The compounds, 3α- and 3β-triphenylstannylcholest-5-ene, 1 and 2 respectively, have been prepared stereospecifically in reactions of Ph3SnLi with cholesteryl methane- or toluene-p-sulfonates, and of Ph3SnCl with the Grignard reagent from cholesteryl chloride, respectively. Complete 1H and 13C NMR spectral assignments for 1 have been obtained using HMBC and HMQC techniques: these have been used to aid
化合物3α-和3β-三苯基
锡烷基胆甾烯5-烯1和2分别是在Ph 3 SnLi与
胆甾醇甲烷或
甲苯-对-
磺酸盐和Ph 3 SnCl与Grignard试剂的反应中立体定向制备的。
胆固醇氯化物。使用HMBC和HMQC技术获得了1的完整1 H和13 C NMR光谱分配:这些用于辅助2和3α-和3β-(I n Ph 3- n Sn)最强的13 C NMR光谱分配-5-烯(n = 1-2)(9-12)。3α-(IPh 2 Sn)胆甾-5-烯9和3α-(I的晶体结构测定2 PhSn)cholest-5-ene 10表示两种化合物中
锡中心周围的扭曲的四面体几何形状。Sn–I键长在9中为2.731(5)Å,在10中为2.6979(12)至2.7173(12)Å,尽管二面角的值(大约60°)相似,Sn–C( 3)–C(2)–C(1)[C(1)脂族碳]和Sn–C(3)–C(4)–C(5)[C(5)烯烃碳],值3