| abstract |
A diarylethene compound having high water-solubility is provided, and the compound is a diarylethene compound of formula (I) nwherein, 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; nU 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 nAr is a group represented by formula (A1) or (A2); nwherein, nX is S, SO 2 , NR 3 (R 3 is a C1-C3 alkyl group) or O, nR is C1-C4 alkyl group, nR 1 and R 2 are independently a C1-C3 alkyl group, na is 0 or 1, b is an integer of 0-3, and n* represents a bond with U); nY is a hydrogen atom or a halogen atom; nm is an integer of 5-7. |