Activation of Urea as a Leaving Group in Substitution Reactions of Formamidine Ureas
作者:David D. Díaz、Warren G. Lewis、M. G. Finn
DOI:10.1246/cl.2005.78
日期:2005.1
The reactions of formamidine ureas with amines take different paths under protic vs. nonprotic conditions; loss of the urea fragment has been observed for the first time when protons are made available intra- or intermolecularly.
Chemoselective Esterification of Natural and Prebiotic 1,2-Amino Alcohol Amphiphiles in Water
作者:Ahanjit Bhattacharya、Lalita Tanwar、Alessandro Fracassi、Roberto J. Brea、Marta Salvador-Castell、Satyam Khanal、Sunil K. Sinha、Neal K. Devaraj
DOI:10.1021/jacs.3c12038
日期:2023.12.13
enzyme-free esterification of amphiphiles in water and none that can occur in water at physiological pH using biochemically relevant acylating agents. Here we report the unexpected chemoselective O-acylation of 1,2-amino alcohol amphiphiles in water directed by Cu(II) and several other transition metal ions. In buffers containing Cu(II) ions, mixing biological 1,2-amino alcohol amphiphiles such as sphingosylphosphorylcholine
METALWORKING FLUID COMPOSITION AND METALWORKING PROCESS
申请人:KYODO YUSHI CO., LTD.
公开号:EP1892282A1
公开(公告)日:2008-02-27
The present invention provides a water-soluble metal-processing oil composition which is excellent in putrefaction resistant properties and sparingly has any bad influence upon global environment and human body and a method for processing metals which makes use of the metal-processing oil composition.
The metal-processing oil composition of the invention comprises an amine carrying a linear or branched alkyl group having not less than 4 carbon atoms (component A) in an amount ranging from 0.5 to 20% and an amine carrying a cycloalkyl ring or a benzene ring (component B) in an amount ranging from 0.5 to 20% and the method for processing metals is characterized in that it uses the metal-processing oil composition.
LUBRICATING OIL COMPOSITION, AND SLIDING MECHANISM USING LUBRICATING OIL COMPOSITION
申请人:Idemitsu Kosan Co., Ltd
公开号:EP2826845A1
公开(公告)日:2015-01-21
Disclosed is a lubricating oil composition for low-friction sliding materials, which is used in a sliding mechanism where a DLC film containing hydrogen in an amount of from 5 atom% to 50 atom% is formed on at least one sliding surface. The lubricating oil composition contains, in the lubricant base oil therein and based on the total amount of the composition, (A) an organic zinc dithiophosphate in an amount of from 0.005% by mass to 0.12% by mass in terms of the phosphorus concentration therein, (B) an amine-based friction-reducing agent in an amount of from 0.05% by mass to 5.0% by mass, and (C) an alkaline earth metal salicylate-based detergent and/or an alkaline earth metal sulfonate-based detergent in an amount of from 0.05% by mass to 0.5% by mass in terms of the alkaline earth metal concentration therein, wherein the component (A) contains, based on the total amount of the composition, a zinc primary dialkyldithiophosphate in an amount of from 0.005% by mass to 0.05% by mass in terms of the phosphorus concentration therein.
A lubricant oil composition of the present invention that is prepared by blending a boron-containing compound therein, the boron-containing compound having a ratio of an integrated value of peaks in the 5 to 25 ppm chemical shift to an integrated value of peaks in the -10 ppm to 25 ppm chemical shift, as determined by 11B-NMR measurement in deuterochloroform using BF3·OEt2 as an external standard (0 ppm), of 0.5 or higher and 1.0 or lower.