Question

What is the better way to prepare $3$-ethyl-$3$-heptene?

• A. Make a Wittig reagent from $1$-bromobutane and combine that with $3$-pentanone
• B. Make a Wittig reagent from $3$-bromopentane and combine that with butanal
• C. It does not matter because they will work equally well
• D. It does not matter because neither method will be successful

Answer 1

The correct option is B Make a Wittig reagent from $3$-bromopentane and combine that with butanal

The Wittig Reaction allows the preparation of an alkene by the reaction of an aldehyde or ketone with the ylide generated from a phosphonium salt.