Chromene compound

A chromene compound represented by the following formula (1).

• wherein R1 is a hydroxyl group, alkyl group, haloalkyl group, cycloalkyl group, alkoxy group, amino group, heterocyclic group having a ring member nitrogen atom and bonded to a benzene ring, to which the heterocyclic group bonded via the nitrogen atom, cyano group, nitro group, formyl group, hydroxycarbonyl group, alkylcarbonyl group, alkoxycarbonyl group, halogen atom, aralkyl group, aralkoxy group, aryloxy group, aryl group, heteroaryl group, alkylthio group, cycloalkylthio group, arylthio group, heteroarylthio group or group having a siloxane bond, “a” is an integer of 0 to 4, when “a” is 2 to 4, a plurality of R1's may be the same or different, and two R1's may be bonded together to form a ring, R2 and R3 are each an alkyl group, aryl group, heteroaryl group, group represented by the following formula (2), or group represented by the following formula (3),
• wherein R4 is an aryl group or heteroaryl group, R5 is a hydrogen atom, alkyl group or halogen atom, and “m” is an integer of 1 to 3,
• wherein R6 is an aryl group or heteroaryl group, and “n” is an integer of 1 to 3.
• R2 and R3 may form an aliphatic ring together with carbon atoms to which R2 and R3 bonded, C* is a spiro carbon atom, a spiro ring A represented by the following formula is a saturated hydrocarbon ring or unsaturated hydrocarbon ring having 4 to 12 carbon atoms constituting the ring, and at least one ring member carbon atom constituting the spiro ring A is a group represented by the following formula (4),
• wherein R7 and R8 are each an alkyl group having 3 or more carbon atoms, aralkyl group, cycloalkyl group, aryl group or heteroaryl group, and X is a divalent group selected from alkylene group, alkynylene group, cycloalkylene group, arylene group and alkylene-arylene group.