biostudies-literatureUnknown64(Pt 5)Tsai YFThe title compound, C(13)H(24)O(7), is the product of the ketalization of methyl l-(+)-rhamnopyran-oside with 2,3-butane-dione. It crystallizes with two mol-ecules in the asymmetric unit, which are connected by O-H⋯O hydrogen bonds. The C-3,4 diequatorial hydroxy groups of the methyl l-(+)-rhamnopyran-oside were protected, leaving the C-2 hydroxy group free. The l-(+)-rhamnopyran-oside and 2',3'-dimethoxy-butane-2',3'-diyl rings adopt chair conformations and all meth-oxy groups are in axial positions. The absolute configuration was assumed from the synthesis.Acta crystallographica. Section E, Structure reports onlineo897https://www.ebi.ac.uk/biostudies/studies/S-EPMC2961327biostudies-literatureMethyl (2'S,3'S)-3,4-O-(2',3'-dimethoxy-butane-2',3'-di-yl)-α-l-rhamnopyran-oside: a glycosyl acceptor.PMC2961327Yang JTChen JDTsai YFLin CHfalseMethyl (2'S,3'S)-3,4-O-(2',3'-dimethoxy-butane-2',3'-di-yl)-α-l-rhamnopyran-oside: a glycosyl acceptor.The title compound, C(13)H(24)O(7), is the product of the ketalization of methyl l-(+)-rhamnopyran-oside with 2,3-butane-dione. It crystallizes with two mol-ecules in the asymmetric unit, which are connected by O-H⋯O hydrogen bonds. The C-3,4 diequatorial hydroxy groups of the methyl l-(+)-rhamnopyran-oside were protected, leaving the C-2 hydroxy group free. The l-(+)-rhamnopyran-oside and 2',3'-dimethoxy-butane-2',3'-diyl rings adopt chair conformations and all meth-oxy groups are in axial positions. The absolute configuration was assumed from the synthesis.2008-01-01T00:00:00Z2008 Apr2025-06-01T00:07:28.679Z2025-06-01T00:07:28.679ZS-EPMC29613272120238010.1107/S1600536808008222