Organometallic conformational equilbria : XVI. Steric effects on π-allyl and π-indenyl orientation in molybdenum and tungsten complexes

摘要: Abstract Steric effects on π-allyl and π-indenyl orientation in molybdenum tungsten complexes have been studied. Magnetic anistropies associated with indenyl derivatives provided a definitive technique for determination of stereochemistry these complexes. The steric factors which determine the stability orientations allyl moiety discussed. Generally π-cycloentadienyl or ligands considered to be essentially freely rotating. Analysis magnitude magnetic anisotropy arising from benzene ring has suggested that there is relatively free rotation ligands, but preferred conformation six-membered oriented over allyl. Appropriate substitution offers sufficient hindrance make other conformations more probable.