Abstract: Trifluoroanisoles of the formula ##STR1## where m is 1 or 2 and n is 0 to 3, are prepared by reacting hydrogen fluoride with trichloroanisoles of the formula ##STR2## in the vapor phase, in the presence of a fluorinated alumina catalyst whereinX is halogen other than fluorine;R is aryl, preferably 1 to 14 carbon atoms, halogen substituted aryl, halogen, alkyl of 1 to 6 carbon atoms, or alkoxy of 1 to 6 carbon atoms;m is 1 or 2;n is 0 to 3;w is 0 to 2;p is 1 to 3;q is 0 to 2;w+p+q is 3;w' is 1 to 3 and is greater than w;p' is 0 to 2 and is less than p;q' is 0 to 2 and is equal to q; andw'+p'+q' is 3.

Abstract: Disclosed are normally substantially colorless chromogenic 2-phenyl-1,2,3-triazolofluoran color precursor compounds having the following generic structural formula: ##STR1## wherein each R.sub.1 represents either a hydrogen atom or a lower alkyl group having from one to five carbon atoms and wherein R.sub.2 preferably represents either a hydrogen atom, a substituted or unsubstituted lower alkyl group having from one to five carbon atoms or a substituted or unsubstituted phenyl group. These compounds are generally substantially colorless but capable of becoming highly colored when brought into reactive contact with many conventional Lewis acid materials. Accordingly, these compounds are highly useful as a component of pressure-sensitive copying papers.

Abstract: Disclosed are normally substantially colorless chromogenic 3'-amino-6' or 7'-(pyrazol-1-yl)fluoran color precursor compounds having the following generic structural formula: ##SPC1##Wherein each R.sub.1 represents either a hydrogen atom or a lower alkyl group having from one to five carbon atoms; wherein each R.sub.2 represents either a hydrogen atom, a substituted or unsubstituted lower alkyl group having from one to five carbon atoms or a substituted or unsubstituted phenyl group; and wherein the pyrazolyl group is attached to the fluoran moiety at either the 6' position or the 7' position of the latter. These compounds are generally substantially colorless but capable of becoming highly colored when brought into reactive contact with many conventional Lewis acid materials. Accordingly, these compounds are highly useful as a component of pressure-sensitive copying papers.