Synthesis and Structure of [trans-{1,2-Bis(κ²-O,O-N- phenylcarbamoyl)cyclopentadienylbis(thf)}magnesium]·4thf

The reaction of magnesocene, Cp₂Mg, with phenylisocyanate (1:4 equivalents) in thf solvent affords [trans-{1,2-bis(N-phenylcarbamoyl)cyclopentadienylbis(thf)}magnesium]·4thf (1·4thf), the structure of which has been determined by single-crystal X-ray diffraction. The structure of 1·4thf provides evidence for a metal tethering effect in the 1,2-selective formation of other bis-carbamoyl ligands similar to that reported in this work.