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2 015 974

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IPC

(21) (22)

Application

4938128/04, 1991-05-22

(22)

Actual filing date

1991-05-22

(45)

Published

1994-07-15

(72)

Inventor

Kolomeer G.G.Min'Kovskij M.M.Jakovleva G.F.

(73)

Holder

Vsesojuznyj Nauchno-Issledovatel'Skij Institut Sinteticheskikh I Natural'Nykh Dushistykh Veshchestv

PROCESS FOR PREPARING MIXTURE OF DIHYDROCOUMARIN AND COUMARIN Russian patent published in 1994 - IPC

Abstract RU 2015974 C1

FIELD: perfume and food industries. SUBSTANCE: the product is a mixture of dihydrocoumarin and coumarin. Reagent 1: 2-oxocyclohexylpropionic acid methyl or butyl ester. Reaction conditions: Reagent 1 is dehydrocyclized at 230-260 C in a mixture of C₁₁-C₂₀ straight-chain paraffins having a melting point of 240-300 C in the presence of a palladium on charcoal catalyst or alumina with or without the addition of an inorganic salt or an oxide of a melt 11 of the Periodic Table under inert gas atmospheric pressure and at 230-260 C in the presence of an alkali metal salt of higher C₁₂-C₁₈ aliphatic acids used in an amount of 0.5-5% by weight of the catalyst in a mixture of C₁₁-C₂₀ straight-chain hydrocarbons having a melting point of 240-300 C, and after separation of the catalyst, the desired product is isolated by separating the cooled filtrate layers. This reaction makes it possible to accelerate the process by 2-3 times and to simplify the process by ruling out the separation of a high-boiling solvent by a vacuum rectification method. EFFECT: improved properties of the resulting compounds. 1 tbl

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RU 2 015 974 C1

Authors

Kolomeer G.G.

Min'Kovskij M.M.

Jakovleva G.F.

Dates

1994-07-15—Published

1991-05-22—Filed