[EN] METHODS FOR PHOSPHINE OXIDE REDUCTION IN CATALYTIC WITTIG REACTIONS<br/>[FR] PROCÉDÉS POUR LA RÉDUCTION D'UN OXYDE DE PHOSPHINE DANS DES RÉACTIONS DE WITTIG CATALYTIQUES
申请人:UNIV DUBLIN CITY
公开号:WO2014140353A1
公开(公告)日:2014-09-18
A method for increasing the rate of phosphine oxide reduction, preferably during a Wittig reaction comprising use of an acid additive is provided. A room temperature catalytic Wittig reaction (CWR) the rate of reduction of the phosphine oxide is increased due to the addition of the acid additive is described. Furthermore, the extension of the CWR to semi-stabilized and non-stabilized ylides has been accomplished by utilization of a masked base and/or ylide-tuning.
[EN] HALOALUMINOXANE COMPOSITIONS, THEIR PREPARATION, AND THEIR USE IN CATALYSIS<br/>[FR] COMPOSITIONS D'HALOALUMINOXANE, PREPARATION ET UTILISATION DE CELLES-CI DANS DES CATALYSES
申请人:ALBEMARLE CORP
公开号:WO2005066191A1
公开(公告)日:2005-07-21
Novel haloaluminoxane compositions have been formed. The halogen is fluorine, chlorine, and/or bromine, and the amount of halogen atoms present in said composition is in the range of about 0.5 mole % to about 15 mole % relative to aluminum atoms.
Hydroxychroman Derivatives As Engine Oil Antioxidants
申请人:Crawley Seth L.
公开号:US20130165355A1
公开(公告)日:2013-06-27
A lubricant and concentrate composition comprises a hydroxychroman derived antioxidant and a method for improving the performance of a lubricant composition, especially a lubricant composition for an internal combustion engine, comprising the use of a lubricant containing said antioxidant.
Gegenstand der vorliegenden Erfindung ist ein Verfahren zur Herstellung von Carbonsäureestern aus Carbonsäuren und Alkoholen, das dadurch gekennzeichnt ist, daß man als Veresterungkatalysatoren oxetangruppenhaitige, neutrale Phosphite einsetzt.
Polymerization of cycloolefins and catalytic system suitable for use therein
申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0528496A2
公开(公告)日:1993-02-24
A catalyst system for the polymerization of cyclic olefins, comprising
(1) a tungsten compound which is obtainable by combining a tungsten halide and/or a tungsten oxyhalide with a phenol compound which is substituted with a bulky alkyl group at the positions ortho with respect to the hydroxyl group;
(2) one or more compounds of the general formula
wherein R¹, R² and R³ each represent an optionally subsituted alkoxy group in the range of from 2 to 8 carbon atoms and preferably from 2 to 4 carbon atoms, and wherein at most one of the symbols R¹, R² and R³ may represent hydrogen or halogen and preferably chlorine, the compound of formula I being substantially free of organo-tin compounds;
(3) a bonor halide,
and a process for in mould polymerization using such catalysts.