Antiviral compositions containing bis-basic ketones of xanthene and
申请人:Richardson-Merrell Inc.
公开号:US03957989A1
公开(公告)日:1976-05-18
Novel bis-basic ketones of xanthene and xanthen-9-one have antiviral activity when administered orally and parenterally. The compounds are represented by the following formula: ##SPC1## Wherein Z is oxygen or H.sub.2 ; each A is a straight or branched alkylene chain having from 1 to about 6 carbon atoms; and each Y is A. the group ##EQU1## wherein R.sup.1 and R.sup.2 are individually hydrogen, lower alkyl having from 1 to about 6 carbon atoms, cycloalkyl having from 3 to 6 carbon atoms, alkenyl of from 3 to 6 carbon atoms and having the vinyl unsaturation in other than the 1-position of the alkenyl group; or B. the group ##EQU2## WHEREIN N IS A WHOLE INTEGER FROM 4 TO 6, AND R.sup.3 is hydrogen, lower alkyl of from 1 to about 4 carbon atoms and can be linked to any one of the carbon atoms of the heterocyclic group; or C. the group ##EQU3## wherein X is oxygen or NR.sup.4, and R.sup.4 is hydrogen or lower alkyl of from 1 to about 4 carbon atoms; Or a pharmaceutically acceptable acid addition salt thereof. These compounds can be prepared by several different methods.
Photosensitive compositions containing carbonylic halides as activators
申请人:Dynachem Corporation
公开号:EP0005379A2
公开(公告)日:1979-11-14
Compositions containing a polymerizable, curable or crosslinkable component. a photoinitiator, a colorformer capable of changing color upon contact with a suitable activator and a latent activator containing an organic halide will become insoluble and change color under the influence of actinic radiation. The organic halide is a carbonylic compound such as an aliphatic or cycloaliphatic ketone or an ester or amide of a dicarboxylic acid. The compositions are useful to make resists used in the electronics industry to manufacture printed circuits.
Phototropic photosensitive compositions containing a fluoran colorformer
申请人:Dynachem Corporation
公开号:EP0005380A2
公开(公告)日:1979-11-14
Compositions containing a polymerizable, curable or crosslinkable component, a photoinitiator, a fluoran colorformer and a latent activator that releases or promotes the release of a Lewis acid, will become insoluble and change color under the influence of actinic radiation. These compositions are particularly useful to make dry film photoresists, which are widely used in the electronics industry to manufacture printed circuits.
Rh-catalyzed direct synthesis of 2,2′-dihydroxybenzophenones and xanthones
作者:Maddali L. N. Rao、Boddu S. Ramakrishna
DOI:10.1039/c6ra18647e
日期:——
An efficient rhodium-catalyzed direct synthesis of 2,2′-dihydroxybenzophenones and xanthones was developed from functionalized salicylaldehydes. This approach provides an easy access to various functionalized 2,2′-dihydroxybenzophenone and xanthone core skeletons. This study also revealed the crucial role of the hydroxy group in the reductive homo-coupling process to generate 2,2′-dihydroxybenzophenones