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\\CH_3CH_2CHO+Ph_3P=CHC_2H_5\overset{A}{\longrightarrow}Ph_3PO+CH_3CH_2CH=CHC_2H_5

What is A in the above reaction?

Option: 1

THF or dry ether


Option: 2

Na/liq. NH_3


Option: 3

CCl_4


Option: 4

KOH(alc.)


Answers (1)

best_answer

As we have learnt,

Wittig's Reaction -

In this reaction, methylene triphenyl phosphorane or phosphorous ylide is treated with a carbonyl compound to prepare an alkene. The mechanism of the reaction is given below.

Mechanism

In this reaction, carbonyl compound treated with ylide in the presence of ethers like THF 

\mathrm{CH_{3}-CH_{2}CHO\: +\: Ph_{3}P=CHC_{2}H_{5}\: \overset{THF\: or\: dry\: ether}{\longrightarrow}\: Ph_{3}PO\: +CH_{3}CH_{2}CH=CHC_{2}H_{5}}

Therefore, option (1) is correct.

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