Chiral 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD)-Catalyzed Stereoselective Ring-Opening Polymerization of rac-Lactide: High Reactivity for Isotactic Enriched Polylactides (PLAs)

Autor:	Qaiser Mahmood, Guangqiang Xu, Li Zhou, Xuanhua Guo, Qinggang Wang
Jazyk:	angličtina
Rok vydání:	2020
Předmět:	chiral TBD organocatalyst ring-opening polymerization high reactivity stereoselectivity Organic chemistry QD241-441
Zdroj:	Polymers, Vol 12, Iss 10, p 2365 (2020)
Druh dokumentu:	article
ISSN:	2073-4360
DOI:	10.3390/polym12102365
Popis:	Chiral 4,8-diphenyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene (DiPh-TBD) was synthesized and applied to a ring-opening polymerization of rac-lactide (rac-LA). The chiral DiPh-TBD promoted the synthesis of isotactic enriched polylactides (PLAs) with controlled molecular weight and narrow molecular weight distributions under mild, metal-free conditions. When the [rac-LA]/[Cat.] ratio was 100/1, full monomer conversion was achieved within only 1 min and a moderate probability of 0.67 meso dyads (Pm) was obtained at room temperature. A chain-end control mechanism (CEC) was found to be responsible for the isoselectivity based on the homodecoupled 1H NMR spectrum, the chiral HPLC measurement, and kinetic studies.
Databáze:	Directory of Open Access Journals
Externí odkaz:	https://doaj.org/article/c1eee2183885464386dba8cde11d33f3 Zobrazit plný text záznamu View record in DOAJ Plný text ve formátu PDF Plný text ve formátu HTML
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