(4-Bromobut-2-en-1-yl)triphenylphosphonium bromide reacted with phenylhydrazine at 2A degrees C in the presence of sodium carbonate to form triphenyl[4-(2-phenylhydrazinylidene)but-2-en-1-yl]phosphonium bromide in 62% yield. The obtained N-phenylhydrazine derivatives cyclized into the corresponding pyrazoline derivatives of phosphonium salts. Unlike phenylhydrazine, ethylhydrazine reacted with (4-bromobut-2-ene-1-yl)triphenylphosphonium bromide under the same conditions to afford triphenyl[(1-ethyl-4,5-dihydro-1Hpyrazol-3-yl)methyl]- and -[(1-ethyl-1H-pyrazol-3-yl)methyl]phosphonium bromides in yields of 60 and 40%.
(4-
溴丁-2-烯-1-基)三苯基
磷钾溴化物在
碳酸钠的存在下与苯基
肼于2A°C发生反应,生成62%收率的三苯基[4-(2-苯基亚
肼基)丁-2-烯-1-基]
磷钾溴化物。所获得的N-苯基
肼衍
生物环化为相应的
吡唑啉
磷钾盐衍
生物。与苯基
肼不同,乙基
肼在相同条件下与(4-
溴丁-2-烯-1-基)三苯基
磷钾溴化物反应,分别以60%和40%的收率得到三苯基[(1-乙基-4,5-二氢-1H
吡咯-3-基)甲基]
磷钾溴化物和三苯基[(1-乙基-1H
吡咯-3-基)甲基]
磷钾溴化物。