2,5-bis(1,1-dialkoxy-2-propyl)-2,5-dihydrofurans, the preparatio

Details 2,5-bis(1,1-dialkoxy-2-propyl)-2,5-dihydrofurans, the preparatio 2,5-bis(1,1-dialkoxy-2-propyl)-2,5-dihydrofurans, the preparatio

1993-05-27

1995-01-17

Pal, Asok

Chemistry of hydrocarbon compounds

Alicyclic compound synthesis

Carotene or derivative

C07C40306

Patent

active

053827325

ABSTRACT:
A process of preparing symmetric C.sub.40 -carotenoids by reacting a C.sub.15 -triphenylphosphonium salt of the formula ##STR1## and a 2,5-bis(1,1-dialkoxy-2-propyl)-2,5-dihydrofuran to form a reaction product containing a diacetyl and a triphenylphosphonium salt, adding a strong base to the reaction product to convert the triphenylphosphonium salt to a carbenium ion, hydrolyzing the diacetyl to a dialdehyde, subjecting the dialdehyde and the carbenium ion to a Wittig reaction to prepare a Wittig reaction product, and converting the Wittig reaction product to the C.sub.40 -carotenoid by acid treatment.

REFERENCES:
patent: 2750418 (1956-06-01), Clauson-Kaas
patent: 3634518 (1972-01-01), Buddrus
patent: 4105855 (1978-08-01), Schulz et al.
patent: 4916250 (1990-04-01), Babler
patent: 5110423 (1992-05-01), Little et al.

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