Fluorene-type compound, photopolymerization initiator comprising said fluorene-type compound, and photosensitive composition containing said photopolymerization initiator

A fluorene-based compound, which is represented by the general formula (1):

• in the general formula (1):
• when m represents 0 and n represents 0, R1 represents a hydrogen atom, a halogen atom, a nitro group, a sulfonyloxy group substituted with an alkyl group having 1 to 8 carbon atoms that may be substituted with a halogen atom, a phenylsulfonyloxy group that may be substituted, a sulfonyl group substituted with an alkyl group having 1 to 8 carbon atoms that may be substituted with a halogen atom, a phenylsulfonyl group that may be substituted, a heterocyclic sulfonyl group that may be substituted, or a condensed ring sulfonyl group that may be substituted, when m represents 0 and n represents 1, R1 represents a phenyl group that may be substituted, a heterocyclic group that may be substituted, or a condensed ring group that may be substituted, and when m represents 1 and n represents 1, R1 represents a sulfonyloxy group substituted with an alkyl group having 1 to 8 carbon atoms that may be substituted with a halogen atom, or a phenylsulfonyloxy group that may be substituted;
• R2 and R3 each independently represent a hydrogen atom, a linear, branched, or cyclic alkyl group having 1 to 22 carbon atoms, a linear or branched halogenated alkyl group having 1 to 10 carbon atoms, or a linear or branched alkyl group having 2 to 15 carbon atoms interrupted by one or more ether bonds or thioether bonds, and R2 and R3 may form a ring together;
• wherein the R4 represents a group represented by the formula (3):
• in the formula (3), R5′ represents a linear, branched, or cyclic alkyl group having 1 to 17 carbon atoms, a linear or branched halogenated alkyl group having 2 to 5 carbon atoms, a linear or branched alkyl group having 2 to 7 carbon atoms interrupted by one or more ether bonds or thioether bonds, a phenyl group that may be substituted, a phenylalkyl group having 7 to 11 carbon atoms that may be substituted, a phenoxyalkyl group having 7 to 10 carbon atoms that may be substituted, a heterocyclic group that may be substituted, or a condensed ring group that may be substituted, and the R7 represents a linear, branched, or cyclic alkyl group having 1 to 6 carbon atoms, a linear or branched halogenated alkyl group having 1 to 4 carbon atoms, a phenyl group that may be substituted, a phenylalkyl group having 7 to 10 carbon atoms that may be substituted, a phenylalkyl group having 7 to 9 carbon atoms that is interrupted by one or more ether bods or thioether bonds and may be substituted, a condensed ring group that may be substituted, or a heterocyclic group that may be substituted.

A fluorene-based compound, which is represented by the general formula (1):

• in the general formula (1):
• when m represents 0 and n represents 0, R1 represents a hydrogen atom, a halogen atom, a nitro group, a sulfonyloxy group substituted with an alkyl group having 1 to 8 carbon atoms that may be substituted with a halogen atom, a phenylsulfonyloxy group that may be substituted, a sulfonyl group substituted with an alkyl group having 1 to 8 carbon atoms that may be substituted with a halogen atom, a phenylsulfonyl group that may be substituted, a heterocyclic sulfonyl group that may be substituted, or a condensed ring sulfonyl group that may be substituted, when m represents 0 and n represents 1, R1 represents a phenyl group that may be substituted, a heterocyclic group that may be substituted, or a condensed ring group that may be substituted, and when m represents 1 and n represents 1, R1 represents a sulfonyloxy group substituted with an alkyl group having 1 to 8 carbon atoms that may be substituted with a halogen atom, or a phenylsulfonyloxy group that may be substituted;
• R2 and R3 each independently represent a hydrogen atom, a linear, branched, or cyclic alkyl group having 1 to 22 carbon atoms, a linear or branched halogenated alkyl group having 1 to 10 carbon atoms, or a linear or branched alkyl group having 2 to 15 carbon atoms interrupted by one or more ether bonds or thioether bonds, and R2 and R3 may form a ring together;
• wherein the R4 represents a group represented by the formula (3):
• in the formula (3), R5′ represents a linear, branched, or cyclic alkyl group having 1 to 17 carbon atoms, a linear or branched halogenated alkyl group having 2 to 5 carbon atoms, a linear or branched alkyl group having 2 to 7 carbon atoms interrupted by one or more ether bonds or thioether bonds, a phenyl group that may be substituted, a phenylalkyl group having 7 to 11 carbon atoms that may be substituted, a phenoxyalkyl group having 7 to 10 carbon atoms that may be substituted, a heterocyclic group that may be substituted, or a condensed ring group that may be substituted, and the R7 represents a linear, branched, or cyclic alkyl group having 1 to 16 carbon atoms, a linear or branched halogenated alkyl group having 1 to 6 carbon atoms, a phenyl group that may be substituted, a phenylalkyl group having 7 to 10 carbon atoms that may be substituted, a phenylalkyl group having 7 to 9 carbon atoms that is interrupted by one or more ether bonds or thioether bonds and may be substituted, a condensed ring group that may be substituted, or a heterocyclic group that may be substituted;
• and
• m and n each represent 0 or 1, and when m represents 1, n represents 1.