JPS5540637A - Preparation of chromene - Google Patents
Preparation of chromeneInfo
- Publication number
- JPS5540637A JPS5540637A JP11407578A JP11407578A JPS5540637A JP S5540637 A JPS5540637 A JP S5540637A JP 11407578 A JP11407578 A JP 11407578A JP 11407578 A JP11407578 A JP 11407578A JP S5540637 A JPS5540637 A JP S5540637A
- Authority
- JP
- Japan
- Prior art keywords
- alkoxy
- alkylchromene
- alkoxyphenol
- reacting
- prepared
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To prepare an alkoxy-2-alkylchromene useful as an insecticide, in high yield and at a low cost, by the dehydrogenation of alkoxy-2-alkylcuromane prepared by reacting an alkoxyphenol with a conjugated diene.
CONSTITUTION: An alkoxy-2-alkylchromene of formula III (R1,2 are alkoxy or H, provided that at least one of R1 and R2 is alkoxy; R3 is alkyl; R4 is H or hydrocarbon), is prepared without using a complicated process or special reaction reagent, by reacting an alkoxyphenol I with a conjugated diene in the presence of an acid catalyst such as sulfuric acid, and dehydrogenating the resulting alkoxy-2-chromane II with a dehydrogenating agent such as dichlorodicyanobenzoquinone. 7-Methoxy- 2, 2-dimethylchromene, etc. have antagonistic activity against juvenile hormone of insects such as Hemiptera, etc., and are expected as effective insecticides.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11407578A JPS5540637A (en) | 1978-09-19 | 1978-09-19 | Preparation of chromene |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11407578A JPS5540637A (en) | 1978-09-19 | 1978-09-19 | Preparation of chromene |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5540637A true JPS5540637A (en) | 1980-03-22 |
Family
ID=14628411
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11407578A Pending JPS5540637A (en) | 1978-09-19 | 1978-09-19 | Preparation of chromene |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5540637A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4677537A (en) * | 1984-09-20 | 1987-06-30 | Mitsubishi Denki Kabushiki Kaisha | Converter device |
US4716238A (en) * | 1983-02-15 | 1987-12-29 | Alkaloida Vegyeszeti Gyar | Chromene derivatives useful as insecticides |
US4866089A (en) * | 1983-02-16 | 1989-09-12 | Alkaloida Vegyeszeti Gyar | Chromene derivatives and pesticidal composition comprising the same |
WO1996009298A1 (en) * | 1994-09-20 | 1996-03-28 | Industrie Chimiche Caffaro S.P.A. | Method for preparing coumarin and derivatives thereof |
CN102887882A (en) * | 2012-10-15 | 2013-01-23 | 柳忠全 | Synthesis method of precocene and analogs thereof |
-
1978
- 1978-09-19 JP JP11407578A patent/JPS5540637A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4716238A (en) * | 1983-02-15 | 1987-12-29 | Alkaloida Vegyeszeti Gyar | Chromene derivatives useful as insecticides |
US4866089A (en) * | 1983-02-16 | 1989-09-12 | Alkaloida Vegyeszeti Gyar | Chromene derivatives and pesticidal composition comprising the same |
US4677537A (en) * | 1984-09-20 | 1987-06-30 | Mitsubishi Denki Kabushiki Kaisha | Converter device |
WO1996009298A1 (en) * | 1994-09-20 | 1996-03-28 | Industrie Chimiche Caffaro S.P.A. | Method for preparing coumarin and derivatives thereof |
CN102887882A (en) * | 2012-10-15 | 2013-01-23 | 柳忠全 | Synthesis method of precocene and analogs thereof |
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