The reactions of alkyl chlorides with bisanils (obtained from o-, m-, and p-phenylenediamines) under high pressure (10 kbar) were studied. Depending on the structure of the starting diamines and the solvent nature, hydrolysis of the reaction mixtures gave pure N-monoalkyl- or N,N'-dialkylphenylenediamines in high yields. The effect of the phase transition of the solvent on the direction of alkylation is discussed.
Revealing the unusual role of bases in activation/deactivation of catalytic systems: O–NHC coupling in M/NHC catalysis
作者:Victor M. Chernyshev、Oleg V. Khazipov、Maxim A. Shevchenko、Andrey Yu. Chernenko、Alexander V. Astakhov、Dmitry B. Eremin、Dmitry V. Pasyukov、Alexey S. Kashin、Valentine P. Ananikov
DOI:10.1039/c8sc01353e
日期:——
intramolecular reducing agents for the transformation of M(II) into “ligandless” M(0) species. This demonstrates that the disclosed base-mediated O–NHC coupling reaction is integrated into the catalytic M/NHC systems and can define the mechanism of catalysis (molecular M/NHC vs. “NHC-free” cocktail-type catalysis). A proposed mechanism of the revealed transformation includes NHC-OR reductive elimination, as
金属(M)与N-杂环卡宾(NHC)配体的络合物通常会在明显影响性能的氧碱的存在下催化许多反应。人们普遍认为,底物激活(例如铃木交叉偶联中的金属转移)或HX捕获(例如,在各种C–C和C–杂原子耦合,Heck反应,C–H功能化中)都需要碱,杂环化等)。这项研究提供了对M(II)/ NHC(M = Pd,Pt,Ni)配合物在溶液中的行为的见解,该配合物在常规参与催化的碱(KOH,NaOH,t- BuOK,Cs 2 CO 3,K)的作用下2一氧化碳3,等等)。公开了在典型的碱介导的M / NHC催化的反应条件下M( II)/ NHC络合物的先前未解决的转化。在催化中广泛使用的Pd( II)和Pt( II)配合物通过O–NHC偶联机理与碱反应生成M(0)物种和2(5)-氧代取代的唑。Ni(NHC) 2 X 2络合物在氢氧化钾水溶液存在下水解,并经过相同的O–NHC偶联,在t的作用下得到偶氮酮和金属镍
Process and composition for stabilization of ar-brominated styrenic monomer against premature polymerization
申请人:GE CHEMICALS, INC.
公开号:EP0291950A1
公开(公告)日:1988-11-23
A process and composition for stabilizing ar-brominated styrene polymer against polymerization which mixes an ar-brominated styrene monomer with a stabilizing amount of N,N-dialkylhydroxylamine to produce a stabilized monomer and novel stabilized compositions.
Lubricating composition for cylinders of marine two-stroke diesel engines
申请人:Infineum International Limited
公开号:EP1085076A1
公开(公告)日:2001-03-21
The cylinders of a two-stroke cross-head marine diesel engine characterised by a power output of 4,000 kW per cylinder or greater are lubricated by a cylinder lubricant comprising a basestock of lubricating viscosity, on overbased metal detergent and an oil-soluble sulfur-containing compound or phosphorus-containing compound, thereby to raise the onset temperature of scuffing-type mechanical wear of the cylinder walls.
A lubricant suitable for use in a trunk piston diesel engine characterised by a power output of 200 kW or greater. The trunk piston diesel engine may be for use in marine, power generation or rail traction applications. The lubricant comprises a basestock of lubricating viscosity, an overbased metal detergent, preferably having an ash content of at least 0.85% sulfated ash, and an ashless or metal-free auxiliary additive comprising at least one of: an oil-soluble sulfurized alkylphenol, a phosphorosulfurized or sulfurized hydrocarbon, a sulfide of an oil, a fat or a polyolefin, or an amine phosphate.
Combinations of phosphorus-containing compounds for use as anti-wear additives in lubricant compositions
申请人:Afton Chemical Corporation
公开号:EP2298854A1
公开(公告)日:2011-03-23
The present disclosure relates to a lubricant composition comprising a first phosphorus compound, a second phosphorus compound, and a third phosphorus compound, wherein the first phosphorus compound is present in the lubricant composition in an amount to provide between about 120 and 350 ppm phosphorus. The lubricant composition may provide robust anti-wear and reduced pitting.