Some observations on the proton magnetic resonance spectra of phosphonium salts
作者:C.E. Griffin、M. Gordon
DOI:10.1016/s0022-328x(00)80195-3
日期:1965.5
The protonmagneticresonancespectra of a series of alkyl-, benzyl- and allyltriphenyl and -trialkylphosphonium salts and alkylenebis(triphenylphosphonium) salts have been determined. Chemical shifts of α-protons are dependent upon solvent and concentration and independent of temperature and halide ion; phosphorus-proton coupling constants are dependent only on solvent. In a series of methylphosphonium
已经确定了一系列烷基-,苄基-和烯丙基三苯基和-三烷基phosph盐和亚烷基双(三苯基phosph)盐的质子磁共振谱。α质子的化学位移取决于溶剂和浓度,并且与温度和卤离子无关。磷-质子耦合常数仅取决于溶剂。在一系列甲基phosph盐中,双峰| J PCH 3 | R 1是恒定的,并且独立于与磷连接的其他基团(烷基,芳基)的性质。在两种对位取代的苄基salts盐中观察到四键磷-芳族质子偶联。
A process for rapidly curing a brominated fluoroelastomer
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0140207A2
公开(公告)日:1985-05-08
A process for rapidly curing a fluoroelastomer which comprises mixing and heating a fluoroelastomer copolymer whose interpolymerized units consist essentially of vinylidene fluoride, at least one other fluorine-containing monomer copolymerizable therewith, said monomer being a compound which contains 2-7 carbon atoms, contains no bromine, and contains at least as many fluorine atoms as carbon atoms and contains up to 3 mole percent of units derived from a bromine-containing olefin; a quaternary phosphonium compound; a bisphenol or an ammonium or phosphonium salt thereof; and a dialkylaminopyridine or a diazabicyclo compound having the formula
where n is 2-8 or
0.2-0.8 parts by weight per hundred parts fluoroelastomer of a carboxylic acid salt of (a) or (b).
The incorporation of graphene oxide sheets into phosphonium ionic liquid stationary phases led to a great improvement of their separation efficiencies.