GB1303304A - - Google Patents

Abstract

1303304 Organometallic compounds SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ NV 2 Nov 1970 [4 Nov 1969 (2)] 52009/70 Heading C2J [Also in Divisions B1 and C5] A catalyst for the oligomerization of ethylene comprises a nickel atom chelated with a ligand of formula where R<SP>1</SP> and R<SP>2</SP> are C 1-20 organo groups, x and y are 0, 1 or 2 and together equal to 2 and Q is hydroxymethyl, C 1-10 hydrocarboyl or C 1-10 hydrocarbyloxycarbonyl and, when x is 2, Q may also be carbamyl or N-aryl- or N,N- diarylcarbamyl wherein the N-aryl group(s) may be substituted by one or more organo groups and the two R<SP>1</SP> groups together with the P atom may form a mono- or bicyclic heterocyclic phosphine, and usually also chelated with one or more further ligands such as organoarsines, - stilbines or -bismuthines and, especially, C 2-20 olefinically-unsaturated compounds of up to 4 olefinic linkages and up to 3 carbocyclic rings. A ligand of the latter type may especially be a C 2-12 olefin HC(R<SP>3</SP>)=(R<SP>4</SP>)OH where R<SP>3</SP> and R<SP>4</SP> are H, alkyl, cycloalkyl alkenyl, cycloalkenyl, aralkyl, aryl or alkaryl of up to C 8 or together may form a C 2-10 divalent aliphatic moiety of up to three additional olefinic double bonds, many olefin-nickel-P ligand chelates being specified. The latter are prepared by contacting the organophosphorus ligand at 25-100‹ C. with an olefin-nickel compound, which term includes #-allyl and bis-#-allyl nickel compounds, many of these also being specified. In the examples, bis - 1,5 - cyclooctadienenickel (0) is reacted with 9 - (R<SP>5</SP>) -9 - phosphabicyclononane where R<SP>5</SP>is 2-hydroxyethyl, 2-ketopropyl or carbamylmethyl and with diphenyl (R<SP>6</SP>) phosphine where R<SP>6</SP>is carbethoxymethyl or N,N- diphenylcarbamylmethyl, # - allylnickel bromide is reacted with 9-(N,N-diphenylcarbamylmethyl) - 9 - phosphabicyclo - [3,3,1] - nonane, and bis-#-allylnickel is reacted with diethyl- (N -phenylcarbamylmethyl )phosphine.