Methyl/ethyl differentiation in diastereoselective hydride addition to [Tp'W(CO)(PhCCMe)(NH=CMeEt)][BAr'(4)].
Hydride addition to either an 80:20 or a 93:7 E/Z isomer ratio of coordinated imine complex 2a occurs with high diastereoselectivity. The high diastereoselectivity regardless of the reagent E/Z ratio is explained by a difference between the relative kinetic acidities of the E and Z isomers of the imine complex. The kinetic acidities of related isopropylimine and 3-pentylimine complexes were used in explaining these results.
Vogeley
Neil J
NJ
Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, USA.
White
Peter S
PS
Templeton
Joseph L
JL