Cosmetic and pharmaceutical preparations comprising ascorbic...

Details Cosmetic and pharmaceutical preparations comprising ascorbic... Cosmetic and pharmaceutical preparations comprising ascorbic...

2006-09-05

2006-09-05

Owens, Amelia (Department: 1625)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C549S316000

Reexamination Certificate

active

07102019

ABSTRACT:
An ascorbic acid derivative of the formula Ia:where the variables independently of one another have the following meanings:R1and R2independently of one another are hydrogen or C1-C20-acyl;R3is hydrogen or a cation selected from the group consisting of NH4+, alkali metal and alkaline earth metal cations;R4is C1-C6-alkoxycarbonyl,and a process for its preparation.

REFERENCES:
patent: 2980702 (1961-04-01), Thesing et al.
patent: 6346254 (2002-02-01), Streicher et al.
Tanaka, H. et al ‘5,6-Isopropylideneascorbic Acid Derivatives’ CA 73:99173 (1970).

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