Observe this compound:
Starting from benzylbromide, which sequence helps synthesize the given (above) compound ?
1: Reaction with (Ph)3P:
2: Reaction with a super strong base
3: Reaction with cylohexanone
1; 2; 3
Start with benzylbromide. Treat it with triphenylphosphine and get to the salt.
This salt, when treated with a super strong base like n-BuLi (n-butyl lithium),
loses a proton and becomes a phosphorus ylid.
This, when made to react with cyclohexanone, gives benzylidene cyclohexane: