Processes for preparing tetrahydropyran-4-one and pyran-4-one

Details Processes for preparing tetrahydropyran-4-one and pyran-4-one Processes for preparing tetrahydropyran-4-one and pyran-4-one

2004-12-17

2010-06-29

Dentz, Bernard (Department: 1625)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

07745649

ABSTRACT:
The present invention relates to a process for preparing tetrahydropyran-4-one represented by the formula (1):which comprises reacting at least one kind of dihydropyran-4-one and pyran-4-one represented by the formula (2):whereinrepresents a single bond or a double bond,and hydrogen(a) in the presence of a metal catalyst, in a mixed solvent of an aprotic solvent and an alcohol solvent, or(b) in the presence of an anhydrous metal catalyst in which a hydrated metal catalyst is subjected to dehydration treatment, in a hydrophobic organic solvent.

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