Synthetic Route of 499-40-1. Chemistry is the experimental science by definition. We want to make observations to prove hypothesis. Like 499-40-1, Name is (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. In a document type is Article, introducing its new discovery.
The crystal structure of Cs2[Co2(nta)2(mu-OH)2] · 4H2O (nta = nitrilotriacetate) has been determined from three-dimensional X-ray diffraction data. Two hydroxo groups act as bridging groups between the two Co metal centres. The Co – OH bond distances are 1.899(5) and 1.897(5) A, respectively and the Co – OH – Co bond angles 98.2(2). The nta ligand acts as a tetradentate ligand and bonds with a nitrogen as well as three oxygen atoms to the Co metal centre. The Co – N and Co – O(av) bonds are 1.922(6) and 1.895(5) A, respectively. (C10H10H3)2[CoCl4] consists of discrete monoprotonated 2,2?-iminodipyridinium cations and CoCl2-4 anions. The anions assume a regular tetrahedral geometry, with the Cl – Co – Cl bond angles varying between 107.34(10) and 112.07(10). The Co – Cl bond distances are 2.270(2) and 2.282(2) A, respectively. The two pyridine rings in the cation assume an almost planar orientation with a deviation of 7.7(6) for the dihedral angle between the two ring systems. The planar orientation can be attributed to weak hydrogen bonding between the unprotonated nitrogen atom of the one pyridine ring and the proton bonded to the other nitrogen atom on the adjacent ring.
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Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics