Simple is best: Diamine zinc complexes as unexpected catalysts in lactide polymerisation
摘要:
A series of monomeric coordination compounds containing zinc(II) chloride or zinc(II) bromide and the 1,2-diamine ligands TMEDA, TEEDA, (R,R)-TMCDA, (R,R)-TECDA and cis-TMCDA have been synthesised and structurally characterised using X-ray diffraction analysis. All but one complex could be successfully used as initiators for the solvent-free ring-opening polymerisation of D,L-lactide. In particular, the polylactide (PLA) prepared with compounds containing (R,R)-TECDA is obtainable in high yields with molecular weights suitable for industrial applications. Thus a class of stable, easy to synthesise and efficient PLA catalysts with neutral ligands is introduced. (c) 2012 Elsevier Ltd. All rights reserved.
Synthesis of cis-TMCDA: Optimization and characterization of a key intermediate
摘要:
We report optimized synthetic procedures to cis-TMCDA and cis-cyclohexane-1,2-diamine. Our new two-step approach is an efficient and low-cost method for synthesizing the ligand cis-TMCDA. In the preparation of cis-cyclohexane-1,2-diamine, the crystallization of the unexpected intermediate cis-cyclohexane-1,2-diammonium hydrogensulfate ethylsulfate made the subsequent reactions easier in their workup, as nickel(II) chloride impurities were eliminated. (C) 2011 Elsevier B.V. All rights reserved.
Unexpected structural motifs in diamine coordination compounds with allyllithium
作者:Prisca K. Eckert、Barbara Schnura、Carsten Strohmann
DOI:10.1039/c3cc48873j
日期:——
New diamine coordination compounds with phenyllithium and allyllithium are presented. One of them is the first diamine complex containing two different, simple organolithium reagents. The formation of this unexpected compound is explained using quantum chemical calculations.
DISULFIDE COMPOUNDS FOR DELIVERY OF PHARMACEUTICAL AGENTS
申请人:Tufts University
公开号:EP2961733B1
公开(公告)日:2021-01-13
US9765022B2
申请人:——
公开号:US9765022B2
公开(公告)日:2017-09-19
Simple is best: Diamine zinc complexes as unexpected catalysts in lactide polymerisation
作者:Prisca K. Eckert、Ines dos Santos Vieira、Viktoria H. Gessner、Janna Börner、Carsten Strohmann、Sonja Herres-Pawlis
DOI:10.1016/j.poly.2012.09.012
日期:2013.1
A series of monomeric coordination compounds containing zinc(II) chloride or zinc(II) bromide and the 1,2-diamine ligands TMEDA, TEEDA, (R,R)-TMCDA, (R,R)-TECDA and cis-TMCDA have been synthesised and structurally characterised using X-ray diffraction analysis. All but one complex could be successfully used as initiators for the solvent-free ring-opening polymerisation of D,L-lactide. In particular, the polylactide (PLA) prepared with compounds containing (R,R)-TECDA is obtainable in high yields with molecular weights suitable for industrial applications. Thus a class of stable, easy to synthesise and efficient PLA catalysts with neutral ligands is introduced. (c) 2012 Elsevier Ltd. All rights reserved.
Synthesis of cis-TMCDA: Optimization and characterization of a key intermediate
作者:Prisca K. Eckert、Verena Schill、Carsten Strohmann
DOI:10.1016/j.ica.2011.06.008
日期:2011.10
We report optimized synthetic procedures to cis-TMCDA and cis-cyclohexane-1,2-diamine. Our new two-step approach is an efficient and low-cost method for synthesizing the ligand cis-TMCDA. In the preparation of cis-cyclohexane-1,2-diamine, the crystallization of the unexpected intermediate cis-cyclohexane-1,2-diammonium hydrogensulfate ethylsulfate made the subsequent reactions easier in their workup, as nickel(II) chloride impurities were eliminated. (C) 2011 Elsevier B.V. All rights reserved.