Epoxybenzopyrans
US5075460A · kind A · utility
0Cited by
16References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1989 |
| Grant date | Dec 24, 1991 |
| Priority date | — |
| Expiry date | Dec 6, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D405/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A compound of the formula ##STR1## wherein: one of R.sub.1 and R.sub.2 is hydrogen or C.sub.1-4 alkyl and the other is C.sub.1-4 alkyl or R.sub.1 and R.sub.2 together are C.sub.2-5 polymethylene; and R'.sub.4 is ethyl, isopropyl, t-butyl or cyclopentyl.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.