An object of the present invention is to develop a protecting group, which can prevent solidification or insolubilization of a compound by protecting a functional group to achieve easy separation and purification after a reaction. A diphenylmethane compound represented by general formula (1): wherein Y represents -OR 19 (wherein R 19 represents a hydrogen atom or an active ester-type protecting group), - NHR 20 (wherein R 20 represents, for example, a hydrogen atom, a C 1-6 linear or branched alkyl group, or an aralkyl group, at least one of R 1 to R 10 represents a group represented by formula (2): €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ -O-R 11 -X-A €ƒ€ƒ€ƒ€ƒ€ƒ (2) and the others each independently represent a hydrogen atom, a halogen atom, a C 1-4 alkyl group, or a C 1-4 alkoxy group; R 11 represents a C 1-16 linear or branched alkylene group; X represents O or CONR 21 (wherein R 21 represents a hydrogen atom, or a C 1-4 alkyl group; and A represents, for example, a group represented by formula (3).
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