An unexpected synthesis of vinyl trifluoromethyl thioethers from epoxides has been described. Treatment of epoxides with AgSCF3 in the presence of n-Bu4NI and KI in toluene afforded various vinyl trifluoromethyl thioethers in moderate to good yields. The use of easily available substrates and tolerance of wide functional groups are the notable advantages of this protocol.
A resin composition is provided which comprises (A) 100 parts by weight of an ABS graft copolymer composed of an acrylonitrile compound and a vinyl aromatic compound in a weight ratio of 10:90 to 50:50, and (B) 5 to 30 parts by weight of an ethylene oxide copolymer admixed with the ABS graft copolymer and containing at least 50 wt. % of ethylene oxide, the ethylene oxide copolymer having a refractive index (nD²⁰) of at least 1.50. The composition, which has antistatic properties, is useful for injection molding to give moldings having an excellent surface appearance.
Quaternary Alkyl Ammonium Salt-Catalyzed Transformation of Glycidol to Glycidyl Esters by Transesterification of Methyl Esters
作者:Shinji Tanaka、Takuya Nakashima、Toshie Maeda、Manussada Ratanasak、Jun-ya Hasegawa、Yoshihiro Kon、Masanori Tamura、Kazuhiko Sato
DOI:10.1021/acscatal.7b03303
日期:2018.2.2
ring-opening reaction of the epoxide. Computational studies of the reaction mechanism indicated that the alkoxide anion derived from glycidol tends to abstract the proton of another glycidol rather than work as a nucleophile, initiating the catalytic transesterification. Payne rearrangement of the deprotonated glycidol, which produces a destabilized base that promotes nonselective reactions, is energetically
The synthesis of densely functionalised α-acyloxy enaminals and enaminones<i>via</i>a novel homogeneous silver(<scp>i</scp>) catalysed rearrangement
作者:Kunal Keskar、Carlos Zepeda-Velazquez、Chanti Babu Dokuburra、Hilary A. Jenkins、James McNulty
DOI:10.1039/c9cc05614a
日期:——
A synthesis of densely functionalised α-acyloxy enaminals and enaminones via a novel homogeneous silver(I) catalyzed rearrangement of 1-acyloxy-3-azido ketones is reported. This silver catalyzed reaction involves an internal redox process comprised of four net transformations: loss of nitrogen, reductive cleavage of the azide, 1,2-acyl migration and oxidation of the acyloxy position to an aldehyde