chapter 1 organic chemistry
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Chapter 1 Organic Chemistry. Organic chemistry: the study of the compounds of carbon. Organic compounds are made up of carbon and only a few other elements. chief among these are hydrogen, oxygen, and nitrogen - PowerPoint PPT PresentationTRANSCRIPT
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Chapter 1Organic Chemistry
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Organic chemistry: the study of the compounds of carbon.Organic compounds are made up of carbon
and only a few other elements.chief among these are hydrogen, oxygen,
and nitrogenalso present are sulfur, phosphorus, and
halogens (fluorine, chlorine, bromine, or iodine)
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Why Carbon?
Why is organic chemistry a separate discipline within chemistry?
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The sheer number of organic compounds Chemists have discovered or made over 10
million organic compounds and an estimated 100,000 new ones are discovered or made each year.
By comparison, chemists have discovered or made an estimated 1.7 million inorganic compounds.
Thus, approximately 85% of all known compounds are organic.
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The link to biochemistryCarbohydrates, lipids, proteins, enzymes,
nucleic acids, hormones, vitamins, and almost all other chemicals in living systems are organic compounds.
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Historical: scientists at one time believed that a “vital force” present in living organisms was necessary to produce an organic compound.The experiment of Wöhler in 1828 was the
first in a series of experiments that led to the demise of the vital force theory.
NH4Cl AgNCO H2N-C-NH2
OAgCl+ heat +
Ammoniumchloride
Silvercyanate
Urea Silverchloride
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Organic Compounds Inorganic CompoundsBonding is almost entirely covalentMay be gases, liquids, or solidswith low melting points (lessthan 360°C)Most are insoluble in waterMost are soluble in organic solventssuch as diethyl ether, toluene, and dichloromethaneAqueous solutions do notconduct electricityAlmost all burnReactions are usually slow
Most have ionic bondsMost are solids with high melting points
Many are soluble in waterAlmost all are insoluble in organic solvents
Aqueous solutions conductelectricityVery few burnReactions are often very fast
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O
O
O CH2OH
OH
OH
H
CH2OH
OH
OHOH
H
H
H
H
H
H
HH
Sucrose (table sugar) Sodium chloride (table salt)
Na+ Cl-
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Structure
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Structural formula: shows the atoms present in a molecule as well as the bonds that connect them.
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Lewis structure: A molecular representation that shows both the connections among atoms and the locations of lone-pair valence electrons.
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Common bonding patterns for C, N, O, X, and H
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• VSEPR model: the most common bond angles are 109.5°, 120°, and 180°.
H-C-C-HH
H H
H H
HC C
H
HH-C C-H
H-C-O-HH
H
HC O
HH-C-N-HH
HH
HN
H HC
H-C-C-ClH
H H
H
Ethane(bond angles
109.5°)
Ethylene(bond angles
120°)
Acetylene(bond angles
180°)
Methanol(bond angles
109.5°)
Formaldehyde(bond angles
120°)
Methanamine(bond angles
109.5°)
Methyleneimine(bond angles 120°)
Chloroethane(bond angles
109.5°)
::
::::
::
:
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3-D structure: Shows orientation in space, using wedges and dashes.
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Condensed structure: Bonds are not specifically shown.
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line-angle formula: A line represents a carbon-carbon bond and a
vertex and a line terminus represent a carbon atom.
Hydrogen atoms are not shown in line-angle formulas.
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CH3CH2CH2CH3CH3CH2CH3 CH3CH2CH2CH2CH3CH3CH2CH2CH3CH3CH2CH3 CH3CH2CH2CH2CH3PentaneButanePropane PentaneButanePropane
Condensedstructural
formula
Line-angleformula
Ball-and-stick model
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Constitutional isomers—compounds with the same molecular formula, but with different structural formulas (different connectivity).
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• For the molecular formula C4H10, two constitutional isomers are possible.
CH3CH2CH2CH3 CH3CHCH3
CH3
Butane(bp -0.5°C)
2-Methylpropane(bp -11.6°C)
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Functional Groups
Functional group: an atom or group of atoms within a molecule that shows a characteristic set of predictable physical and chemical properties.
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-OH-NH2
-C-H
-C-
CH3CH2OHCH3CH2NH2
CH3CHO
CH3CCH3
O
CH3COHO
-C-OH
ExampleAlcoholAmine
Aldehyde
Ketone
Carboxylic acid
EthanolEthanamine
Ethanal
Acetone
Acetic acid
NameFamilyFunctionalgroup
CH3COCH2CH3
O-C-ORCarboxylic ester Ethyl acetate
O
O
O
O
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Alcohol: contains an OH (hydroxyl) group bonded to a tetrahedral carbon atom. For example, ethanol:
R-C-O-HR
RCH3CH2OH
H
HH
HH-C-C-O-H
Structuralformula
Functional group(R = H or carbon
goup
Condensedstructuralformula
::
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CH3-C-OHH
HCH3-C-OH
CH3
HCH3-C-OH
CH3
CH3
A 1° alcohol A 3° alcoholA 2° alcohol
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Amine: a compound containing an amino group.• the amino group may be primary (1°),
secondary (2°), or tertiary (3°).
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CH3NHCH3
CH3NH2 CH3NCH3
CH3
(CH3)3N(CH3)2NH
Methylamine(a 1° amine)
Dimethylamine(a 2° amine)
Trimethylamine(a 3° amine)
or or
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Carbonyl group: C=O
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• Aldehyde: contains a carbonyl group bonded to a hydrogen; in formaldehyde, the simplest aldehyde, the carbonyl group is bonded to two hydrogens.
• Ketone: contains a carbonyl group bonded to two carbon atoms.
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CH3CHO O
CH3CCH3C-C-HRR
ROC-C-CO
RRRR
R R
Functionalgroup
Functionalgroup
Acetaldehyde(an aldehyde)
Acetone(a ketone)
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Carboxylic acid: a compound containing a -COOH (carboxyl: carbonyl + hydroxyl) group.
• In a condensed structural formula, a carboxyl group may also be written -CO2H.
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RCOHO
CH3COHO
Functionalgroup
Acetic acid(a carboxylic acid)
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Carboxylic ester: a derivative of a carboxylic acid in which the H of the carboxyl group is replaced by a carbon group.
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C-O–CO
CH3COOCH3
Functionalgroup
Methyl acetate(an ester)
CH3-C-O-CH3
Oor CH3CO2CH3or
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Summary of Topics: Chapter 1
What is Organic Chemistry? Structural formulas
Lewis, condensed, line-angle Constitutional isomers Functional groups