Download - Some problems using C and H 2 D NMR
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Some problems using C and H 2 D NMR
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A compound has a molecular weight of 114 mass units and is know only to contain C, H, and O. What are the possible formulas?
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A compound has a molecular weight of 114 mass units and is know only to contain C, H, and O. What are the possible formulas?
114/13 = 8.769; 13*0.769 = 10; C8H18;
C7H14O; C6H10O2 ...1. carbon count
2. carbonyl group
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C7H14O
proton countCH3(CH2)3COCH2CH3
CH3CH2CH2CH2COCH2CH3
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A compound has a molecular weight of 102 mass units and is know only to contain C, H, and O. What are the possible formulas?102/13 =7.846; 13*0.846 = 11; C7H18;C6H14O; C5H10O2 ...
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C6H14O
(CH3)2CH2CH2CHOHCH3(CH3)2CHCH2CHOHCH3
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C=O 1721 cm-1
The compound has a molecular weight of 178. What is its structure?
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The compound has a molecular weight of 178. What is its structure?
178/13 = 13.692
.692*13 = 9
C13H22
C12H18O
C11H14O2
Carbon count =
proton count = 14
11
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PhCO2(CH2)3CH3
5 2 2 2 3
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The following spectra refer to a compound with a molecular weight of 86 containing C,H and O.
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86/13 = 6.615; 0.615*13 =8
C6H14; C5H10O; C4H6O2 ...
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7
H2C=CH-CH(CH3)-CH2OH
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Assign the correct structure A or B to the H NMR spectrum given below
B 1
3