different GeGe bond lengths. However, while 5 crystallizes as a racemate, 6 forms a conglomerate of enantiomerically pure crystals. The X-ray structure analysis of the 1,3-dimethyltrigermane (7) derivative, derived from 6 by a sequence of metalation and methylation reactions, reveals more symmetrical molecules of the point group C2 which also crystallize as a racemate. Irradiation of 3 leads to tetra-tert-butyldigermene
用CCl 4,Br 2和I 2处理六叔丁基环trigermane(3)可得到相应取代的1,3-二
氯-(4),1,3- dibromo-(5)和1,3-二
碘代trigermanes (6)。5和6分子的对称性非常相似(点组C 1),显示了反构象构型和不同的GeGe键长。但是,虽然5结晶为消旋体,但6形成对映体纯晶体的聚集体。通过一系列
金属化和甲基化反应从6衍生的1,3-二甲基trigermane(7)衍
生物的X射线结构分析显示,对称的C 2点组分子也结晶为外消旋物。照射3所导致四-叔-butyldigermene(8)和二-叔-butylgermylene(9),其可以通过用
硒,
碲加成和环加成反应被捕获,和3,5-二-叔丁基-1,2- -苯醌。