(h)Cyclic acetal formation occurs when aldehydes react with ethylene glycol.(i)Aldehydes react with primary amines to yield imines.(j)Secondary amines combine with aldehydes to yield enamines.(k)Oximes are formed on reaction of hydroxylamine with aldehydes.(l)Hydrazine reacts with aldehydes to form hydrazones.(m)Hydrazone formation is the frst step in the Wolff–Kishner reduction (Section 12.8).(n)The reaction of an aldehyde with p-nitrophenylhydrazine is analogous to that with hydrazine.H2O1PropanalPropanalp-nitrophenylhydrazoneCH3CH2CHNNHNO2CH3CH2CHO1p-NitrophenylhydrazineO2NNHNH2CH3CH2CHNNH2Propanal hydrazoneN21CH3CH2CH3PropaneNaOHtriethylene glycol, heat
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