Synthesis of New Chiral Ligands and Their Group VI Metal Alkylidene Complexes
Abstract
The new chelating chiral diol ligands (1S,2S)- and (1R,2R)-1,2-bis(2-hydroxy-2,2-bis(trifluoromethyl)ethyl)cyclopentane (TBEC-H_2; 1) were synthesized. The dilithium alkoxide of TBEC was reacted with Mo(CHCMe_2Ph)(NAr)(OTf)_2dme (2; Ar = 2,6-(i-Pr)_2C_6H_3) to give the chiral alkylidene complex Mo(CHCMe_2Ph)(NAr)(TBEC) (3). The ligand also reacts with W(η^2-diphenylcyclopropene)Cl_2(O)[P(OMe)_3]_2 (4), W(CHCHCOCH2CH2CH2O)(O)Cl_2[P(OMe)_3] (5), and W(CHCHCPh_2)(NAr)Cl_2[P(OMe)_3]_2 (6; Ar = 2,6-(i-Pr)_2C_6H_3) to the give stable corresponding tungsten oxo vinylalkylidene complexes and tungsten amide vinylalkylidene complexes, respectively. These group VI alkylidene complexes show excellent catalytic activity in both ring-opening metathesis polymerization and in ring-closing metathesis processes.
Additional Information
© 1996 American Chemical Society. Received September 11, 1995. Support has been provided by Ube Industries, Ltd. of Japan (grant to O.F.), the Ministerio de Educacion y Ciencia of Spain (grant to F.J.M.), and the National Institutes of Health (grant to R.H.G.). We thank Dr. Jerome P. Claverie for helpful discussions.Additional details
- Eprint ID
- 86481
- DOI
- 10.1021/om950724x
- Resolver ID
- CaltechAUTHORS:20180518-162952014
- Ube Industries, Ltd.
- Ministerio de Educación y Ciencia (MEC)
- NIH
- Created
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2018-05-21Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field