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...

2008-07-15

2008-07-15

Gonzalez, P. Nazario (Department: 1621)

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

Organic compounds

Carboxylic acid esters

C548S400000, C549S255000, C564S123000, C564S152000, C564S160000, C568S013000, C568S063000, C568S398000, C568S459000, C554S127000

Reexamination Certificate

active

07399879

ABSTRACT:
A process for the preparation of a 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 carbonate of metal M or of a compound of formula MTjsuch as K2CO3or KHCO3

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