Selectivity in Rhodium(II)-Catalyzed Rearrangements of cycloprop-2-ene-1-carboxylates
作者:Paul Müller、Christian Gränicher
DOI:10.1002/hlca.19950780113
日期:1995.2.8
substituents of the cyclopropene ring. Product composition is markedly influenced by the number, nature, and position of the substituents, which determine the regio- and stereoselectivity of the cyclopropene-ring cleavage. A mechanism is proposed in which attack of the electrophilic RhII species is concerted with disrotatory ring opening of the incipient cyclopropyl cation and affords a metal-complexed
通过改变环丙烯环的取代基,研究了在四(全氟丁酸酯)二(二[Rh 2(pfb)4) ] (二)吡啶鎓(II)存在下,环丙-2-烯-1-羧酸酯的热催化重排过程。产物组成显着受取代基的数量,性质和位置影响,所述取代基确定环丙烯环裂解的区域选择性和立体选择性。提出了一种机制,其中亲电Rh II物种的攻击与初始环丙基阳离子的旋转性开环协同作用,并提供了金属络合的乙烯基卡宾。后者的化学选择性与在[Rh 2(pfb)4]。