Phosphazene Bases: A New Category of Organocatalysts for the Living Ring-Opening Polymerization of Cyclic Esters
MacromoleculesPublished 19 May 2007
Lei Zhang, Fredrik Nederberg, Russell C. Pratt, Robert M. Waymouth, James L. Hedrick, Charles G. Wade
Citations259
SJR quartileQ1
SJR score1.35
SNIP1.22
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Abstract
We demonstrate that phosphazene bases, such as 2- tert -butylimino-2-diethylamino-1,3-dimethylperhydro-1,3,2-diazaphosphorine (BEMP) and N ‘- tert -butyl- N,N, N ‘, N ‘, N ‘ ‘, N ‘ ‘-hexamethylphosphorimidic triamide (P 1 - t -Bu), are active organocatalysts for the living ring-opening polymerization (ROP) of cyclic esters. Polyesters prepared through this organocatalytic route possess predictable molecular weights, narrow polydispersities, and high end-group fidelity. Mechanistic studies suggest that the intermolecular hydrogen bonding of the alcohol initiator to phosphazene bases activates the alcohol for ROP of cyclic esters.
Keywords
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