MECHANISM OF COUPLING OF equals CH2 TO H2C equals CH2 AT A HOMOGENEOUS ( eta -C5H5)Re(NO)(PPH3) + CENTER. REMARKABLE ENANTIOMER SELF-RECOGNITION.

Article abstract of DOI:10.1021/ja00356a019

The methylidene complex couples to the ethylene complex at 273-308 K in CH//2Cl//2. The rate of coupling is second order in 1 and not affected by the presence of 5-10 equiv of RCN. Data collected from 273 to 308 K give numerical results. Crossover experiments show that no PPh//3 dissociation or intermolecular methylidene scrambling occurs prior to the rate-determining coupling step, and that the RR and SS transition states are greatly preferred over the RS transition state (enantiomer self-recognition). 84 refs.