STEREOSPECIFIC AND CHEMOSPECIFIC INTERCONVERSIONS OF THE RHENIUM ALKYLIDENE [(ETA-C5H5)RE(NO)(PPH3)(CHC6H5)]+PF6- AND THE ALKYLRHENIUM (ETA-C5H5)RE(NO)(PPH3)(CH(OCH3)C6H5)
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abstract
Addition of methoxide to either geometric isomer of the benzylidene complex [(-C5H5)Re(NO)(PPh3)(CHC6H5)]+PF6- (1t, 1k) affords (-C5H5)Re(NO)(PPh3)(CH(OCH3)C6H5 (2t, 2k) in which a new chiral center has been generated stereospecifically or with high stereoselectivity. Reaction of 2t and 2k with Ph3C+PF6- results in the chemospecific abstraction of a methoxy group and the stereospecific regeneration of 1t and 1k, respectively. 1980.
