OPTICALLY ACTIVE BISMUTH HETEROBIMETALLIC COMPLEXES CONTAINING ALKALI METAL-CAPPED BINAPHTHOXIDE LIGATION
Journal Title: Journal of Science And Arts - Year 2011, Vol 15, Issue 2
Abstract
The reaction of monometallated (Li, Na, K) (R)-2,2’-dihydroxy-1,1’-binaphthyl (BINOL) with [Bi(OBut)3] affords optically pure bismuth tris(binaphthoxides) with three capping Group I counterions. The stable monomeric complexes have been characterised in solution and the solid state and exhibit structural features similar to previously reported lanthanide analogues. The solution and solid state analysis are reported as well as the catalytic application of the complexes to an asymmetric Michael addition reaction. NMR analysis suggests the octahedral structure is maintained in solution, and the moderate stability of the complexes in the solid state allows for handling under ambient conditions without significant decomposition. The title complexes effectively catalyze the Michael addition of dimethyl malonate to cylohexenone, albeit with minimal chiral induction.
Authors and Affiliations
LUKE TURNER, MATTHEW DAVIDSON, AMANDA CHMURA
Keywords
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