Process for producing pyran

Details Process for producing pyran Process for producing pyran

2006-06-20

2006-06-20

Tsang, Cecilia J. (Department: 1625)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C549S427000

Reexamination Certificate

active

07064221

ABSTRACT:
This invention provides a process for producing a pyran efficiently with high productivity and simplified production facilities. The process for producing a pyran comprises reacting aldehyde (I) represented by:in-line-formulae description="In-line Formulae" end="lead"?R1—CHO  (I)in-line-formulae description="In-line Formulae" end="tail"?whereinis a single or double bond and R1represents an alkyl or alkenyl group having 1 to 12 carbon atoms, an optionally alkyl- or alkoxy-substituted aryl group having 6 to 12 carbon atoms in total, etc., to react isoprenol to produce pyran (II),wherein water in a reactor is maintained in an amount of 0.25 wt % or less while the conversion of that which has the lower charged total number of moles between aldehyde (I) and isoprenol is less than 50%.

REFERENCES:
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patent: 8-127577 (1996-05-01), None
patent: 11-29564 (1999-02-01), None

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