摘要:
                                Reaction of Ni(dppe)Cl-2 (dppe = bis(diphenylphosphino)ethane) with organodichalcogenide ligands of the type 1,2-HSC6H4EH (E = CO2, O, NH) in the presence of triethylamine to give the products Ni(dppe)(SC6H4CO2) (1), Ni(dppe)(SC6H4O) (2), and Ni(dppe)(SC6H4NH) (3). Complex 2 was characterised by single crystal X-ray diffraction, which shows a distorted geometry. Complexes 1-3 and the dithiolato analogues of 1,2-benzenedithiol, Ni(dppe)(SC6H4S) (4), and 3,4-toluendithiol, Ni(dppe)(SC6H3MeS) (5), upon reflux with dimethylacetylenedicarboxylate (DMAD) formed the cyclotrimeric product hexamethylbenzene hexacarboxylate (HMBC). (C) 1998 Elsevier Science Ltd. All rights reserved.