Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2005-01-28
2009-11-10
Dentz, Bernard (Department: 1625)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C549S407000, C549S408000
Reexamination Certificate
active
07615650
ABSTRACT:
The invention provides a process for producing a chroman compound represented by formula (1), characterized in that the process includes allowing a phenol, an unsaturated compound, and a formaldehyde to react in the absence of catalyst and in the presence of water in an amount by mole 1 to 10 times that of the phenol.According to the present invention, a high-purity chroman compound can be produced in the absence of catalyst and under mild conditions. In addition, the invention provides an industrial means for producing the compound, without using a large amount of an acid or a base serving as a reaction promoter or a catalyst, which would otherwise cause side reactions, apparatus corrosion, etc.
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Giancarlo Cravotto, et al., The Reactivity of 4-Hydroxycoumarin under Heterogeneous High-Intensity Sonochemical Conditions, Synthesis 2003, No. 8, pp. 1286-1291.
Supplementary European Search Report dated Feb. 16, 2009, for Application No. EP 05 70 4261.
Hidaka Toshio
Kyuuko Youichi
Tanaka Kazuo
Antonelli, Terry Stout & Kraus, LLP.
Dentz Bernard
Mitsubishi Gas Chemical Company Inc.
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