Mechanism of equilibration of diastereomeric chiral rhenium alkene complexes of the formula [(.eta.5-C5H5)Re(NO)(PPh3)(H2C:CHR)]+BF4-. The metal traverses between alkene enantiofaces without dissociation!
Tang Sheng Peng and J. A. Gladysz
JACS 1992, 114, 4174 - 4181
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http://dx.doi.org/10.1021/ja00037a020