Method of manufacturing methylidene-group-containing .alpha.,.omega.-unsaturated oligomers from .alpha.,.omega.-diolefins in the presence of organoaluminum compounds as catalysts

A .alpha.,.omega.-unsaturated oligomers containing at least one methylidene group having the general formula:

• ##STR3## where R and R' each independently represent hydrogen or an alkyl, aryl, aralkyl, or cycloalkyl group;
• x is 1 or a number between 3 and 25;
• y=x or x+2;
• n is a number between 1 and 99;
• and
• .SIGMA. C.sub.k =(x+4)(n+2)-(n+1) is the expression for the sum of the C-atoms in the chain.

A .alpha.,.omega.-unsaturated oligomers containing at least one methylidene group having the general formula:

• ##STR4## where R and R' each independently represent hydrogen or an alkyl, aryl, aralkyl, or cycloalkyl group;
• x is 1 or a number between 3 and 25;
• y=x or x+2;
• n is a number between 1 and 99;
• and
• .SIGMA. Ck=(x+4)(n+2)-(n+1) is the expression for the sum of the C-atoms in the chain;
• wherein the oligomers are produced from .alpha.,.omega.-diolefins having the general formula:
• ##STR5## where R, R', and x have the same meanings as above, with the reaction being carried out in the presence of organoaluminum compounds as catalysts, in the liquid phase at 150.degree.-350.degree. C.;
• wherein the catalysts have general formula AlX.sub.3 or AlX.sub.2 H, where X represents an aliphatic, alicyclic, or aromatic hydrocarbon group with 1-30 C atoms.