Compound, photopolymerization initiator, photocurable composition and cured product thereof, and photocurable ink and print using the same

A compound, characterized in that it is represented by general formula (1):

• wherein in formula (1), R1 and R2 each independently represent an alkyl group, an aryl group, or an alkoxy group;
• R3 to R5 each independently represent a hydrogen atom, an alkyl group having a carbon atom number of 1 to 4, or an alkoxy group having a carbon atom number of 1 to 4;
• X1 represents an optionally branched alkylene group having a carbon atom number of 1 to 6;
• and X2 represents a bonding group represented by general formulas (2) to (4),
• n represents an integer of 1 to 6;
• when n is an integer of 1, Y represents an aryl group, a structural moiety (y-3) represented by formula (y-3), a structural moiety (y-5) represented by formula (y-5), a structural moiety (y-8) represented by formula (y-8), a structural moiety (y-9) represented by formula (y-9);
• and when n is an integer of 2 to 6, Y represents a 2- to 6- valent linking group,
• wherein in formula (y-3), R6 represents an alkylene group having a carbon atom number of 2 to 4;
• R7 represents a hydrogen atom or a phenyl group or an alkyl group having a carbon atom number of 1 to 4;
• and m represents an integer of 1 to 20,
• wherein in formula (y-5), R8 represents an alkylene group having a carbon atom number of 1 to 18 or an arylene group having a carbon atom number of 6 to 18;
• and R9 represents an alkyl group having a carbon atom number of 1 to 18 or an aryl group having a carbon atom number of 6 to 18,
• wherein in formula (y-8), R6 represents an alkylene group having a carbon atom number of 2 to 4;
• R12 represents a hydrogen atom or a methyl group;
• and 1 represents an integer of 2 to 20,
• wherein in formula (y-9), R7 represents an alkylene group having a carbon atom number of 1 to 18;
• and R12 represents a hydrogen atom or a methyl group.