Chromogenic propenylenesulfone compounds

Abstract From the Canadian patent

Chromogenic compounds of the formula (1A), or, (1B), wherein each of Y1 and Y2 independently represents an aminosubstituted phenyl radical of the formula (1a), a 3-indolyl radical of the formula (1b), or, - 2 -, a 3-carbazolyl radical of the formula (1c), and Q represents alkyl of 1 to 12 carbon atoms or unsubstituted or substituted aryl or aralkyl whilst each, of X1 and X2 independently represents hydrogen alkyl, containing not more than 12 carbon atoms which is unsubstituted or substituted by halogen hydroxyl, cyano, or lower alkoxy. or represents cycloalkyl phenyl, benzyl, or phenyl or benzyl which is substituted by halogen lower, alkyl or lower alkoxy, or X1 and X2 together with the …