WHAT IS CLAIMED IS:
1. A color developing composition comprising a compound represented by Formula 1,

wherein, in Formula 1, R represents a group in which an R -O bond is cleaved by heat or exposure to infrared rays, R2 and R' each independently represent a hydrogen atom or an alkyl group, R2 and RJ may be linked to each other to form a ring, Ar1 and Ar2 each independently represent a group forming a benzene ring or a naphthalene ring, Y and Y" each independently represent an oxygen atom, a sulfur atom, -NR0-, or a dialkyl methylene group, R and R5 each independently represent an alkyl group, R6 to R9 each independently represent a hydrogen atom or an alkyl group, R° represents a hydrogen atom, an alkyl group, or an aryl group, and Za represents a counter ion neutralizing a charge.
2. The color developing composition according to claim I,
wherein R is a group represented by any one of Formulae 1-1 to 1-7,
1

in Formulae 1-1 to 1-7, • represents a bonding site with the O atom in Formula 1, R 's each independently represent a hydrogen atom, an aJkyl group, an alkenyl group, an aryl group, -OR , -NR JR , or -SR , R 's each independently represent a hydrogen atom, an alkyl group, or an aryl group, R12 represents an aryl group, -OR14, -NR15R16, -SR!7, -C(=0)R1R, -OC(=0)R , or a halogen atom, R " represents an aryl group, an alkenyl group, an alkoxy group, or an onium group, R14 to R17 each independently represent a hydrogen atom, an alkyl group, or an aryl group, R18's each independently represent an alky! group, an aryl group, -OR14, -NR'^R16, or -SR17, and Z1 represents a counter ion neutralizing a charge.
3. The color developing composition according lo claim 2,
wherein R1 is a group represented by any one of Formulae l-l to 1-3.
4. The color developing composition according to any one of claims 1 to 3,
wherein R is a group represented by Formula 2,
10 Za'
R\ +
\^ R20
(2)
in Formula 2, • represents a bonding site with the O atom in Formula I. R and R" each independently represent an alkyl group, and Za' represents a counter ion neutralizing a charge.
5. The color developing composition according to any one of claims 1 to 4, further
comprising:
a binder polymer.

6. The color developing composition according to any one of claims 1 to 5, further
comprising:
a polymerization initiator; and a polymerizable compound.
7. The color developing composition according to any one of claims 1 to 6, further
comprising:
a chain transfer agent.
8. The color developing composition according to claim 7,
wherein the chain transfer agent is a thiol compound.
9. The color developing composition according to any one of claims 1 to 8, further
comprising:
a borate compound.
10. The color developing composition according to claim 9,
wherein a potential difference between a highest occupied molecular orbital of the compound represented by Formula 1 and a highest occupied molecular orbital of the borate compound is 0.585 eV or more.
11. The color developing composition according to claim 9 or 10.
wherein the borate compound is a tctraary I borate compound.
12. The color developing composition according to any one of claims 1 to 11 which is a thermosensitive and/or infrared-sensitive color developing composition.
13. A lithographic printing plate precursor comprising:
a layer including a compound represented by Formula 1 and a binder polymer on a support,

R1
O
. —. Y1 R6 R7 T R8 R9 Y2
i Ar1 f )> l=L-f^S-—I I—^ ^1 Ay2\ ( 1 )
-- N+ R2 R3 IjH-''
R4 Za R5
wherein, in Formula 1, R1 represents a group in which an R'-O bond is cleaved by heat or exposure to infrared rays, R2 and R3 each independently represent a hydrogen atom or an alkyl group, R2 and RJ may be linked to each other to form a ring. Ar1 and Ar2 each independently represent a group forming a benzene ring or a naphthalene ring, Y1 and Y2 each independently represent an oxygen atom, a sulfur atom, -NR -, or a dialkyl methylene group, R4 and R5 each independently represent an alkyl group, R6 to R9 each independently represent a hydrogen atom or an alkyl group, R° represents a hydrogen atom, an alkyl group, or an aryl group, and Za represents a counter ion neutralizing a charge.
14. The lithographic printing plate precursor according to claim 13,
wherein the layer is an image-recording layer.
15. The lithographic printing plate precursor according to claim 14, further comprising:
a protective layer on the image-recording layer.
16. The lithographic printing plate precursor according to claim 13,
wherein the layer is a protective layer.
1 7. A plate making method for a lithographic printing plate, comprising:
an exposure step of exposing the lithographic printing plate precursor according to
anyone of claims 13 to 16 in an image pattern; and
an on-machine development process step of removing non-image portions by
supplying printing ink and dampening water to the lithographic printing plate precursor that
has been exposed in an image pattern on a printer.
I 8. A compound represented by Formula 1,

R1
O
, —. Y1 R R? I R8 R9 Y2
R4 za R5
wherein, in Formula 1, R] represents a group in which an R'-O bond is cleaved by heat or exposure to infrared rays, R" and R each independently represent a hydrogen atom or an alky! group, R2 and R3 may be linked to each other to form a ring, Ar1 and Ar2 each independently represent a group forming a benzene ring or a naphthalene ring, Y and Y each independently represent an oxygen atom, a sulfur atom, -NR0-, or a dialkyl methylene group, R4 and R5 each independently represent an alky! group, R6 to R9 each independently represent a hydrogen atom or an alky] group, R represents a hydrogen atom, an alkyl group, or an aryl group, and Za represents a counter ion neutralizing a charge.
19. The compound according to claim 18,
wherein R is a group represented by any one of Formulae 1-1 to 1-7,
R11 R11
O \y R12 R11 R11 Ki R10
^R'O ^V .xRl3 -vR
K R11 R11 K R10
( 1 - 1 ) (1-2) (1-3) (1-4)
^S02R10 ^Si(R10)3 ^N^J
(1-5) (1-6) (1-7)
in Formulae I-I to I-7, • represents a bonding site with the O atom in Formula I, R 's each independently represent a hydrogen atom, an alkyl group, an aikenyl group, an aryl group, -OR . -NR ~R ', or -SR , R ],s each independently represent a hydrogen atom, an

aikyl group, or an aryl group, R12 represents an aryl group, -OK ', -NR'^R16, -SR17, -C(=0)R18, -OC(=0)R18, or a halogen atom, Rfj represents an aryl group, an aikenyl group, an alkoxy group, or an onium group, R14 to R17 each independently represent a hydrogen atom, an alkyl group, or an aryl group, R 's each independently represent an alkyl group, an aryl group, -OR14, -NRbR16, or -SR17, and Z1 represents a counter ion neutralizing a charge.
20. The compound according to claim 19,
wherein R1 is a group represented by any one of Formulae 1-1 to 1-3.
21. The compound according to any one of claims 1 8 to 20,
wherein R1 is a group represented by Formula 2,

in Formula 2, • represents a bonding site with the O atom in Formula 1, R19 and R20 each independently represent an alkyl group, and Za' represents a counter ion neutralizing a charge.
22. The compound according to any one of claims 18 to 21 which is a thermosensitive
and/or infrared-sensitive color developer.