Abstract: Process for the oligomerization of one or more olefinically unsaturated monomers comprising three or more carbon atoms, at least one of these monomers consisting of a C3 to C30 aliphatic mono-olefin, which process comprises reacting the olefinically unsaturated monomer(s) under oligomerization conditions in the presence of an effective amount of a catalyst system based on

Abstract: A carbonylation process, wherein formaldehyde or a derivative thereof is reacted with carbon monoxide in the presence of a catalyst composition including: a) an acidic compound with pKa value below −1, and b) a sulfone.

Abstract: It is disclosed a new catalyst system, having high catalytic activity in the oligomerization of &agr;-olefins, comprising a bridged bis-amido Group 4 metal compound of formula (I): wherein M is Ti, Zr or Hf; Y is Si, Ge or Sn; X is a hydrogen, halogen or an hydrocarbon radical; R1, R2, R3, R4, R5 and R6 are hydrocarbon radicals, optionally containing Si, Ge, O, S, P, B or N atoms; Q is a neutral Lewis base; and m is 0-2; in association with a boron activating compound, and with one or more branched alkylaluminiums and/or alumoxanes of branched alkylaluminiums; said catalyst system allows oligomers to be obtained in high yields, with a high selectivity towards &agr;-oligomers.

Abstract: It is disclosed a new catalyst system, having high catalytic activity in the oligomerization of &agr;-olefins, comprising a bridged bis-amido Group 4 metal compound of formula (I): 1

Abstract: A carbonylation process, wherein formaldehyde or a derivative thereof is reacted with carbon monoxide in the presence of a catalyst composition including:

Abstract: The invention provides a catalyst composition for hydrogenation of polymers containing ethylenical unsaturation which comprises at least:(a) a titanium compound of the formula ##STR1## (I) wherein A.sub.1 represents an optionally substituted indenyl group of the formula ##STR2## wherein substituents R.sub.1 and R.sub.2 may be the same or different and each may be selected from halogen, phenyl which optionally may bear one or more the same or different substituents, lower alkyl, alkoxy, phenoxy, phenylalkoxy, benzyl, and a bulky substituent containing one or more hetero atoms such as tri (loweralkyl)silyl, --NPh.sub.2, --NHPh, --BPh.sub.2, and --B(OPh).sub.2, wherein n may be an integer of from 0 to 4 and m may be an integer of from 0 to 3,(II)wherein A.sub.2 has the same meaning as A.sub.1 or alternatively represents an optionally substituted cyclopentadienyl group, and wherein L.sub.1 and L.sub.

Abstract: The invention provides a catalyst composition suitable for hydrogenation of polymers containing ethylenical unsaturation which comprises at least:(a) a titanium compound of the formula ##STR1## wherein A.sub.1 represents an optionally substituted heterocyclic five membered ring comprising a phosphorous or nitrogen heteroatom, and A.sub.2 has the same meaning as A.sub.1 or alternatively represents an optionally substituted cyclopentadienyl group or indenyl group, and wherein L.sub.1 and L.sub.2 may be the same or different and each may be selected from hydrogen, halogen, lower alkyl, phenyl, aralkyl, having from 7 to 10 carbons, lower alkoxy group, phenyloxy, phenylalkoxy group having from 7 to 10 carbon atoms, carboxyl, carbonyl, a .about.CH.sub.2 P(Phenyl).sub.2, --CH.sub.2 Si(lower alkyl).sub.3 or .about.P(phenyl).sub.

Abstract: There is provided an organometallic compound comprising a metal M of Group 3 to 6 of the Periodic Table or the Lanthanide series and at least one (hetero)cyclohexadienyl ligand of the general formula (I)C.sub.5 AR.sub.nwherein A is an element chosen from Group 13 to 16 of the Periodic Table, R which can be connected to C or to A and which may form a bridge is independently hydrogen or an organic substituent which may contain one or more hetero-atoms and n is 3 plus the number of valencies of A. There is further provided the use of this compound as a catalyst, with a co-catalyst, in a process for the (co)oligomerisation or (co)polymerisation of olefinically unsaturated hydrocarbons.

Abstract: The invention provides a catalyst composition suitable for hydrogenation of polymers containing ethylenic unsaturation, which comprise:(a) a titanium compound of the formula, ##STR1## wherein A.sub.1 and A.sub.2 are the same or different and each represents a substituted or unsubstituted cyclopentadienyl or indenyl group,wherein X.sub.1 and X.sub.2 are the same or different and each represents hydrogen, halogen, a lower alkyl or lower alkoxy, optionally substituted phenyl or phenoxy, or aralkyl having from 7 to 10 carbon atoms, or phenylalkoxy having from 7 to 10 carbon atoms, carboxyl, carbonyl, a --CH.sub.2 P(Phenyl).sub.2, --CH.sub.2 Si(lower alkyl).sub.3, or --P(phenyl).sub.2 group.(b) an alkalimetal hydride, added as such or prepared in situ in the polymer solution from the alkalimetal terminated living polymer and/or from additionally added alkalimetal alkyl and hydrogen, the molar ratio of the alkalimetal:titanium in the polymer solution during hydrogenation being at least 2:1;(c) a borium compoundB(R.