| 摘要 |
PROBLEM TO BE SOLVED: To provide a novel &pgr;-electron compound suitable for observing with naked eyes a hardening process of a chemical such as an adhesive which changes from a liquid to a solid.SOLUTION: Provided is a &pgr;-electron compound represented by the following formula (1). In the formula (1), R represents an alkyl group having a branch or a phenyl group provided with the same or mutually different alkyl groups at at least 2- and 6-positions. This &pgr;-electron compound is applicable as a main component of a hardening reaction visualizing agent for observing with naked eyes a hardening process of a liquid containing one or two or more of ketones, acetate esters, alcohols, and cycloalkanes as a solvent. |
