| 摘要 |
<p>1349503 Tetrachlorophthalide compounds NATIONAL CASH REGISTER CO 18 April 1972 [27 April 1971] 17820/72 Heading C4P [Also in Division D2] The invention comprises compounds of the general formula wherein each R is an alkyl-, phenyl-, phenylalkyl- or alkoxy substituted or unsubstituted p-aminophenyl, pyrrol-2-yl or indol-3-yl group; the alkyl groups containing 1 to 4 carbon atoms. The compounds are prepared in specific examples by condensing a benzophenone compound with a pyrrole, indole or m-toluidine, or a benzoyl indole compound with a m-phenetidine. The compounds are used in pressure sensitive recording materials.</p> |
