Regioselectivity of the ring opening in the reaction of phenyloxirane, (phenylmethyl)oxirane and (2-phenylethyl)oxirane with K−, K+(15-crown-5)2
作者:Zbigniew Grobelny、Andrzej Stolarzewicz、Barbara Morejko-Buż、Adalbert Maercker、Stanisław、Krompiec、Tadeusz Bieg
DOI:10.1016/s0022-328x(03)00138-4
日期:2003.4
The electron from potassium anion of K−, K+(15-crown-5)2 (1) is initially transferred to the aromatic ring of phenyloxirane and (phenylmethyl)oxirane. The oxirane ring is then opened exclusively in the α-position. Two dimeric products, i.e. dipotassium 2,3-diphenylbutane-1,4-dioxide and dipotassium 1,3-diphenylbutane-1,4-dioxide are formed in the case of phenyloxirane. A mixture of several potassium
选自K的钾阴离子电子-,K +(15-冠-5)2(1)最初转到苯基环氧乙烷和(苯甲基)环氧乙烷的芳环。然后,环氧乙烷环仅在α位置打开。在苯基环氧乙烷的情况下,形成两个二聚产物,即2,3-二苯基丁烷-1,4-二氧化物二钾和1,3-二苯基丁烷-1,4-二氧化物二钾。在以下反应中得到几种烷氧基钾的混合物:3-苯基丙氧基,3-苯基烯丙氧基,四甘醇乙二醇酯乙烯基醚和合适的醇,即3-苯基-1-丙醇,3-苯基烯丙醇和四乙二醇乙烯基醚。1与(苯甲基)环氧乙烷一起。但是,第二个CH的介绍将2个基团取代成(2-苯乙基)环氧乙烷中环氧乙烷环的β-开环。在这种情况下,主要的反应产物是4-苯基丁烷-2-氧化物钾和四亚乙基乙醇酸钾乙烯基醚。有机金属中间体参与所有这些过程。