Process for producing pyran
AssigneeKao Corporation
InventorsKazuki Naito, Koji Mine
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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: R1—CHO (I) wherein is a single or double bond and R1 represents 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%.
Claims9
A process for producing a pyran, which comprises reacting an aldehyde represented by the formula (I) (hereinafter, referred to as aldehyde (I)):
- R1—CHO (I)
- wherein R1 represents a hydrogen atom, an alkyl or alkenyl group having 1 to 12 carbon atoms, an optionally alkyl-substituted cycloalkyl group having 3 to 12 carbon atoms in total or an optionally alkyl- or alkoxy-substituted aryl group having 6 to 12 carbon atoms in total, with isoprenol to produce a pyran represented by the formula (II):
- wherein R1 has the same meaning as defined above, and is a single or double bond,
- 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%.
Dependencies are inferred from the claim text.