Triphenylphosphine → ethyl (Z)-dodec-5-enoate

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반응 단계

Heptyltriphenylphosphonium bromide (16.8g), prepared from 1-bromoheptane and triphenylphosphine analogously to undecyltriphenylphosphonium bromide as described in Example 2(2), is suspended in dry ether (300 ml) and the mixture is treated whilst stirring under nitrogen with 1.7 M butyllithium in hexane (36 ml) from a syringe. The resulting bright red solution is cooled to 10° C. and treated dropwise with ethyl 5-oxopentanoate [5.5 g, prepared as described in Example 2 (1B)] in dry ether (37.5 ml). After 10 minutes, the reaction mixture is worked up by the procedure described in Example 2(2) to give ethyl (Z)-dodec-5-enoate as a yellow oil (8.6g).

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