Abstract: A process is described for the preparation of compounds having the formula (I) C6F4HX, wherein X is Br or Cl, which comprises reacting tetrafluorobenzene with a halogen in the presence of a Lewis acid catalyst.

Abstract: Process for the preparation of 1-hexane consisting in effecting the oligomerization of ethylene in the presence of a catalyst comprising a vanaduim complex having the formula: (arene)2 VX wherein the term arene represents benzene or mono-, di-, or tri-alkylsubstituted benzene, V is a vanaduim ion with a low wxidation state, and X is an anion selected from non-coordinated anions such as B(Ar)4—, AlCl4—, carboxylates and sulfonates.

Abstract: A process for the preparation of alternated linear copolymers based on carbon monoxide and one or more compounds having an unsaturation of the alkenylic type comprises, reacting in a halogenated aromatic or aliphatic solvent the carbon monoxide and one or more compounds having an alkenylic unsaturation in the presence of a catalyst having general formula (I)?Pd(chel)(chel')!.sup.+ ?A.sup.- !wherein: chel represents a non-charged bidentate chelating agent, chel' represents the anion of an organic compound containing a double carbon--carbon bond co-ordinated via .pi. bond to palladium (Pd) and a carbanion bound via .sigma. bond to palladium which is co-ordinated to the metal as a bidentate chelating agent and A.sup.- is an anion of a non-esterifiable or almost non-esterifiable and non-coordinating acid.

Abstract: Linear alternating copolymers of carbon monoxide and at least one compound containing an alkenyl unsaturation are obtained by reaction between carbon monoxide and at least one compound containing an alkenyl unsaturation, in a solvent which is liquid under the operating conditions, in the presence of a preformed bischelated catalyst having general formula (I) active without cocatalysts:?Pd(chel)(chel')!.sup.++ ?A.sup.- !.sub.2 (I)wherein: chel and chel', the same or different, represent a nitrogenated or phosphorated bidentate chelating agent, and A.sup.- represents an essentially non-co-ordinating, non-esterifiable and non-labile anion selected from (3,5-(CF.sub.3).sub.2 -C.sub.6 H.sub.3).sub.4 B.sup.-, tetra(perfluorophenyl)borate B(C.sub.6 F.sub.5).sub.4.sup.- and Al(C.sub.6 F.sub.5).sub.4.sup.-.

Abstract: An improved process is described for the preparation of alternating linear copolymers based on carbon monoxide and at least one compound containing an alkenyl unsaturation which comprises reacting in a liquid solvent under the operating conditions, a mixture of carbon monoxide and one or more compounds containing an alkenyl unsaturation in the presence of:(i) a catalyst having general formula (I)?Pd(chel) (chel') !.sup.++ ?A.sup.- !.sub.2 (I)wherein chel and chel' the same or different, represent a nitrogenated or phosphorated bidentate chelating agent, and A.sup.- represents an essentially non-coordinating, non esterifiable and non labile anion of an acid with pKa less than 2; and(ii) a cocatalyst having general formula (II)?chel"H.sup.+ !?A'.sup.- ! (II)wherein A'.sup.-, the same as or different from A.sup.-, has the same meaning defined above and chel" represents a nitrogenated bidentate chelating agent the same as or different from chel and chel'.

Abstract: A catalyst active in the preparation of alternating olefin/carbon monoxide (CO) copolymers is constituted by:(a) Pd(O.sub.2 CNEt.sub.2).sub.2 (NHET.sub.2).sub.2 supported on a solid carrier preferably constituted by hydroxylated silica,(b) an either mono- or bidentate ligand containing one or two nitrogen or phosphorous atoms capable of linking to Pd atom by dative bonds,(c) a mineral or organic acid.Disclosed are the preparation of the catalyst and the use of said catalyst in alternated copolymerization of ethylene (C2) and/or other olefins with carbon monoxide (CO).

