Organic compounds -- part of the class 532-570 series – Organic compounds – Phosphorus esters
Reexamination Certificate
2006-09-26
2006-09-26
Witherspoon, Sikarl A. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Phosphorus esters
C568S015000
Reexamination Certificate
active
07112692
ABSTRACT:
A method for making β-ketophosphonates by reacting a trialkyl phosphonocarboxylate (such as triethyl phosphonoacetate) with an acyl halide (such as acetyl chloride) in a reaction involving ester formation, followed by decarboxylation, followed by purification. The reaction is run in a single solvent, which is not removed from the reaction mixture until the purification stage. Suitable solvents for this purpose include halogenated aromatic hydrocarbons (such as mono-chlorobenzene).
REFERENCES:
Kim et al.: J. Chem. Soc. Perkin Trans. 1, vol. 9, 1997, pp. 1361-1363, XP009000481.
Kim et al.: Synth. Commun., vol. 29, No. 8, 1999, pp. 1271-1275, XP001119775.
Corbel et al.: Synth. Commun., vol. 30, No. 4, 2000, pp. 609-618, XP001119776.
Harris Christopher John
Salter Julie Ann
Smith Alan Craig
Frishauf Holtz Goodman & Chick P.C.
Rhodia Consumer Specialties Limited
Witherspoon Sikarl A.
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