Process for preparing alkylidene-substituted-1, 4-dions...

Details Process for preparing alkylidene-substituted-1, 4-dions... Process for preparing alkylidene-substituted-1, 4-dions...

2003-07-09

2008-12-16

Zucker, Paul A (Department: 1621)

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

Organic compounds

Carboxylic acid esters

Reexamination Certificate

active

07465821

ABSTRACT:
A process for the preparation of an monoalkylidene substituted 1,4-dions derivatives of formula (Ia) or (Ib) or a mixture of (Ia) and (Ib): wherein: R1, R2and R3, equal to or different from each other, are hydrogen atoms or C1-C20hydrocarbon groups: T1and T2, equal to or different from each other, are OR4. R4, NR42, SR4or PR42; or T1and T2can be fused in an oxygen atom or a NR4group; said process comprises the step of reacting a compound of formula (II), with a compound of formula (IIIa) or (IIIb), in the presence of at least one equivalent with respect to the compound of formula (IIIa) or (IIIb) of a salts of a base or a neutral base at a temperature higher than 70° C.

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