Patent GB-936544-A (GB)
Title: Improvements in or relating to the production of organo-boranes and organo-aluminium-nitrogen polymers
IPC: C08G79/08
Filed: 1961-09-28
Abstract: Organoboranes BR3 and organoaluminium nitrogen polymers  (X A1NR1)n or [B-(NR1A1XR)3]n are made by reacting a substituted borazole (X BNR1)3 with an organoaluminium compound A1R3, wherein the R groups, which may be the same or different, are hydrocarbon groups containing no non-aromatic unsaturation, the X groups, which may be the same or different, are chlorine or bromine atoms or organic radicals, said organic radicals being bonded to the borazole nucleus either directly or through a single oxygen atom and each being a hydrocarbon group containing no non-aromatic unsaturation or a hetero-aromatic group containing no substituents other than hydrocarbon groups containing no non-aromatic unsaturation, and the R1 groups which may be the same or different, are hydrogen atoms or hydrocarbon groups containing no non-aromatic unsaturation, or hetero-aromatic groups which contain no substituent other than hydrocarbon groups containing no non-aromatic unsaturation.  Preferred organoaluminium compounds are those in which R is an alkyl or unsubstituted or alkyl-substituted phenyl group. Preferred borazoles are those in which the X groups are chlorine, bromine, alkoxy, phenoxy, quinolineoxy or alkyl or unsubstituted or alkyl-substituted aromatic or hetero-aromatic group and the R1 groups are hydrogen atoms or the same type of hydrocarbon groups as for X. The reaction may be effected in an inert solvent, preferably one having a boiling point greater than that of the organoborane, e.g. benzene, toluene, xylene, mineral oil, methylnaphthylene, dodecane, alkyl-substituted toluenes and nonane.  In examples, triethylaluminium is reacted with B-trichloro-borazole, B-triphenyl-borazole and hexamethyl-borazole; trimethyl aluminium with B-tribromo-N-triethyl-borazole; tri-isopropyl aluminium with B-triphenyl-N-trimethyl-borazole; and tri-isobutylaluminium with B-tri-n-hexylborazole.ALSO:Organoboranes BR3 and organoaluminium nitrogen polymers (XAINR1)n or [B-(NR1AIXR)3]n are made by reacting a substituted borazole (XBNR1)3 with an organoaluminium compound AlR3, wherein the R groups, which may be the same or different, are hydrocarbon groups containing no nonaromatic unsaturation, the X groups, which may be the same or different, are chlorine or bromine atoms or organic radicals, said organic radicals being bonded to the borazole nucleus either directly or through a single oxygen atom and each being a hydrocarbon group containing no non-aromatic unsaturation or a hetero-aromatic group containing no substituents other than hydrocarbon groups containing no non-aromatic unsaturation, and the R1 groups which may be the same or different, are hydrogen atoms or hydrocarbon groups containing no nonaromatic unsaturation, or hetero-aromatic groups which contain no substituent other than hydrocarbon groups containing no nonaromatic unsaturation. Preferred organoaluminium compounds are those in which R is an alkyl or unsubstituted or alkyl-substituted phenyl group.  Preferred borazoles are those in which the X groups are chlorine, bromine, alkoxy, phenoxy, quinolineoxy or alkyl or unsubstituted or alkyl-substituted aromatic or heteroaromatic group and the R1 groups are hydrogen atoms or the same type of hydrocarbon groups as for X. The reaction may be effected in an inert solvent, preferably one having a boiling point greater than that of the organoborane, e.g., benzene, toluene, xylene, mineral oil, methyl-naphthylene, dodecane, alkyl-substituted toluenes and nonane.  In examples, triethyl aluminium is reacted with B-trichloro-borazole, B-triphenyl borazole and hexamethyl-borazole; trimethyl aluminium with B-tribromo-N-triethyl-borazole; tri-isopropyl aluminium with B-triphenyl-N-trimethyl-borazole; and tri-isobutyl-aluminium with B-tri-n-hexylborazole.