| abstract |
A diarylethene compound having high water-solubility is provided, and the compound is a diarylethene compound of formula (I) n n n n n n n n n n wherein, Sg is a monovalent sugar-type residue consisting of a sugar-type compound (in which some of hydroxyl groups may be protected) selected from a group consisting of a six-membered ring sugar, a five-membered ring sugar, cyclitol and oligosaccharides containing a six-membered ring sugar, a five-membered ring sugar, or cyclitol and excluding an hydroxyl group;n U is —(CH 2 )n-, —CH 2 —U′—, or —C(═O)— (wherein, n is an integer of 1 to 5, U′ is a C1-C10 alkyl group binding to Ar); and Ar is a group represented by formula (A1) or (A2); nn n n n n n n n n n wherein,n X is S, SO 2 , NR 3 (R 3 is a C1-C3 alkyl group) or O, R is C1-C4 alkyl group, R 1 and R 2 are independently a C1-C3 alkyl group, a is 0 or 1, b is an integer of 0-3, and * represents a bond with U); Y is a hydrogen atom or a halogen atom; m is an integer of 5-7. |