η³−η⁵Interconversion vs Weak Bonding Interactions in Neutral Molybdenum(II) Complexes

Abstract

In a set of structurally related Mo(II) π-allyl complexes with a conjugated double bond appended to the allyl group, a weak bonding interaction such as B−H−Mo or C−H−Mo appears to prevent η3 to η5 interconversion. Structural assignments are made on the basis of NMR data, and crystal structure solutions are carried out for two of the complexes.