Lithium bis(ethylenedioxyboryl)methide and its reactions with carbonyl compounds and with the chlorotriphenyl derivatives of germanium, tin and lead
作者:Donald S. Matteson、Pradipta K. Jesthi
DOI:10.1016/s0022-328x(00)90155-4
日期:1976.4
Transesterification of tris(dimethoxyboryl)methane, HC[B(OCH3)2]3, with ethylene glycol yielded tris(ethylenedioxyboryl)methane (I), HC(BO2C2H4)3 which with methyllithium in THF at −70°C precipitated lithium bis(ethylenedioxyboryl)methide (II), Li+ HC(BO2C2H4)2-. Reaction of II with Ph3MCl, where M = Ge, Sn, or Pb, gave Ph3MCH(BO2C2H4)2. The analogous 1,3-propanediol ester, Li+HC(BO2C3H6)2-, yielded
三(二甲氧基硼基)甲烷HC [B(OCH 3)2 ] 3与乙二醇的酯交换反应生成三(乙二氧基硼基)甲烷(I)HC(BO 2 C 2 H 4)3,其与甲基锂在THF中于-70 ℃下沉淀的锂双(ethylenedioxyboryl)甲基化物(II)中,Li + HC(BO 2 ç 2 ħ 4)2 - 。II与Ph 3 MCl反应,其中M = Ge,Sn或Pb,得到Ph 3 MCH(BO 2 C 2 H 4)2。类似的1,3-丙二醇酯,栗+ HC(BO 2 ç 3 ħ 6)2 - ,得到博士3 MCH(BO 2 ç 3 ħ 6)2。用MeLi处理然后用Ph 3 SnCl处理Ph 3 SnCH(BO 2 C 2 H 4)2得到(Ph 3 Sn)2 CHBO 2 C 2 H 4,表明一个B和一个Sn原子足以稳定碳负离子。II与醛的反应可得到高产率的1-烯烃-1-硼酸酯RCHBOCHBO 2 C 2 H