Preparation of d-.alpha.-tocopherol from natural intermediates

Details Preparation of d-.alpha.-tocopherol from natural intermediates Preparation of d-.alpha.-tocopherol from natural intermediates

1989-04-13

1990-05-15

Chan, Nicky

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D31172

Patent

active

049259601

ABSTRACT:
d-.alpha.-Tocopherol is prepared from a mixture obtained from natural intermediates and containing .alpha.-, .beta.-, .gamma.- and .delta.-tocopherols, by methylation at the aromatic ring of the tocopherols by reaction with formaldehyde or with a compound which donates formaldehyde under the reaction conditions, and subsequent catalytic hydrogenation, by a process in which the reaction with formaldehyde or with the formaldehyde donor is carried out at from 150.degree. to 200.degree. C. in the presence of an alkyl ester of phosphoric or phosphorous acid.

REFERENCES:
patent: 2486539 (1949-11-01), Weisler et al.
patent: 2486542 (1949-11-01), Weisler et al.
patent: 2843604 (1958-07-01), Hawks et al.
patent: 3819657 (1974-06-01), Baldwin et al.
patent: 4239691 (1980-12-01), Nelan et al.
Reinhold Plastics Application Series, Reinhold Publishing Corp., U.S.A.-1959 "Phenolic Resins", p. 26 and table on p. 28.

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