Preparation and applications of a polymer-supported phosphoryl azide
作者:Yuhua Lu、Richard T. Taylor
DOI:10.1016/j.tetlet.2003.10.066
日期:2003.12
A polymer-supported diphenylphosphoryl azide was prepared. This polymer-supported version of DPPA is useful due to its lower toxicity, moisture tolerance and ease of workup after reaction. The synthetic application of this solid-phase reagent was explored by conversion of a variety of carboxylic acids to urethanes and ureas through Curtius rearrangement reactions. Carboxylic acids bearing different
Experimental and theoretical studies of substituent effects in hydrogen bond based molecular recognition of a zwitterion by substituted arylureas
作者:Craig S. Wilcox、Eun-il Kim、David Romano、Lung Huang Kuo、Arthur L. Burt、Dennis P. Curran
DOI:10.1016/0040-4020(94)00921-g
日期:1995.1
Electron withdrawing groups have a strong effect on hydrogenbonding to aryl ureas. The effect of para substituents modestly exceeds the effect of meta substituents. Among common substituent parameters, σ− (ϱ = 1.77, r2 = 0.988) is found to be the best predictor for the observed effects of para substituents in aryl ureas. Semi-empirical and ab initio methods are used to calculate charge distributions
申请人:NATIONAL UNIVERSITY CORPORATION SHIZUOKA UNIVERSITY
公开号:US20190241598A1
公开(公告)日:2019-08-08
A novel hydrogelator that contains a monourea compound having a sugar structure, which can be produced by a simple method, includes a compound of the following Formula [1]:
(wherein S
g
is a sugar group, A is a divalent linking group, and R is a linear or branched alkyl group having a carbon atom number of 1 to 15, a cyclic alkyl group having a carbon atom number of 3 to 15, a linear or branched alkenyl group having a carbon atom number of 2 to 15, or a C
6-18
aryl group unsubstituted or substituted with at least one substituent selected from the group consisting of a C
1-10
alkyl group, a C
1-10
alkoxy group, a C
6-18
aryloxy group, a halogen atom, a nitro group, a phenyl group, a C
2-10
alkylcarbonyl group, and a C
7-18
aralkyl group).