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US 11,292,757 B2Granted
Synthesis of cyclopentenones
AssigneeDow Global Technologies LLC
InventorAngela I. Padilla-Acevedo
Life of this patent
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Abstract
A method comprising synthesizing a substituted cyclopentenone compound via reaction of a substituted cycloalkyl acrylate ester in the presence of phosphorous pentoxide/methanesulfonic acid reagent to make the substituted cyclopentenone compound.
Claims5
A method of synthesizing a substituted cyclopentenone compound, the method comprising (A) contacting a compound of formula (1) (“compound (1)”):
- wherein subscript n is 1, 2, 3, or 4;
- and each of groups R1, R2, R3, and R4 is independently H or (C1-C4)alkyl, or any two adjacent R1 to R3 groups are bonded together to form a (C1-C4)alkylene and the remaining group of R1 to R3 is H or (C1-C4)alkyl, with an effective amount of a phosphorous pentoxide/methanesulfonic acid reagent (P2O5/H3CSO3H reagent) and under reaction conditions sufficient to make a compound of formula (2) (“compound (2)”):
- wherein subscript n and groups R1 to R4 are as defined above;
- and with the proviso that the contacting step (A) is free of added polyphosphoric acid (PPA).
1 more element
Dependencies are inferred from the claim text.