A switchable and benign protocol for chemoselectivesynthesis of sulfoxides and α-alkoxy-β-ketothioethers has been developed. It was determined that various thiophenols and alkenes/alkynes are compatible to realize the target compounds from a medium to a high yield by regulating the reaction temperature. In particular, methanol not only served as a solvent but also participated in the reaction process
Visible-light-activated selective synthesis of sulfoxides via thiol-ene/oxidation reaction cascade
作者:Manjula Singh、Arvind K. Yadav、Lal Dhar S. Yadav、R.K.P. Singh
DOI:10.1016/j.tetlet.2017.12.066
日期:2018.1
A convenient, highly selective and metal-free synthesis of sulfoxides from alkenes and thiols using NHPI as an inexpensive and reusable organophotoredox catalyst is reported. The protocol involves radical thiol-ene/oxidation reaction cascade and utilizes visiblelight and air (O2) as inexpensive, readily available, non-toxic and eco-sustainable reagents to afford up to 96% yields of the product at
Acid-Catalyzed Oxidative Addition of Thiols to Olefins and Alkynes for a One-Pot Entry to Sulfoxides
作者:Martin Klussmann、Hui-Lan Yue
DOI:10.1055/s-0035-1562480
日期:——
An oxidative variant of the thiol-ene reaction has been developed, achieving the direct addition of thiols to olefins to form sulfoxides. The reaction uses tert-butyl hydroperoxide as oxidant and methanesulfonic acid as catalyst. The latter is believed to catalyze the oxidation of the intermediate sulfide to the sulfoxide. No special precautions are necessary to exclude oxygen, yet the products are
Visible-light-induced selective synthesis of sulfoxides from alkenes and thiols using air as the oxidant
作者:Huanhuan Cui、Wei Wei、Daoshan Yang、Yulong Zhang、Huijuan Zhao、Leilei Wang、Hua Wang
DOI:10.1039/c7gc01416c
日期:——
A highly selective synthesis of sulfoxides from alkenes and thiols was established by visible-light photoredox catalysis at room temperature. This metal-free transformation protocol, which uses inexpensive Rose Bengal as the photocatalyst and air as the green oxidant, opens a new door toward the facile and practical construction of sulfoxides.
A thermoplastic resin composition comprising:
a transparent aromatic thermoplastic resin (a) and
a copolyester resin (b) comprising at least two kinds of dicarboxylic acid moieties and one kind of diol moiety, 1 to 50 mol % of the dicarboxylic acid moieties being a naphthalenedicarboxylic acid moiety,
the ratio of (a) to the combined amount of (a) and (b) being 55 to 99.99% by weight, and the ratio of (b) being 0.01 to 45% by weight.