a)
Interpretation:
A structure for ketone or aldehyde with the following descriptions is to be proposed.
C4H7ClO, IR: 1715 cm-1; 1HNMR: 1.62 δ (Rel.area=3.00), 2.33 δ (Rel.area=3.00), 4.32δ (Rel.area=1.00).
Concept introduction:
In 1HNMR the aldehyde protons absorb near 10 δ with a coupling constant , J = 3Hz. Hydrogens on the carbon next to aldehyde group absorb near 2.0-2.3 δ. Methyl ketones show a sharp three proton singlet near 2.1 δ.
To purpose:
A structure for ketone or aldehyde with the following descriptions.
C4H7ClO, IR: 1715 cm-1; 1HNMR: 1.62 δ (Rel.area=3.00), 2.33 δ (Rel.area=3.00), 4.32δ (Rel.area=1.00).
b)
Interpretation:
A structure for ketone or aldehyde with the following descriptions is to be proposed.
C7H14O, IR: 1710 cm-1; 1HNMR: 1.02 δ (Rel.area=4.50), 2.12 δ (Rel.area=1.50), 2.33δ (Rel.area=1.00).
Concept introduction:
Aldehydes and ketones show a strong absorption band in IR from 1660-1770 cm-1. Aldehydes show two characteristic C-H absorptions between 2700-2760 cm-1 and 2800-2860 cm-1. Saturated aldehydes absorb near 1730 cm-1 while aromatic aldehydes and α, β- unsaturated aldehydes absorb near 1705 cm-1. Saturated ketones and cyclohexanones absorb near 1715 cm-1 while aromatic ketones and α, β- unsaturated ketones absorb near 1685-1690 cm-1. Cyclopentanones absorb around 1750 cm-1.
In 1HNMR the aldehyde protons absorb near 10 δ with a coupling constant , J = 3Hz. Hydrogens on the carbon next to aldehyde group absorb near 2.0-2.3 δ. Methyl ketones show a sharp three proton singlet near 2.1 δ.
To purpose:
A structure for ketone or aldehyde with the following descriptions.
C7H14O, IR: 1710 cm-1; 1HNMR: 1.02 δ (Rel.area=4.50), 2.12 δ (Rel.area=1.50), 2.33δ (Rel.area=1.00).
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Organic Chemistry
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