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2 032 667

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C1

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IPC

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Application

4936255/04, 1991-05-16

(22)

Actual filing date

1991-05-16

(45)

Published

1995-04-10

(72)

Inventor

Vakulova L.A.Zhidkova T.A.Samokhvalov G.I.Khristoforov V.L.

(73)

Holder

Nauchno-Proizvodstvennoe Ob"Edinenie

METHOD FOR PREPARING OF BETA-CAROTENE Russian patent published in 1995 - IPC

Abstract RU 2032667 C1

FIELD: organic chemistry. SUBSTANCE: desired product is prepared according reaction of carbonyl olefination. Retiniltriphenylphosphonium hydrosulfate as ethanol solution together with solution of potassium hydroxide is added into suspension of retinenhydroquinone complex. Said complex is preliminary cooled to (-15)-(-10) C. Reaction mixture is allowed to stand within 4-6 h at 0-20 C. Thus prepared crystalline beta-carotene is isolated, its yield being 86 %. The process is followed by isomerization which is carried out in aqueous medium at 96-98 C within 5-6 h to produce trans-beta-carotene. EFFECT: improves efficiency of the method.

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RU 2 032 667 C1

Authors

Vakulova L.A.

Zhidkova T.A.

Samokhvalov G.I.

Khristoforov V.L.

Dates

1995-04-10—Published

1991-05-16—Filed

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