Patent 5616733 Issued on April 1, 1997. Estimated Expiration Date: June 7, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Preparation process for 2-coumaranone in which glyoxylic acid, in vapor phase, is reacted with cyclohexanone, in the presence of a dehydrogenation catalyst.
Other References
Mondon et al, Neue Abkommlinge der Cyclohexanon-(1)-essigsaure-(2)' Chemische Berichte, vol. 96, pp. 826-839, 1963
T. Fukagawa et al, Palladium-Promoted Intramolecular Aromatic Nuclear Actloxylation: Preparation of 2-Coumaranone, The Journal of Organic Chemistry, vol. 47, No. 12, pp. 2491-2493, Jun. 4, 198
June 7, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
