| 摘要 |
<p>Selective dimension of conjugated dienes is effected by introducing into an autoclave cooled at 0 degrees C and under an inert gas, (A) a catalyst system opt. contg. a solvent and comprising (1) a Gp. VIII metal cpd., (2) a 2-electron donating ligand and (3) and H-donating cpd. formed in situ by reacting an amine with an aldehyde, and (B) an amt. of diene such that the wt. ratio diene/metal cpd. is 250-450, and after closing the autoclave, heating for 1-20 hrs. with stirring at 20-120 (40-80) degrees C while keeping the reaction mixt. liquid, then cooling, condensing the non-converted diene and distilling the obtd. diene. Used for the dimenisation of butadiene, isoprene, dimethylbutadiene and piperylenes into octadienes. Process obviates the use of the expensive Pd or Pt as catalyst.</p> |
