PHOTOGRAPHIC SENSITISERS. PART II. MEERO-DI- AND -TRI-CARBOCYANINES

Quaternary methiodides of some 4-substituted 2-methylthiazoles have been condensed with ß-anilinoscrolein anil hydrochloride and glutaconic aldehyde dianilide hydrochloride. The resulting acetanilidovinyl compounds have been prepared to study the shifts in absorption with each vinyl group addition. These reactive intermediates have also been condensed with ketomethylene compounds, yielding the corresponding mero-di- and -tri-carbocyanines