Number the carbon atoms in the main chain.
Beginning at the end nearer the first branch point, number each carbon atom in the parent chain:
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Naming Alkanes3. Identify and number the branching substituent.
Assign a number to each branching substituent group on the parent chain according to its point of attachment:
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Naming Alkanes3. Identify and number the branching substituent.
Assign a number to each branching substituent group on the parent chain according to its point of attachment:
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Naming Alkanes• Write the name as a single word. Use hyphens to
separate the different prefixes, and use commas to separate numbers when there are more than one. If two or more different substituent groups are present, list them in alphabetical order. If two or more identical substituent groups are present, use one of the Greek prefixes:
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Naming Alkanes
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Naming Alkanes
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Naming Alkanes
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Example – Name the alkane
1) find the longest continuous C chain and use it to determine the base name
CH3CHCH2CHCH3
CH3 CH3
CH3CHCH2CHCH3
CH3 CH3
since the longest chain has 5 Cthe base name is pentane
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Example – Name the alkane
2) identify the substituent branches
CH3CHCH2CHCH3
CH3 CH3
there are 2 substituentsboth are 1 C chains, called methyl
CH3CHCH2CHCH3
CH3 CH3
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CH3CHCH2CHCH3
CH3 CH3
Example – Name the alkane
3) number the chain from the end closest to a substituent branch
if first substituents equidistant from end, go to next substituent in
both substituents are equidistant from the end
1 2 3 4 5
2 4
then assign numbers to each substituent based on the number of the main chain C it’s attached to
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CH3CHCH2CHCH3
CH3 CH3
Example – Name the alkane4) write the name in the following order
1) substituent number of first alphabetical substituent followed by dash2) substituent name of first alphabetical substituent followed by dash
if it’s the last substituent listed, no dash use prefixes to indicate multiple identical substituents
3) repeat for other substituents alphabetically4) name of main chain
2 4
2,4 – dimethylpentane
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Practice – Name the Following
CH3CHCHCH2CH3
CH3
CH2CH3
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Practice – Name the Following
CH3CHCHCH2CH3
CH3
CH2CH3
3-ethyl-2-methylpentane
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CycloalkanesCycloalkane: One or more rings of carbon atoms.
6 C3 C 4 C 5 C
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Cycloalkanes
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Cycloalkanes
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Reactions of Alkanes
Halogens (Cl2 or Br2):
CO2(g) + 2H2O(l)CH4(g) + 2O2(g) ∆H° = -802 kJ
Combustion:
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Reactions of Hydrocarbons
• all hydrocarbons undergo combustion
• combustion is always exothermicabout 90% of U.S. energy generated by combustion
2 CH3CH2CH2CH3(g) + 13 O2(g) → 8 CO2(g) + 10 H2O(g)
CH3CH=CHCH3(g) + 6 O2(g) → 4 CO2(g) + 4 H2O(g)
2 CH3CCCH3(g) + 11 O2(g) → 8 CO2(g) + 6 H2O(g)
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Other Alkane Reactions• Substitution
replace H with a halogen atominitiated by addition of energy in the form of
heat or ultraviolet light to start breaking bonds
generally get multiple products with multiple substitutions
C C
H H
H
HH
H
heat or UV light
H ClC C
H Cl
H
HH
HCl Cl + H Cl+
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Families of Organic Molecules: Functional Groups
Functional Group: An atom or group of atoms within a molecule that has a characteristic chemical behavior and that undergoes the same kinds of reactions in every molecule where it occurs.
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Alkenes and AlkynesAlkene: A hydrocarbon that contains a carbon-carbon double bond.
Alkyne: A hydrocarbon that contains a carbon-carbon triple bond.
Unsaturated: A hydrocarbon that contains fewer hydrogens per carbon than the related alkane.
Saturated: A hydrocarbon that contains the maximum possible number of hydrogens.
