Jiang, Xiao; Zhao, Na; Li, Zhibo published the artcile< Stereoselective Ring-Opening Polymerization of rac-Lactide Catalyzed by Squaramide Derived Organocatalysts at Room Temperature>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is lactide stereoselective squaramide organocatalyst ring opening polymerization.
Substantial progresses have been made toward the development of metal-free catalysts for stereoselective ring-opening polymerization (ROP) of rac-lactide. Yet the discovery of organic catalysts effective at ambient temperature remains a major challenge. Here, the bifunctional H-bonding catalyst SQ-1 containing a basic tertiary amine and squaramide motif proved to be good candidate for the stereoselective ROP of rac-lactide at room temperature, yielding stereoregular polylactide with controlled mol. weights (up to 21.1 kg/mol) and high tacticity (PiESC up to 0.88). Furthermore, binary H-bonding catalytic system consisting of squaramides (SQ-2 to SQ-6) and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) could efficiently promote the ROP of rac-lactide at room temperature within short reaction time. Among them, the most bulky squaramide SQ-2 exhibited the best stereoselectivity towards the ROP of rac-lactide without transesterification side reactions during the polymerization process. The resulting polylactides were proved to have controlled mol. weights as high as 22.2 kg/mol and narrow distributions (1.10-1.24).
Chinese Journal of Chemistry published new progress about Glass transition temperature. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate.
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics