Herbicidal 12-substituted 12H-dibenzo[d,g][1,3]dioxocin-6-carboxylic acids
US5071465A · kind A · utility
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Key dates
| Filing date | Apr 12, 1990 |
| Grant date | Dec 10, 1991 |
| Priority date | — |
| Expiry date | Apr 12, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01N43/24
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Dibenzo[d,g][1,3]dioxocin-6-carboxylic acids substituted by methyl or ethyl or a moiety --CH.sub.2 CH.sub.2 -- at the 12-position and optionally substituted at other positions, such as methyl 4'-chlorospiro(cyclopropane-1,12'(12'H)-dibenzo[d,g][1,3]dioxocin)-6'-carb oxylic acid, and their agriculturally acceptable esters, amides, and salts are useful for the control of undesirable vegetation. The 1,1-diarylcyclopropane intermediates required for the spirocyclopropane compounds can be prepared from appropriately substituted 1,1-diarylethene procursors by reaction with phenylthiomethyl lithium reagent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.