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Examples of Naming Alkenes
2-methyl-1-pentene
3-isopropyl-2,2-dimethyl-3-hexene
H H H
H C C C C C H
H CH3 H H H
H CH3 H H
H C C C C C C H
H CH3 CH H H H
CH3 CH3
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Name the Alkene1) find the longest, continuous C chain that
contains the double bond and use it to determine the base name
since the longest chain with the double bond has 6 Cthe base name is hexene
H3C CH C
H2C CH3
CH CH3
H2C CH3
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Name the Alkene
2) identify the substituent branches
there are 2 substituentsone is a 1 C chain, called methyl
the other one is a 2 C chain, called ethyl
H3C CH C
H2C CH3
CH CH3
H2C CH3
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H3C CH C
H2C CH3
CH CH3
H2C CH3
Name the Alkene
3) number the chain from the end closest to the double bond
then assign numbers to each substituent based on the number of the main chain C it’s attached to
1234
5 6
4
3
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Name the Alkene4) write the name in the following order
1) substituent number of first alphabetical substituent – substituent name of first alphabetical substituent – use prefixes to indicate multiple identical substituents
2) repeat for other substituents3) number of first C in double bond – name of main chain
3–ethyl– 4–methyl–2–hexene
H3C CH C
H2C CH3
CH CH3
H2C CH3
1234
5 6
4
3
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Practice – Name the Following
H3C C C
CH3
CH2 CH3
H2C CH3
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Practice – Name the Following
H3C C C
CH3
CH2 CH3
H2C CH3
3,4-dimethyl-3-hexene
12
3 4 5 6
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Alkenes and AlkynesAlkenes
-ene suffix since they are alkenes
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Alkenes and AlkynesAlkenes and Isomers
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Alkenes and AlkynesAlkenes and Isomers
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Alkenes and AlkynesAlkenes and Isomers
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Alkenes and AlkynesAlkynes
-yne suffix since they are alkynes
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Examples of Naming Alkynes
3-methyl-1-pentyne
4-isopropyl-5,5-dimethyl-2-hexyne
H H H
H C C C C C H
CH3 H H
H CH3 H H
H C C C C C C H
H CH3 CH H
CH3 CH3
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Name the Alkyne1) find the longest, continuous C chain that
contains the triple bond and use it to determine the base name
since the longest chain with the triple bond has 7 Cthe base name is heptyne
CH3 CH2 CCH CH
CH3 CH3HC
CH3
C CH3
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Name the Alkyne
2) identify the substituent branches
there are 2 substituentsone is a 1 C chain, called methylthe other one is called isopropyl
CH3 CH2 CCH CH
CH3 CH3HC
CH3
C CH3
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CH2 CCH CH
CH3 CH3HC
CH3
C CH3CH3
Name the Alkyne
3) number the chain from the end closest to the triple bond
then assign numbers to each substituent based on the number of the main chain C it’s attached to
46
1234567
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Name the Alkyne4) write the name in the following order
1) substituent number of first alphabetical substituent – substituent name of first alphabetical substituent – use prefixes to indicate multiple identical substituents
2) repeat for other substituents3) number of first C in double bond – name of main chain
4–isopropyl–6–methyl–2–heptyne
CH2 CCH CH
CH3 CH3HC
CH3
C CH3CH3
46
1234567
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Practice – Name the Following
H3C C
CH3
CH2CH3
C CH
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Practice – Name the Following
H3C C
CH3
CH2CH3
C CH
3,3-dimethyl-1-pentyne
123
4 5
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Reactions of Alkenes
• Addition of Hydrogen:
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Reactions of Alkenes
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Reactions of Alkenes• Addition of Cl2 and Br2:
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Reactions of Alkenes
• Addition of Water:
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Resonance Hybrid
• the true structure of benzene is a resonance hybrid of two structures
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Naming Monosubstituted Benzene Derivatives
• (name of substituent)benzenehalogen substituent = change ending to “o”
• or name of a common derivative
F
fluorobenzene
CH2CH2CH3
propylbenzene
CH3 NH2 OH HC CH2
toluene aniline phenol styrene
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Naming Benzene as a Substituent
• when the benzene ring is not the base name, it is called a phenyl group
