Identify the alkene product in each of the following Wittig reactions:(a) Benzaldehyde +  ...

Identify the alkene product in each of the following Wittig reactions:

(a) Benzaldehyde +  

(b) Butanal +  

(c) Cyclohexyl methyl ketone +

Sample Solution (a) In a Wittig reaction the negatively charged substituent attached to phosphorus is transferred to the aldehyde or ketone, replacing the carbonyl oxygen. The reaction shown has been used to prepare the indicated alkene in 65% yield.