Regioselective and Alternating Copolymerization of Carbonyl Sulfide with Racemic Propylene Oxide
作者:Ming Luo、Xing-Hong Zhang、Bin-Yang Du、Qi Wang、Zhi-Qiang Fan
DOI:10.1021/ma401114m
日期:2013.8.13
We report the first example of a regioregular and fully alternating poly (propylene monothiocarbonate) (PPMTC) from the well-controlled copolymerization of two asymmetric monomers, carbonyl sulfide and racemic propylene oxide, using (Salen)CrCl in conjunction with bis(triphenylphosphoranylidene)ammonium chloride. The maximum turnover of frequency of this catalyst system was 332 h(-1) at 25 degrees C. The contents of monothiocarbonate and tail-to-head linkages of PPMTC were up to 100% (based on H-1 NMR spectra) and 99.0% (based on C-13 NMR spectra), respectively. PPMTC samples have number-average molecular weight (M-n) up to 25.3 kg/mol with polydispersity index of 1.41. The very low decomposition temperature of 137 degrees C and high refractive index of 1.63 of PPMTC make it a potential scarifying optical adhesive.
Synthesis of cyclic monothiocarbonates via the coupling reaction of carbonyl sulfide (COS) with epoxides
作者:M. Luo、X.-H. Zhang、D. J. Darensbourg
DOI:10.1039/c5cy00977d
日期:——
for the synthesis of cyclic monothiocarbonates via the coupling reaction of carbonyl sulfide (COS) and epoxides. The systems proved to be efficient single-component, metal-free catalysts for the reaction of simple (propylene oxide, 1,3-butene oxide) or activated epoxides (epichlorohydrin, glycidyl phenyl ether) with COS under solvent-free and mild reaction conditions to selectively afford the corresponding