H2C CH CH2 CH2 CH3CH
4-phenyl-1-hexene
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Naming Disubstituted Benzene Derivatives
• number the ring starting at attachment for first substituent, then move toward secondorder substituents alphabeticallyuse “di” if both substituents the same
F
Br1
23
1-bromo-3-fluorobenzene
CH3
CH31
2
1,2-dimethylbenzene
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Naming Disubstituted Benzene Derivatives
• alternatively, use relative position prefixortho- = 1,2; meta- = 1,3; para- = 1,4
CH3Cl
2-chlorotolueneortho-chlorotoluene
o-chlorotoluene
CH3
Cl
CH3
Cl3-chlorotoluene
meta-chlorotoluenem-chlorotoluene
4-chlorotoluenepara-chlorotoluene
p-chlorotoluene
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Practice – Name the Following
F
Cl
Br
Br
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Practice – Name the Following
F
Cl
Br
Br
1-chloro-4-fluorobenzene 1,3-dibromobenzeneor meta-dibromobenzene
or m-dibromobenzene
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Aromatic Compounds and Their Reactions
Aromatic: A class of compounds that contain a six-membered ring with three double bonds.
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Aromatic Compounds and Their Reactions
The stability of benzene comes from its six pi-bond electrons which are spread equally around the entire ring:
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Aromatic Compounds and Their Reactions
• Nitration (Substitution of a Nitro Group):
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Aromatic Compounds and Their Reactions
• Halogenation (Substitution of a Bromine or Chlorine):
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Alcohols, Ethers, and Amines
Alcohols: A class of compounds that contain a hydroxyl group (-OH).
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Alcohols, Ethers, and Amines
Simple alcohols are often soluble in water because of hydrogen bonding:
Alcohols
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Alcohols, Ethers, and Amines
Alcohols
-ol suffix since they are alcohols
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Alcohols, Ethers, and Amines
Alcohols
Some important alcohols:
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Alcohols, Ethers, and Amines
Alcohols
Some important alcohols:
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Alcohols, Ethers, and Amines
Alcohols
Some important alcohols:
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Alcohols, Ethers, and Amines
Ethers
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Alcohols, Ethers, and Amines
Amines
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Alcohols, Ethers, and Amines
Amines
AcidBase
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Aldehydes and Ketones
All have carbonyl groups
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Aldehydes and Ketones
-one suffix since they are ketones
-al suffix since they are aldehydes
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Aldehydes and Ketones
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Aldehydes and Ketones
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Carboxylic Acids, Esters, and Amides
These are bonded to a strongly electronegative atom (O or N).
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Carboxylic Acids, Esters, and Amides
All three undergo carbonyl-substitution reactions:
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Carboxylic Acids, Esters, and Amides
Carboxylic Acids
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Carboxylic Acids, Esters, and Amides
Carboxylic Acids
They are weaker than their strong inorganic counterparts.
For acetic acid, Ka = 1.8 x 10-5 (pKa = 4.74)
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Carboxylic Acids, Esters, and Amides
Carboxylic Acids
A common industrial solvent.
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Carboxylic Acids, Esters, and Amides
Esters
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Carboxylic Acids, Esters, and Amides
Esters
Hydrolysis:
Saponification (“soap”) is the base-catalyzed hydrolysis of naturally occurring esters in animal fat.
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Carboxylic Acids, Esters, and Amides
Amides
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Carboxylic Acids, Esters, and Amides
Amides
Hydrolysis:
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Synthetic PolymersPolymers: Large molecules formed by the repetitive bonding of many smaller molecules, called monomers.
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Synthetic Polymers
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Synthetic Polymers
Polymerization:
Initiator
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Synthetic Polymers
Polymerization: