Synthesis and Properties of a Strained Germacycle Having a Ge−Ge Bond, 3,4-Benzo-1,1,2,2-tetraethyl-1,2-digermacyclobut-3-ene
作者:Haruhiko Komoriya、Masahiro Kako、Yasuhiro Nakadaira、Kunio Mochida
DOI:10.1021/om9509150
日期:1996.4.16
A new strained germacycle, 3,4-benzo-1,1,2,2-tetraethyl-1,2-digermacyclobut-3-ene (1), was prepared by treatment of 1,2-bis(chlorodiethylgermyl)benzene with sodium in toluene. At ambient temperature, 1 was gradually oxidized in air to give 3,4-benzo-1,3-digerma-2-oxacyclopent-4-ene (2), and in the presence of sulfur, 1 was converted to 3,4-benzo-1,3-digerma-2-thiacyclopent-4-ene (3), quantitatively
通过用钠处理1,2-双(氯二乙基锗基)苯制备了一种新的应变生殖环,3,4-苯并-1,1,2,2-四乙基-1,2-二茂铁环丁-3-烯(1)在甲苯中。在环境温度下,1在空气中逐渐氧化,得到3,4-苯并-1,3-二茂基-2-氧杂环戊-4-烯(2),在硫的存在下,1转化为3,4-在相似的热条件下定量地测定苯并1,3-二聚体-2-硫代环戊-4-烯(3)。双亚甲基环丁烯1具有热稳定性,易于在甲苯中进行开环聚合反应,得到相应的聚合物4(M n = 4.4×10 5,M w= 7.4×10 5,M w / M n= 1.7)。在160°C下热解20小时后,1产生了两种产物,即4,5-苯并-1,2,3-三茂基环戊-4-烯(5)和3,4:6,7-二苯并-1,2, 5-trigermacyclohepta-3,6-diene(6),产率合理。另一方面,在苯乙炔的存在下热解1定量地得到了2,3-苯并-1,4-二茂