Abstract: A mixed-matrix composite material reinforced with continuous fibre comprising a flexible sheath of thermoplastic polymer covering a multifibre filament impregnated with a powder consisting of:50-99% by weight, and preferably 70-95%, of a thermoplastic polymer;50-1% by weight, and preferably 30-5%, of a C.sub.2 -C.sub.4 olefin/carbon monoxide alternating polymer having an intrinsic viscosity exceeding 0.1 dl/g when measured in m-cresol at 100.degree. C.

Abstract: Polymers having a very good combination of chemical, mechanical and process properties, and particularly useable either alone or as mixtures, as high-tenacity thermoplastic polymer and as elastomers or elastomeric modifiers, contain, randomly distributed along their chain, repeating cycloketonic structural units having the following general formula (I): ##STR1## wherein: A represents a tetravalent aliphatic or cycloaliphatic, substituted or non-substituted moiety containing a total number of from 4 to 50, preferably from 4 to 20, carbon atoms.Such polymers can be prepared by means of a process which comprises reacting, in a liquid media, a polydiene containing adjacent structural units derived from the 1,4-cis polymerization of conjugated dienes, with carbon monoxide, in the presence of free radical generating compounds and, optionally, a compound capable of acting as a hydrogen donor.

Abstract: A catalyst active in the preparation of alternating olefin/carbon monoxide (CO) copolymers is constituted by:(a) at least one salt of a metal of Group IB of the Periodic System,(b) an either mono- or bidentate ligand containing one or two nitrogen or phosphorus atoms capable of linking to the copper, silver or gold atom by means of dative bonds,(c) a mineral or organic acid.Disclosed are the preparation of the catalyst and the use of said catalyst in alternated copolymerization of ethylene (C2) and/or other olefins with carbon monoxide.

Abstract: A catalyst active in the preparation of alternating olefin/carbon monoxide (CO) copolymers is constituted by:(a) at least one salt of a metal of Group IB of the Periodic System,(b) a mono or bidentate ligand base containing one or two nitrogen or phosphorus atoms capable of linking to the metal atom by means of dative bonds,(c) a mineral or organic oxidizer agent.Also disclosed are the preparation of the catalyst and the use of said catalyst in alternated copolymerization of ethylene (C2) and/or other olefins with carbon monoxide (CO).

Abstract: A catalyst active in the preparation of alternating olefin/carbon monoxide (CO) copolymers is constituted by:(a) Pd(O.sub.2 CNEt.sub.2).sub.2 (NHEt.sub.2).sub.2 supported on a solid carrier preferably constituted by hydroxylated silica,(b) an either mono- or bidentate ligand containing one or two nitrogen or phosphorous atoms capable of linking to Pd atom by dative bonds,(c) NOBF.sub.4.Disclosed are the preparation of the catalyst and the use of said catalyst in alternated copolymerization of ethylene (C2) and/or other olefins with carbon monoxide (CO).

Abstract: A catalyst active in the preparation of alternating olefin/carbon monoxide (CO) copolymers is constituted by:(a) Pd(O.sub.2 CNEt.sub.2).sub.2 (NHET.sub.2).sub.2 supported on a solid carrier preferably constituted by hydroxylated silica,(b) an either mono- or bidentate ligand containing one or two nitrogen or phosphorous atoms capable of linking to Pd atom by dative bonds,(c) a mineral or organic acid.Disclosed are the preparation of the catalyst and the use of said catalyst in alternated copolymerization of ethylene (C2) and/or other olefins with carbon monoxide (CO).

Abstract: Process for preparing straight, alternate polymers based on carbon monoxide and at least one olefin, which comprises causing carbon monoxide and the olefin to react in the presence of:(a) a catalyst of general formula (I):[Pd(chel)(chel')]++[A-].sub.2 (I)wherein chel and chel', which may be the same, or different from each other, represent a bidentate chelating agent and A- stands for an anion of an acid having a pKa smaller than 6; and(b) optionally, an organic oxidizer agent.