Process for the preparation of...

Details Process for the preparation of... Process for the preparation of...

2008-01-22

2008-01-22

Witherspoon, Sikarl A. (Department: 1621)

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

Organic compounds

Oxygen containing

C568S392000

Reexamination Certificate

active

11692839

ABSTRACT:
The present invention relates to a process for the preparation of compounds of a 1,4-dialkyl-2,3-diol-1,4-butanedione by a catalytic aldol condensation between an alkyl glyoxal and an α-hydroxy ketone.

REFERENCES:
patent: 4234518 (1980-11-01), Yoshida et al.
patent: 474 465 (1969-08-01), None
George Buchi et al., “Syntheses of 2,5-Dimethyl-4-hydroxy-2,3-dihydrofuran-3-one (Furaneol), a Flavor Principle of Pineapple and Strawberry”, J. Org. Chem., vol. 38, No. 1, pp. 123-125 (1978).
Luciano Bassignani et al., “Novel Applications of the Potassium Chlorate Osmium Tetroxide Oxidizing System. Synthesis of α-Diearbonyl Derivatives from Acetylenic Compounds. Synthesis of a 2,3-Dihydroxy-1,4-dione from a 2,5-Dialkylfuran”, J. Org, Chem., vol. 43, No. 21, pp. 4245-4247 (1978).
Mark A. Briggs et al., “Synthesis of 4-Hydroxy-2,5-dimethylfuran-3(2H)-one (Furaneol) from (2R,3R)-tartaric Acid”, Journal of Chem. Soc. Perkin Trans. 1, pp. 795-798 (1985).
A.M.B.S.R.C.S. Costa et al., “Lithiationin Flavones, Chromones, Coumarins, and Venzofuran Derivatives”, , J. Chem. Soc. Perkin Trans 1, pp. 799 (1985).

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