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公开(公告)号：DE69736018D1
公开(公告)日：2006-07-06
申请号：DE69736018
申请日：1997-11-26
Applicant: KAO CORP
Inventor： YAMAMURO HOTAKA , IHARA TAKESHI , KITSUKI TOMOHITO , MIYAJIMA TETSUYA , YAMATO FUJIO , KOHAMA MAKOTO
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公开(公告)号：DE69733524T2
公开(公告)日：2006-05-11
申请号：DE69733524
申请日：1997-09-29
Applicant: KAO CORP
Inventor： NISHIOKA TOHRU , TANAKA SHIGEYOSHI , KOSHINO JUNJI , YAMASHITA OSAMU , OZAWA TADAHIRO , KOHAMA MAKOTO
IPC: C07D309/18
Abstract: To provide a simple process for economically preparing a dihydropyrane compound at a high productivity and a high reaction yield. To use a compound selected from the group consisting of a base and a compound (VIII) having a weaker coordination power to the Lewis acid than the aldehyde compound and having an activity to dissolve the Lewis acid, coordinated by the compound (VIII), in a solvent as a co-catalyst in reacting aldehyde with a diene compound in the presence of a Lewis acid to prepare a 5,6-dihydro-2H-pyrane compound represented by formula (III): in which R represents a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, aryl group which may be substituted with alkyl group, having 6 to 12 total carbon atoms; R and R represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
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公开(公告)号：DE69716580T2
公开(公告)日：2003-06-05
申请号：DE69716580
申请日：1997-11-26
Applicant: KAO CORP
Inventor： YAMAMURO HOTAKA , IHARA TAKESHI , KITSUKI TOMOHITO , MIYAJIMA TETSUYA , YAMATO FUJIO , KOHAMA MAKOTO
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公开(公告)号：DE69716580D1
公开(公告)日：2002-11-28
申请号：DE69716580
申请日：1997-11-26
Applicant: KAO CORP
Inventor： YAMAMURO HOTAKA , IHARA TAKESHI , KITSUKI TOMOHITO , MIYAJIMA TETSUYA , YAMATO FUJIO , KOHAMA MAKOTO
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