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2 185 360

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Application

2000126367/04, 2000-10-19

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Start date

2000-10-19

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Actual filing date

2000-10-19

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Published

2002-07-20

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Inventor

Dzhemilev U.M.Ibragimov A.G.Ramazanov I.R.Luk'Janova M.P.Sharipova A.Z.

(73)

Holder

Institut Neftekhimii I Kataliza An Rb I Unts Ran

METHOD OF SYNTHESIS OF 1,2-DIALKYL-1Z,3-BUTADIENES Russian patent published in 2002 - IPC

Abstract RU 2185360 C1

FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to a method of synthesis of 1,2-dialkyl-1Z,3-butadienes of the general formula (I) where R is n-Pr, n-Bu that can be used in processes of polymerization, diene synthesis and as semiproducts in paint and varnish industry also. Method involves interaction of dialkylsubstituted acetylenes of the formula RC≡CR with triethylaluminium (Et3Al) taken in mole ratio = 10 : (10-20) : (0.1-0.5), respectively. Interaction reaction is carried out under normal conditions in hexane medium for 8 h. Then allyl acetate (AllylOAc) and palladium acetylacetonate (Pd(acac)2) in catalytic amounts are added to reaction mass at plus 5 C taken in the mole ratio RC≡CR: : AllylOAc : Pd(acac)2 = 10 : (30-50) : : (0.1-0.5), respectively, in tetrahydrofuran medium and reaction mass is stirred at the room temperature for 8-12 h followed by hydrolysis with hydrochloric acid solution. The yield is 45-75%. EFFECT: high regio- and stereoselectivity of synthesis of 1,2-dialkyl-1Z,3-butadienes, high yield. 1 tbl

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RU 2 185 360 C1

Authors

Dzhemilev U.M.

Ibragimov A.G.

Ramazanov I.R.

Luk'Janova M.P.

Sharipova A.Z.

Dates

2002-07-20—Published

2000-10-19—Filed

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