Palladium-Catalyzed α-Arylation of Methyl Sulfonamides with Aryl Chlorides
作者:Bing Zheng、Minyan Li、Gui Gao、Yuying He、Patrick J. Walsh
DOI:10.1002/adsc.201600090
日期:2016.6.30
A palladium‐catalyzedα‐arylation of sulfonamides with aryl chlorides is presented. A Buchwald‐type pre‐catalyst formed with Kwong’s indole‐based ligand enabled this transformation to be compatible with a large variety of methyl sulfonamides and aryl chlorides in good to excellent yields. Importantly, under the optimized reaction conditions, only mono‐arylated products were observed. This method has
or Michael acceptors, thioacetates were prepared in situ and further treated with t-BuOCl, affording the corresponding sulfonyl chlorides which were trapped with nucleophiles such as water, alcohol, or amines. The three steps can be achieved in a one-pot procedure. Oxidative deprotection also proved to be efficient with S-trityl and S-tert-butyl groups, making it a convenient route toward cysteic acid
Verwendung von Polyurethanmischungen als Klebstoffe
申请人:BAYER AG
公开号:EP0335182A2
公开(公告)日:1989-10-04
Mischungen, die neben einem Polyurethan ein Phenol und/oder ein Säureamid und gegebenenfalls ein Polyisocyanat aufweisen, zeigen als Klebstoffe eine verbesserte Klebrigkeit bei Raumtemperatur und eine verlängerte Kontaktklebzeit nach Wärmeaktivierung.
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.