Synthesis and structure of 2,2′-biphosphirenes
Abstract
The reaction of an excess of the transient terminal phosphinidene complex [PhP→W(CO)5] with selected 1,3-diynes at 110 °C in toluene affords the corresponding 2,2′-biphosphirene–W2(CO)10 complexes as a 1∶1 meso + rac mixture; according to the X-ray crystal structure analysis of one of the rac-complexes, some delocalisation takes place within the diene sub-unit of these biphosphirenes.