Aromatic polythiol compound for optical material

A process for preparing a compound represented by Formula 2 below, which comprises:

• (1) reacting a compound represented by Formula 4 below with epichlorohydrin to prepare a compound represented by Formula 5 below;
• (2) reacting the compound of Formula 5 with 2-mercaptoethanol to prepare a compound represented by Formula 6 below;
• and
• (3) reacting the compound of Formula 6 with thiourea and hydrolyzing the reaction product:
• In these formulae, R1 is each independently a sulfur atom, an oxygen atom, O═S═O, CX1Y1, or C═CX2Y2, wherein X1, Y1, X2, and Y2 are each independently a hydrogen atom, a halogen atom, C1-6 alkyl, C6-10 aryl, C3-6 cycloalkyl, or C1-6 alkoxy, and wherein X1 and Y1, and X2 and Y2, may combine with each other to form a C3-10 ring and may be substituted with at least one selected from the group consisting of a halogen atom, C1-6 alkyl, and hydroxy,
• R2 is each independently an oxygen atom or a sulfur atom,
• R2′ is each independently hydroxy or thiol, and
• R3 is each independently a hydrogen atom, a halogen atom, C1-10 alkyl, or C6-10 aryl.

A process for preparing a compound represented by Formula 3 below, which comprises:

• (1′) reacting a compound represented by Formula 7 below with epichlorohydrin to prepare a compound represented by Formula 8 below;
• (2′) reacting the compound of Formula 8 with 2-mercaptoethanol to prepare a compound represented by Formula 9 below;
• and
• (3′) reacting the compound of Formula 9 with thiourea and hydrolyzing the reaction product:
• In these formulae, R1 and R1′ are each independently a sulfur atom, an oxygen atom, O═S═O, CX1Y1, or C═CX2Y2, wherein X1, Y1, X2, and Y2 are each independently a hydrogen atom, a halogen atom, C1-6 alkyl, C6-10 aryl, C3-6 cycloalkyl, or C1-6 alkoxy, and wherein X1 and Y1, and X2 and Y2, may combine with each other to form a C3-10 ring and may be substituted with at least one selected from the group consisting of a halogen atom, C1-6 alkyl, and hydroxy,
• R2 is each independently an oxygen atom or a sulfur atom,
• R2′ is each independently hydroxy or thiol, and
• R3 is each independently a hydrogen atom, a halogen atom, C1-10 alkyl, or C6-10 aryl.

A process for preparing a compound represented by Formula 10 below, which comprises:

• (1) reacting a compound represented by Formula 11 below with 2-mercaptoethanol to prepare a compound represented by Formula 12 below;
• (2) reacting the compound of Formula 12 with a metal sulfide to prepare a compound represented by Formula 13 below;
• and
• (3) reacting the compound of Formula 13 with thiourea and hydrolyzing the reaction product:
• In these formulae,
• X is a halogen atom.

A process for preparing a compound represented by Formula 14 below, which comprises:

• (1) reacting a compound represented by Formula 17 below with epichlorohydrin to prepare a compound represented by Formula 18 below;
• (2) reacting the compound of Formula 18 with 2-mercaptoethanol to prepare a compound represented by Formula 19 below;
• and
• (3) reacting the compound of Formula 19 with thiourea and hydrolyzing the reaction product:
• In these formulae,
• R1 is each independently a sulfur atom or an oxygen atom,
• R1′ is each independently hydroxy or thiol, and
• R2 is each independently a hydrogen atom, a halogen atom, C1-10 alkyl, or C6-10 aryl.

A process for preparing a compound represented by Formula 15 below, which comprises:

• (1′) reacting a compound represented by Formula 20 below with epichlorohydrin to prepare a compound represented by Formula 21 below;
• (2′) reacting the compound of Formula 21 with 2-mercaptoethanol to prepare a compound represented by Formula 22 below;
• and
• (3′) reacting the compound of Formula 22 with thiourea and hydrolyzing the reaction product:
• In these formulae,
• R1 is each independently a sulfur atom or an oxygen atom,
• R1′ is each independently hydroxy or thiol, and
• R2 is each independently a hydrogen atom, a halogen atom, C1-10 alkyl, or C6-10 aryl.

A process for preparing a compound represented by Formula 16 below, which comprises:

• (1″) reacting a compound represented by Formula 23 below with epichlorohydrin to prepare a compound represented by Formula 24 below;
• (2″) reacting the compound of Formula 24 with 2-mercaptoethanol to prepare a compound represented by Formula 25 below;
• and
• (3″) reacting the compound of Formula 25 with thiourea and hydrolyzing the reaction product:
• In these formulae,
• R1 is each independently a sulfur atom or an oxygen atom,
• R1′ is each independently hydroxy or thiol, and
• R2 is each independently a hydrogen atom, a halogen atom, C1-10 alkyl, or C6-10 aryl.