Unsaturated vitamin E intermediates--dehydro and didehydro .alph

Details Unsaturated vitamin E intermediates--dehydro and didehydro .alph Unsaturated vitamin E intermediates--dehydro and didehydro .alph

1977-09-12

1979-09-18

Chan, Nicky

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260654R, 585600, 585641, C07D31170

Patent

active

041682718

ABSTRACT:
New dehydrotocopherols, namely cis- and trans- 3',4'-dehydrotocopherol; cis- and trans- 4',5'-dehydrotocopherol; and 4',4'-a-dehydrotocopherol, and new didehydrotocopherols, namely cis- and trans- 3',4'-11',12'-didehydrotocopherol; cis- and trans- 4',5'-11',12'-didehydrotocopherol; and 4',4'a-11',12'-didehydrotocopherol, are useful intermediates in the preparation of Vitamin E.
These intermediates are prepared by reacting trimethylhydroquinone under acid catalysis with certain C.sub.20 intermediates, namely: ##STR1## where R represnts a 3,7-dimethyloctyl or a 3,7-dimethyl-6-octenyl radical and X is halogen, hydroxyl, acetate, C.sub.1-4 alkanoate, C.sub.3-4 alkenoate, aralkenoate and benzoate.

REFERENCES:
patent: 3346595 (1967-10-01), Folkers et al.
patent: 3789086 (1974-01-01), Frick et al.
patent: 4039591 (1977-08-01), Close et al.

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