Structural and catalytic properties of bis(guanidine)copper(I) halides.
The neutral, bicyclic guanidine 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine (hppH) coordinates to Cu(I) halides via the imine nitrogen, and the complexes are stabilized by intramolecular NH...X interactions (X = Cl, Br) or are partially dissociated (X = I) in the solid state; in all cases, fluxional behavior is observed in solution. Selected complexes have been tested as catalysts for the polymerization of methyl methacrylate.
Oakley
Sarah H
SH
Department of Chemistry, University of Sussex, Falmer, Brighton BN1-9QJ, U.K.
Coles
Martyn P
MP
Hitchcock
Peter B
PB