Process for preparing polyenedialdehyde monoacetals

Details Process for preparing polyenedialdehyde monoacetals Process for preparing polyenedialdehyde monoacetals

2006-05-16

2006-05-16

Solola, Taofiq (Department: 1626)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C549S453000, C568S460000

Reexamination Certificate

active

07045641

ABSTRACT:
A process for preparing compounds of the formula Iis described and entails converting a compound of the formula IIby Wittig or Wittig-Horner reaction into a compound of the formula IV,where appropriate converting the compound of the formula IV by hydrolysis of the acetal function and Wittig or Wittig-Horner reaction into a compound of the formula VIand converting the compound of the formula IV or VI in two stages into the compound of the formula I. The radicals R1, R2and R6and k have the meaning indicated in the description. Novel intermediates are also described.

REFERENCES:
patent: 4268444 (1981-05-01), Jaedicke
patent: 2002/0128519 (2002-09-01), Ernest et al.
Hagen et al. “Synthesis of Donor-Acceptor Substituted Polyenes” Synthetic Metals vol. 41-43 (1991) pp. 1557-1561.
Chopra et al. “Synthesis of the Enolic β-Diketrone Carotenoids, Mytiloxanthin and Trikentriofhodin” J.C.S. Chem. Comm. (1977) pp. 467-468.
Chopra et al. “Carotenoids and Related Compounds. Part 41 Structure of Mytiloxanthin and Synthesis of a cis Isomer” J. Chem. Soc. Perkin. Trans. (1988) pge 1383-1388.
Hansgeorg Ernst “Recent advances in industrial carotenoid synthesis” Pure Appl. Chem. vol. 74, No. 11, (2002) pp. 2149-2162.

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