Abstract:
The subject matter of the invention is a process for the production of metal salts of trifluoromethane sulphonic acid by reacting trifluoromethane sulphonic acid with a metal alcoholate and the use thereof as esterification catalyst and/or transesterification catalyst for the production of hydroxycarboxylic acid esters.
Abstract:
Die vorliegende Anmeldung betrifft ein Verfahren zur Abtrennung und zur Rezyklierung von Katalysatorkomponenten eines chemischen Reaktionsgemisches aus der oxidativen Direktcarbonylierung.
Abstract:
The invention relates to a heterogeneous metathesis catalyst containing a support, a metal compound the metal of which is chosen from the group consisting of tungsten, rhenium and molybdenum, and a promoter, the promoter consisting of a niobium compound. The catalyst according to the invention has a high activity at low temperatures. The invention also relates to a process for the metathesis of olefins.
Abstract:
The present invention relates to a catalyst composition for the oligomerization of ethylene comprising at least one transition metal bisphenolate compound and at least one cocatalyst. The transition metal bisphenolate is a zirconium bisphenolate. The invention also relates to a process for the oligomerization of ethylene in the presence of the catalyst composition according to the invention. The process results in a high yield of C 4 -C 18 linear alpha-olefm and C 6 -C 10 linear alpha-olefin.
Abstract:
This invention relates to a transition metal compound represented by the formula LMX wherein M is a Group 3 to 11 metal L is a bulky bidentate or tridentate neutral ligand that is bonded to M by two or three heteroatoms and at least one heteroatom is nitrogen; X is a substituted or unsubstituted catecholate ligand provided that the substituted catecholate ligand does not contain a 1,2-diketone functionality.
Abstract:
Die vorliegende Anmeldung betrifft ein Verfahren zur Abtrennung und zur Rezyklierung von Katalysatorkomponenten aus einem chemischen Reaktionsgemisch dadurch gekennzeichnet, dass es mindestens einen Extraktionsschritt enthält.
Abstract:
Possibly dicationic or partially dicationic Group 4 metal compounds having e.g. utility as addition polymerization catalysts, obtainable by contacting a charge-neutral complex having two Lewis basic anionic ligand groups, X, of formula (I), with at least 2 molar equivalents of a charge-neutral, Lewis acidic compound, A, such that >/=2 Lewis basic groups of the Group 4 metal coordination complex are abstracted or partially abstracted, wherein Y and Y are independently anionic ligand groups that are covalently bonded to M by means of a sigma bond through an oxygen, phosphorus or nitrogen atom, and contain up to 50 atoms, not counting hydrogen, optionally joined through bridging group, J, and further optionally also contain a coordinate/covalent bond to M; J is an optional divalent bridging group having up to 20 atoms not counting hydrogen; j is 0 or 1; M is a Group 4 metal; X are independently Lewis bases; x is 0, 1, 2.
Abstract translation:可能具有阳离子或部分双阳离子的第4族金属化合物。 通过使具有两个路易斯碱性阴离子配体基团的电荷 - 中性络合物,式(I)的X与至少2摩尔当量的电荷中性路易斯酸性化合物A接触而获得,作为加成聚合催化剂,使得 > / = 2 4族金属配位络合物的路易斯碱性基团被抽提或部分抽提,其中Y 1和Y 2独立地是通过氧通过σ键与M共价结合的阴离子配体基团 ,磷或氮原子,并且含有至多50个原子,不计数氢,任选地通过桥连基团J连接,并且还任选地还含有与M的配位/共价键; J是任选的二价桥连基,其具有至多20个不计氢的原子; j为0或1; M是第4组金属; X 1独立地为路易斯碱; x <1>是0,1,2。
Abstract:
The invention relates to a method for the catalytic ring opening polymerization of lactones, carbonates, ethers, morpholine-2,5-diones and anhydrides comprising contacting these compounds under polymerizing conditions with at least one metal coordinating compound initiator and at least one co-initiator, wherein the co-initiator replaces at least one ligand of the metal coordinating compound by a replacement ligand, which is less sterically hindering, in order to form a catalytic unit, so that the active part of the catalytic unit formed in this way is capable of approaching easier the compound undergoing catalytic ring opening.
Abstract:
Aryloxyaluminoxanes containing the unit (I) where R is unsubstituted or substituted aryl, such as phenyl or naphthyl, are useful as cocatalysts in Ziegler-Natta and Kaminsky-type olefin polymerization catalysts. They can be formed by reaction of a source of water with an organoaluminum compound containing the desired aryloxy moiety or by reaction of preformed aluminoxane with an organic compound, such as a phenol, containing such a moiety.
Abstract:
Method of preparing epoxidation catalysts are disclosed, including methods comprising reacting an inorganic siliceous solid with a metal complex of the formulas: wherein the variables are defined herein.