Photochromic cyclic compound and curable composition containing the photochromic cyclic compound

A photochromic cyclic compound represented by Formula (1) below:

• in the formula,
• PC denotes a divalent T-type photochromic basic structural group, L denotes a divalent bridging group, and n is an integer of 1 or more,
• the PC to denote the T-type photochromic basic structural group is a naphthopyran structural group represented by Formula (2) below:
• in Formula (2),
• provided that at least one of R3 and R4 is a bonding hand to the divalent bridging group L or a group having the bonding hand,
• R1 and R2 are each a group having a bonding hand to the divalent bridging group L or a group having the bonding hand, a hydroxyl group, an alkyl group, a cycloalkyl group, an alkoxy group, an amino group, a heterocyclic group, a cyano group, a halogen atom, an alkylthio group, an arylthio group, a nitro group, a formyl group, a hydroxycarbonyl group, an alkylcarbonyl group, an alkoxycarbonyl group, an aralkyl group, an aralkoxy group, an aryloxy group, an aryl group, a heteroaryl group, a thiol group, an alkoxyalkylthio group, a cycloalkylthio group, a group represented by Formula (X) below, or a group represented by Formula (Y) below:
• in the Formula (X),
• E is an oxygen atom or NR101, and R101 is a hydrogen atom or an alkyl group,
• F is an oxygen atom or a sulfur atom,
• G is an oxygen atom, a sulfur atom or a NR202, and R202 is a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a heteroaryl group,
• g is an integer of 0 or 1,
• R201 is a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a heteroaryl group,
• in a case where G is an oxygen atom or a sulfur atom, R201 is a group other than a hydrogen atom;
• in the Formula (Y),
• R300 is an alkylene group, or a silylene group having as a substituent an alkyl group or an aryl group,
• R301 is an alkyl group or an aryl group,
• R302, R303 and R304 are alkylene groups,
• h, j, k and l are integers of 0 or 1,
• i is an integer of 2 to 200, and the plural units of i may be expressed in the same or different units, or
• R1 and R2 may together form a ring that may have a heteroatom,
• a is an integer of 0 to 2, and b is an integer of 0 to 4,
• when a is 2, two R1 may be different from each other, and in a case where a is 2 and two R1 are present adjacent to each other, the two R1 may together form a ring that may have a heteroatom,
• in a case where b is 2 to 4, a plurality of R2 may be different from each other, and in a case where b is 2 to 4 and two R2 are present adjacent to each other, the adjacent two R2 may together form a ring that may have a heteroatom,
• R3 and R4 are each a bonding hand to the divalent bridging group L or a group having the bonding hand, an aryl group or a heteroaryl group, and the divalent bridging group L is a group represented by Formula (3) below:
• —R8—R9—R10— (3)
• in Formula (3),
• provided that not all of R8, R9 and R10 become direct bonds at the same time,
• R8 and R10 are each either a direct bonding hand or a divalent aromatic ring group having 6 to 30 carbon atoms, and at least either R8 or R10 is a p-phenylene group, and
• R9 is a direct bonding hand or a divalent organic group.