METHOD FOR PRODUCING 2-ALKYL SUBSTITUTED 1,3-DIENES Russian patent published in 1998 - IPC

FIELD: petrochemistry, namely, origin materials for production of aromatic principles, attractants, polymer materials, paints, varnish and other. SUBSTANCE: 2-alkyl substituted 1,3-dienes have common formula where R is C₄H₉, C₆H₁₃, C₉H₁₉ are prepared by consequent mixing of solution of triethylene aluminium in aliphatic solvents Cp₂Z₁-Cl₂ and with α-olefin, their molar ratio being (10-12):(0.2-0.4):10. The process is followed by mixing at room temperature within 8 h, then at temperature about (-5) C catalyst is added. Said catalyst is prepared by mixing Ni(acai)₂, Ph₃P and i-Bu₂AkH followed by adding allyl acetate at their molar ratio (0.3-0.5): (1.2-2.0):(2.4-4.0):(30-36) respectively, the process takes place in aliphatic solvents by mixing of reaction mixture at room temperature within 8-12 h. Yield of 2-alkyl substituted 1,3-dienes is 60-84 %. EFFECT: improved quality of desired product. 1 tbl