Studies on organogermanium heterocycles and related compounds
作者:N.K. Hota、C.J. Willis
DOI:10.1016/s0022-328x(00)86327-5
日期:1968.11
Attempts to synthesize fluorinated heterocycles containing germanium are described. 1,1-Dimethyl-2,3,4,5-tetraphenyl-1-germacyclopentadiene has been prepared, but did not undergo simple Diels-Alder addition to various acetylenes to give isolable germanorbornadienes. The analogous silicon heterocycle underwent ready addition to hexafluoro-2-butyne to give the trifluoromethyl-substituted silanorbornadiene
Treatment of various fluorinated internal alkynes with 10 mol% of RhCl3·H2O and 30 mol% of i-Pr2NEt in toluene at the reflux temperature for 18 h gave the corresponding trimerization products as an isomeric mixture in high yields. Cycloaddition using 1.0 equiv. of fluorinated alkynes and 2.0 equiv. of non-fluorinated alkynes under the same reaction conditions as in the trimerization led to mono- and