摘要配合物Re2X4(LL)2 [当LL = Ph2PCH2PPh2(dppm)时为X = Cl,当Ph2AsCH2AsPh2(dpam)为X = Br时)干净地转化为纯反式Re-(Re2(O2CR)2X2(LL)2)使它们在室温下与[(Ph3P)2N] O2CR(R =
CH3,
C2H5,
C6H4或4-
C5H4N)在
CH2Cl2中反应。当这些相同的反应在回流的
乙醇中进行时,当R = 或 时,会形成相关的顺式异构体。在Re2(O2CC6H5)2Cl2(dppm)2的情况下,会生成顺式和反式异构体的混合物,而对于Re2(O2C-4-py)2Cl2(dppm)2(4-py = 4- )再次产生。将反式-Re2(O2CR)2Cl2(dppm)2(R = 或 )在
乙醇中加热约3小时后,异构化为顺式-Re2(O2CR)2Cl2(dppm)2。通过X射线晶体学确定反式-Re