[2-(4-Oxo-4H-1-benzopyran-2-yl)ethenyl]benzonitriles and benzoic acids
US4033845A · kind A · utility
7Cited by
5References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1975 |
| Grant date | Jul 5, 1977 |
| Priority date | — |
| Expiry date | Nov 20, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D311/22
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to [2-(4-oxo-4H-1-benzopyran-2-yl)ethenyl]benzonitrile and benzoic acids having the following structural formula: ##STR1## in which R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 are hydrogen, lower alkyl, halogen or lower alkoxy, and A is COOH or CN. The compounds of this invention exhibit anti-allergy properties and are indicated in the management of allergic manifestations such as bronchial asthma.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.