Abstract
Reaction of chlorodifluorophosphine with aryllithium compounds has been found to furnish aryldifluorophosphines. This type of reaction is applicable to any aromatic system for which a regioselective lithiation is possible. The most stable products are those in which the PF 2 group is protected by two neighbouring groups, in the 2- and 6- position of an aromatic ring. The 19F- and 31P- n.m.r. spectra of the aryldifluorophosphines are presented and discussed. Evidence for several lines of spontaneous transformation of aryldifluorophosphines has been obtained: (i) scrambling reaction with formation of bis-aryl-fluorophosphines and phosphorus trifluoride, and (ii) redox disproportionation with formation of aryltetrafluorophosphoranes and cyclopolyphosphines, respectively. In both cases, the underlying reaction mechanism seems to be similar in nature. A number of cis-dichloro-bis-(aryldifluorophosphine) platinum(II) complexes, involving the new difluorophosphines, have been prepared. The 19F- and 31P - n.m.r. spectra of these complexes are discussed in relation to those of the uncoordinated ligands. Also, the fragmentation pathway of the platinum(II) complexes in their mass spectra has been deduced and is discussed.
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