Reference of 499-40-1, An article , which mentions 499-40-1, molecular formula is C12H22O11. The compound – (2R,3S,4R,5R)-2,3,4,5-Tetrahydroxy-6-(((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexanal played an important role in people’s production and life.
The reaction between trans-[RuCl2(dmso-S)4] (dmso = dimethyl sulfoxide) and di-2-pyridylamine (Hdpa) in EtOH-H2O at ca. 273 K afforded trans(Cl),cis(S)-[RuCl2(Hdpa)(dmso-S)2] (1) in moderate to high yield. When dissolved in DMSO, 1 rearranged to the more thermodynarnically stable cis(Cl),cis(S)-[RuCl2(Hdpa)(dmso-S) 2] (2), along with cis(Cl),trans(X)-[RuCl2(Hdpa)(dmso) 2] (X = S- or O-bonded dmso). The reaction of 2 with Ag(OTf) afforded cis(Cl,S),trans.(O,S)-[RuCl(Hdpa)(dmso-O)(dmso-S)2](OTf) (3-(OTf)) (OTf- = trifluoromethanesulfonate). X-ray crystal structures of 1, 2, and 3-(OTf) revealed that the conformation of the six-membered chelate ring formed by the Hdpa ligand with the Ru ion varies according to interactions among the co-ligands (dmso and Cl-) and the coun-ter-anion (OTf -). For 3 ¡¤ (OTf). the structural parameters, apart from the dmso-O ligand, were essentially comparable to those of 2, except for the axial Cl- ligand; the remaining axial site is occupied by the O-donor of the dmso ligand instead of the S-donor. The solution structures (in DMSO solution) of 1, 2, and 3-(OTf) are discussed on the basis of their 1HNMR spectra. In 3-(OTf), “flapping” of the Hdpa ligand causes the coordination modes (O- and S-bonded) of the two axial dmso ligands to undergo mutual alternation.
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Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics