Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1993-03-19
1993-12-07
Prescott, Arthur C.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
562400, 562405, 562495, 562503, C07C 51353, C07C 5704
Patent
active
052685063
ABSTRACT:
An .alpha., .beta.-unsaturated carboxylic acid is produced by catalytically reacting an .alpha.-hydroxycarboxylic acid amide of the formula (1), ##STR1## where R.sub.1 and R.sub.2 are independently selected from the group consisting of hydrogen and C.sub.1 -C.sub.4 alkyl groups, provided that at least one of R.sub.1 and R.sub.2 is the alkyl group, with water in the presence of a solid acid catalyst containing a high surface area rare earth phosphate anhydride having the monoclinic system structure producible by heating a rare earth phosphate of the hexagonal system structure at 60.degree.-200.degree. C. in a solution of an inorganic acid, an inorganic acid salt and/or an inorganic acid ester where the molar ratio of the inorganic acid component to the rare earth phosphate of the hexagonal system structure is 0.5-400.
REFERENCES:
patent: 4464539 (1984-08-01), Hashimoto et al.
patent: 4990662 (1991-02-01), Hagen et al.
patent: 5068399 (1991-11-01), Naito et al.
patent: 5102849 (1992-04-01), Kemp et al.
Hiraiwa Takeshi
Inomata Masamitsu
Kageyama Hiroharu
Karasawa Minato
Miyama Kanemitsu
Mitsui Toatsu Chemicals Incorporated
Prescott Arthur C.
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