Vinylbenzylated phenol compound, method of manufacturing vinylbenzylated phenol compound, activated ester resin, method of manufacturing activated ester resin, thermoset resin composition, hardened material of thermoset resin composition, interlayer insulating material, prepreg, and method of manufacturing prepreg

A composition comprising a plurality of compounds represented by Formula (1) below,

• wherein, in the Formula (1),
• R1 to R5 are each independently hydrogen or a methyl group;
• p represents an average number of vinylbenzene substituents per compound in the composition and ranges from 0.1 to 4;
• and
• Ar0 is a structure represented by Formula (2), Formula (3), or Formula (11) below:
• where Y in the Formula (3) is a direct bond, —CH2—, —C(CH3)2—, —CH(CH3)—, an ether bond, a fluorenyl group, a sulfone group, a cyclohexylidene group, a 3,3,5-trimethylcyclohexylidene group, —C(CF3)2—, —C(CH3)(Ph)-, a structure represented by Formula (21) below, a structure represented by Formula (22) below, or a structure represented by Formula (23) below:
• where R26 to R33 are each independently hydrogen or a methyl group, and
• where Z in the Formula (11) is a direct bond, —CH2—, —C(CH3)2—, —CH(CH3)—, —CH(Ph)-, —C(CH3)(Ph)-, a fluorenyl group, a cyclohexylidene group, a 3,3,5-trimethylcyclohexylidene group, a structure represented by the Formula (21) above, a structure represented by the Formula (22) above, or a structure represented by the Formula (23) above.

An active ester resin comprising a component represented by Formula (6) below,

• where, in the Formula (6),
• Ar1 and Ar2 are each independently a phenyl group, a phenyl group having from one to three alkyl groups each having from one to four carbon atoms on an aromatic nucleus, a naphthyl group, or a naphthyl group having from one to three alkyl groups each having from one to four carbon atoms on an aromatic nucleus;
• n represents an average number of repeat units per molecule in the component and ranges from 0.5 to 30;
• and
• X is a structure represented by Formula (7), Formula (8), or Formula (13) below:
• where, in the Formula (7), R1 to R5 are each independently hydrogen or a methyl group, and m represents an average number of vinylbenzene substituents per X structure in the component and ranges from 0.1 to 4,
• where, in the formula (8), R6 to R15 are each independently hydrogen or a methyl group, Y is a direct bond, —CH2—, —C(CH3)2—, —CH(CH3)—, an ether bond, a fluorenyl group, a sulfone group, a cyclohexylidene group, a 3,3,5-trimethylcyclohexylidene group, —C(CF3)2—, —C(CH3)(Ph)-, a structure represented by Formula (21) below, a structure represented by Formula (22) below, or a structure represented by Formula (23) below, and l and k together represent an average number of vinylbenzene substituents per X structure in the component and each range from 0.1 to 2:
• where R26 to R33 are each independently hydrogen or a methyl group, and
• where, in the Formula (13), R16 to R25 are each independently hydrogen or a methyl group, Z is a direct bond, —CH2—, —C(CH3)2—, —CH(CH3)—, —CH(Ph)-, —C(CH3)(Ph)-, a fluorenyl group, a cyclohexylidene group, a 3,3,5-trimethylcyclohexylidene group, a structure represented by the Formula (21) above, a structure represented by the Formula (22) above, or the structure represented by Formula (23) above, and j and i together represent an average number of vinylbenzene substituents per X structure in the component and each range from 0.1 to 2.