作者:Joyce C. Corey、Christy S. John、Martha C. Ohmsted、Lihsueh S. Chang
DOI:10.1016/s0022-328x(00)99678-5
日期:1986.4
OR), and bifunctional derivatives, (IV, X Cl; V, X OR) were determined. Controlled halogenation of I to II was accomplished with one molar equivalent of SO2Cl2 or NBS although CCl4 in the presence of ClRh(PPh3)3 or PdCl2 results in slow monochlorination. The reaction of I with excess SOCl2 or SO2Cl2 converts I to III but the latter is faster and provides fewer side reactions. Conversion of I to IV
所述diorganometallic试剂缩合(ø -MC 6 ħ 4)2 X(M锂,氯化镁)与HSiCl 3,接着用还原的LiAlH 4提供dibenzosilacycles,I(A,X - ; B,XNME; C, X = CH 2; d,X = CH 2 CH 2),带有两个环外H-取代基。确定了将I逐步转化为混合双官能体系(II,XCl,Br; III,X)OR)和双官能衍生物(IV,XCl; V,XOR)的条件。尽管CCl 4为1摩尔当量的SO 2 Cl 2或NBS可实现I至II的受控卤化在ClRh(PPh 3)3或PdCl 2的存在下导致缓慢的单氯化作用。I与过量的SOCl 2或SO 2 Cl 2的反应将I转化为III,但是后者更快并且提供更少的副反应。用ClRh(PPh 3)3高产率地将I与IV转化为IV,而使用H 2 PtCl 6则低产率地进行I至IV的转化。除t