Substitution effect on phenalenyl backbone in the rate of organozinc catalyzed ROP of cyclic esters

Sen, Tamal K. ; Mukherjee, Arup ; Modak, Arghya ; Mandal, Swadhin K. ; Koley, Debasis (2013) Substitution effect on phenalenyl backbone in the rate of organozinc catalyzed ROP of cyclic esters Dalton Transactions, 42 (5). pp. 1893-1904. ISSN 1477-9226

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Official URL: http://doi.org/10.1039/C2DT32152A

Related URL: http://dx.doi.org/10.1039/C2DT32152A

Abstract

A series of zinc complexes (1–6) supported by substituted phenalenyl ligands was synthesized by reacting the phenalenyl ligands with diethyl zinc under ethane evolution. The solid state structures of these complexes (1–6) were determined by single crystal X-ray crystallography. Furthermore, the organozinc complexes (4–6) were tested for the polymerization of cyclic esters as efficient catalysts for the ring-opening polymerization of ε-caprolactone (ε-CL) and rac-lactide (rac-LA) in the presence of benzyl alcohol (BnOH) as initiator. Complex 4 exhibited remarkably higher rate of polymerization under identical reaction condition than complexes 5 and 6. The polymerization of ε-caprolactone produced polymer with narrow polydispersities (Mw/Mn = 1.06 to 1.22), while the polymerization of lactide monomers afforded polylactides with polydispersity values ranging from 1.08 to 1.8. The kinetic experiments unravelled a controlled polymerization. The controlled nature of polymerization was further utilized in the preparation of the block copolymer poly(CL)block-poly(rac-LA).

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ID Code:118348
Deposited On:20 May 2021 11:04
Last Modified:20 May 2021 11:04

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