AN ALUMINUM SILOXIDE COMPLEX FOR STEREOSELECTIVE POLYMERIZATION OF RACEMIC LACTIDE

Stereoselective polymerization of lactide is receiving growing attention in polymer science. Herein, a five-coordinate aluminum siloxide complex, [2,2-dimethyl-1,3-propylenebis(3,5-di-tert- butylsalicylideneiminato)] (triphenyl-silanolato) aluminium (III) (1), was prepared from AlEt3, N,N'-(2,2...

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Autores principales:	ZHANG,YU, PANG,XUAN, MA,LILI, TANG,ZHAOHUI
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2017
Materias:	aluminum siloxide catalyst lactide stereoselective polymerization
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072017000200009
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spelling	oai:scielo:S0717-970720170002000092017-06-30AN ALUMINUM SILOXIDE COMPLEX FOR STEREOSELECTIVE POLYMERIZATION OF RACEMIC LACTIDEZHANG,YUPANG,XUANMA,LILITANG,ZHAOHUI aluminum siloxide catalyst lactide stereoselective polymerization Stereoselective polymerization of lactide is receiving growing attention in polymer science. Herein, a five-coordinate aluminum siloxide complex, [2,2-dimethyl-1,3-propylenebis(3,5-di-tert- butylsalicylideneiminato)] (triphenyl-silanolato) aluminium (III) (1), was prepared from AlEt3, N,N'-(2,2-dimethylpropylene) bis(3,5-di-tert-butylsalicylideneimine) and triphenyl-silanol. X-ray analysis demonstrated that 1 contained a five-coordinate aluminum atom with distorted trigonal bipyramidal geometry in the solid state. ¹H NMR and 13C NMR spectra indicated that the two conformational stereoisomers of 1 tautomerizes rapidly in chloroform or toluene solution at room temperature. 1 showed high stereoselectivity (Pm = 0.84) for the ROP of rac-lactide in toluene at 100°C, and polymerized rac-lactide to crystalline polymer (Tm = 178°C). This is the first report of stereoselective polymerization of rac-lactide using aluminum siloxide as a catalyst.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.62 n.2 20172017-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072017000200009en10.4067/S0717-97072017000200009
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	aluminum siloxide catalyst lactide stereoselective polymerization
spellingShingle	aluminum siloxide catalyst lactide stereoselective polymerization ZHANG,YU PANG,XUAN MA,LILI TANG,ZHAOHUI AN ALUMINUM SILOXIDE COMPLEX FOR STEREOSELECTIVE POLYMERIZATION OF RACEMIC LACTIDE
description	Stereoselective polymerization of lactide is receiving growing attention in polymer science. Herein, a five-coordinate aluminum siloxide complex, [2,2-dimethyl-1,3-propylenebis(3,5-di-tert- butylsalicylideneiminato)] (triphenyl-silanolato) aluminium (III) (1), was prepared from AlEt3, N,N'-(2,2-dimethylpropylene) bis(3,5-di-tert-butylsalicylideneimine) and triphenyl-silanol. X-ray analysis demonstrated that 1 contained a five-coordinate aluminum atom with distorted trigonal bipyramidal geometry in the solid state. ¹H NMR and 13C NMR spectra indicated that the two conformational stereoisomers of 1 tautomerizes rapidly in chloroform or toluene solution at room temperature. 1 showed high stereoselectivity (Pm = 0.84) for the ROP of rac-lactide in toluene at 100°C, and polymerized rac-lactide to crystalline polymer (Tm = 178°C). This is the first report of stereoselective polymerization of rac-lactide using aluminum siloxide as a catalyst.
author	ZHANG,YU PANG,XUAN MA,LILI TANG,ZHAOHUI
author_facet	ZHANG,YU PANG,XUAN MA,LILI TANG,ZHAOHUI
author_sort	ZHANG,YU
title	AN ALUMINUM SILOXIDE COMPLEX FOR STEREOSELECTIVE POLYMERIZATION OF RACEMIC LACTIDE
title_short	AN ALUMINUM SILOXIDE COMPLEX FOR STEREOSELECTIVE POLYMERIZATION OF RACEMIC LACTIDE
title_full	AN ALUMINUM SILOXIDE COMPLEX FOR STEREOSELECTIVE POLYMERIZATION OF RACEMIC LACTIDE
title_fullStr	AN ALUMINUM SILOXIDE COMPLEX FOR STEREOSELECTIVE POLYMERIZATION OF RACEMIC LACTIDE
title_full_unstemmed	AN ALUMINUM SILOXIDE COMPLEX FOR STEREOSELECTIVE POLYMERIZATION OF RACEMIC LACTIDE
title_sort	aluminum siloxide complex for stereoselective polymerization of racemic lactide
publisher	Sociedad Chilena de Química
publishDate	2017
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072017000200009
work_keys_str_mv	AT zhangyu analuminumsiloxidecomplexforstereoselectivepolymerizationofracemiclactide AT pangxuan analuminumsiloxidecomplexforstereoselectivepolymerizationofracemiclactide AT malili analuminumsiloxidecomplexforstereoselectivepolymerizationofracemiclactide AT tangzhaohui analuminumsiloxidecomplexforstereoselectivepolymerizationofracemiclactide AT zhangyu aluminumsiloxidecomplexforstereoselectivepolymerizationofracemiclactide AT pangxuan aluminumsiloxidecomplexforstereoselectivepolymerizationofracemiclactide AT malili aluminumsiloxidecomplexforstereoselectivepolymerizationofracemiclactide AT tangzhaohui aluminumsiloxidecomplexforstereoselectivepolymerizationofracemiclactide
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AN ALUMINUM SILOXIDE COMPLEX FOR STEREOSELECTIVE POLYMERIZATION OF RACEMIC LACTIDE

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