A New Synthesis of Ureas. IV. The Preparation of Unsymmetrical Ureas from Carbon Monoxide, Sulfur, and Amines
作者:R. A. Franz、Fred Applegath、F. V. Morriss、Fred Baiocchi、L. W. Breed
DOI:10.1021/jo01059a049
日期:1962.12
Preparation of ureas
申请人:MONSANTO CHEMICALS
公开号:US02857430A1
公开(公告)日:1958-10-21
POLYURETHANE POLYMER FOR REVERSIBLE ADHESIVE BONDS
申请人:Burckhardt Urs
公开号:US20100273008A1
公开(公告)日:2010-10-28
A polyurethane polymer which has sterically hindered urea groups which lead to the effect that the polyurethane has thermal lability at these sites. The invention further relates to a composition for preparing such a polyurethane polymer, said composition being suitable for the production of reversible adhesive bonds, seals and coatings. An inventive polyurethane polymer, or the corresponding composition for production thereof, finds use especially in automobile construction, where the possibility of detaching adhesive-bonded components and window panes is of significance for dismantling for repair purposes or else for utilization and recycling of used and accident-damaged automobiles.
Sulfonium Salts as Alkylating Agents for Palladium-Catalyzed Direct Ortho Alkylation of Anilides and Aromatic Ureas
novel method for the ortho alkylation of acetanilide and aromatic urea derivativesvia C–H activation was developed. Alkyl dibenzothiophenium salts are considered to be new reagents for the palladium-catalyzed C–H activation reaction, which enables the transfer of methyl and other alkyl groupsfrom the sulfonium salt to the aniline derivatives under mild catalytic conditions.
Regioselective bromination of aryl ureas with Phenyliodine(III) diacetate and potassium bromide
作者:Chun-Meng Wang、Jian-Yao Du、Jin-Yang Zhang、Kai-Xiang Tang、Tian-Hong Gao、Yun-Gen Xu、Li-Ping Sun
DOI:10.1016/j.tet.2019.130621
日期:2019.11
An efficient regioselective and operationally simple urea bromination method utilizing PIDA and potassium bromide is reported. This protocol proved to be effective on a broad range of substituted ureas in acetone at room temperature, forming the p-brominated compounds in 44–86% yields.