Process for preparing alkylidene-substituted-1, 4-dions derivatives
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United States of America Patent
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Dec 16, 2008
Grant Date -
Apr 14, 2005
app pub date -
Jul 9, 2003
filing date -
Aug 5, 2002
priority date (Note) -
Expired
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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: R.sup.1, R.sup.2 and R.sup.3, equal to or different from each other, are hydrogen atoms or C.sub.1-C.sub.20 hydrocarbon groups: T.sup.1 and T.sup.2, equal to or different from each other, are OR.sup.4. R.sup.4, NR.sup.4.sub.2, SR.sup.4 or PR.sup.4.sub.2; or T.sup.1 and T.sup.2 can be fused in an oxygen atom or a NR.sup.4 group; 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.degree. C. ##STR00001##
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