The reaction of ethyl 2-(triphenylphosphoranylidene) acetate or propionate 3a–b with α-chalcogeno ketenes generated in situ by the reaction of α-chalcogeno acid chlorides 1–2 with triethylamine in dichloromethane gives moderate to good yields of 4-phenylchalcogeno allenic esters 4. The corresponding 4-phenylseleno allenic esters 4a–e were obtained in isolated yields of 60 to 93%, while 4-phenylthio
乙基2-(三苯基亚正膦)
乙酸甲酯或
丙酸乙酯反应3A - b与由α-chalcogeno酰
氯的反应在原位产生的α-chalcogeno烯酮1 - 2用
二氯甲烷中的
三乙胺使中度至4- phenylchalcogeno
丙二烯酯良好的产率4。以60至93%的分离产率获得了相应的4-苯基
硒烯
丙酸酯4a – e,而以74至93%的分离产率获得了4-苯基
硫代烯
丙酸酯4f – j。