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.
N. Hoa Tran Huy, L. Ricard and F. Mathey, J. Chem. Soc., Dalton Trans., 1999, 2409 DOI: 10.1039/A904150H
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