Xanthene compounds
AssigneePolaroid Corporation
InventorsRichard L. Cournoyer, James W. Foley
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Abstract
The present invention is concerned with novel xanthene compounds of the formulae ##STR1## and ##STR2## wherein each R.sup.1 the same or different is alkyl or benzyl; each R.sup.2 the same or different is an electron-withdrawing group having a positive sigma value greater than 0.6; R.sup.3 is hydrogen or alkyl; R.sup.4 is alkyl; and n is 0 or 1, said R.sup.2 group being ortho, meta or para to said N atom. The subject compounds are useful as light-screening dyes in photographic products and processes.
Claims12
A compound of the formula ##STR50## and ##STR51## wherein each R.sup.1 the same or different is alkyl containing 1 to 7 carbon atoms or benzyl, each R.sup.2 the same or different is an electron-withdrawing group having a positive sigma value greater than 0.6;
- R.sup.3 is hydrogen or alkyl containing 1 to 4 carbon atoms;
- R.sup.4 is alkyl containing 1 to 4 carbon atoms;
- and n is 0 or 1, said R.sup.2 group being ortho, meta or para to said N atom.
The compound ##STR52##
The compound ##STR53##
The compound ##STR54##
The compound ##STR55##
The compound ##STR56##
Dependencies are inferred from the claim text.