1-丁基-3-丙基脲 、 草酸醛 、 硫酸 在
silica gel 作用下,
以
异丙醇 为溶剂,
以After work up and silica gel chromatography gave 2.6 g (33%) of an oil的产率得到4,5-diisopropoxy-1-butyl-3-propylimidazolidin-2-one
Synthesis of 1,3-Disubstituted Symmetrical/Unsymmetrical Ureas via Cs<sub>2</sub>CO<sub>3</sub>-Catalyzed Transamination of Ethylene Carbonate and Primary Amines
作者:Sachin R. Jagtap、Yogesh P. Patil、Anil G. Panda、Bhalchandra M. Bhanage
DOI:10.1080/00397910802638503
日期:2009.5.22
Abstract Cs2CO3-catalyzed transamination of primary amines and ethylene carbonate proceeds to form 1,3-disubstituted symmetrical/unsymmetrical ureas in excellent yields. The effect of different reaction parameters such as influences of bases, temperature, and reaction time were investigated for the title reaction.
Water borne high solids coating compositions are made by blending a water-dispersible, crosslinkable organic polymer free of amide groups, water, at least one reactive urea derivative, a crosslinking agent and optionally a crosslinking catalyst. Optionally a mixture of reactive urea and carbamate derivatives can be used. The resultant water borne high solids coating compositions can be either solutions or dispersions depending upon the particular polymer and reactive urea or carbamate chosen as the reactive cosolvent or reactive diluent.
申请人:Technology Corporation United Carbide Chemicals and Plastics
公开号:US05039759A1
公开(公告)日:1991-08-13
Water borne high solids coating compositions are made by blending a water-dispersible, crosslinkable organic polymer free of amide groups, water, at least one reactive urea derivative, a crosslinking agent and optionally a crosslinking catalyst. Optionally a mixture of reactive urea and carbamate derivatives can be used. The resultant water borne high solids coating compositions can be either solutions or dispersions depending upon the particular polymer and reactive urea or carbamate chosen as the reactive cosolvent or reactive diluent.
Hair waving system and lotion, and method of waving hair
申请人:Helene Curtis Industries, Inc.
公开号:EP0102495A2
公开(公告)日:1984-03-14
A hair waving system comprising at least two separately packaged components and methods of its use are described. One of the components is an aqueous activator containing about 0.5 to about 12 molar urea stabilized with a sufficient amount of an ammonium salt of a strong acid to adjust the pH value of the activator to about 6-8. The second package of the system contains an amount of hair disulfide bond-breaking agent sufficient to wave hair after admixture with the activator, and provides a pH value of 6.5-9.5 to the admixed waving lotion. A particular waving lotion is also disclosed.
Cosmetic compositions comprising an aqueous solution of an urea compound, hair treatment, skin moisturizer, hair waving system, retardation of alkali production, and hair and skin treatment methods
申请人:Helene Curtis Industries, Inc.
公开号:EP0101887A2
公开(公告)日:1984-03-07
A cosmetic composition containing stabilized aqueous urea present at about 0.5 to about 12 molar and containing a sufficient amount of an ammonium salt of an unreactive acid to adjust the pH value of the urea solution at about 6 to about 8 is disclosed, as are methods of its use.