Monomeric metal alkoxides and trialkyl siloxides: (BDI)Mg(OtBu)(THF) and (BDI)Zn(OSiPh3)(THF). Comments on single site catalysts for ring-opening polymerization of lactides

Malcolm H. Chisholm; John C. Huffman; Khamphee Phomphrai

doi:10.1039/B008158M

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Monomeric metal alkoxides and trialkyl siloxides: (BDI)Mg(O^tBu)(THF) and (BDI)Zn(OSiPh₃)(THF). Comments on single site catalysts for ring-opening polymerization of lactides†

Malcolm H. Chisholm,*^a John C. Huffman^b and Khamphee Phomphrai^a

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* Corresponding authors

^a Department of Chemistry, the Ohio State University, Columbus, Ohio, USA

^b Molecular Structure Center, Indiana University, Bloomington, Indiana, USA

Abstract

The monomeric alkoxide (BDI)Mg(O^tBu)(THF) and triphenylsiloxide (BDI)Zn(OSiPh₃)(THF) have been prepared and characterized and shown to reversibly dissociate THF in solution on the NMR time scale; both compounds are active precursors for the ring-opening polymerization of lactide and the rate of polymerization is notably faster for the magnesium complex though in the polymerization of rac-lactide only the zinc complex shows selectivity for heterotactic tetrads.

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Article information

DOI: https://doi.org/10.1039/B008158M
Article type: Communication
Submitted: 10 Oct 2000
Accepted: 20 Dec 2000
First published: 15 Jan 2001

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J. Chem. Soc., Dalton Trans., 2001, 222-224

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Monomeric metal alkoxides and trialkyl siloxides: (BDI)Mg(O^tBu)(THF) and (BDI)Zn(OSiPh₃)(THF). Comments on single site catalysts for ring-opening polymerization of lactides

M. H. Chisholm, J. C. Huffman and K. Phomphrai, J. Chem. Soc., Dalton Trans., 2001, 222 DOI: 10.1039/B008158M

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Journal of the Chemical Society, Dalton Transactions