Arsenic sugar sulphates, structure

Cyclopentamethylene-t-butylhydroxyarsane bromide 77 has a related ionic structure (As—O 1.729 A) with the six-membered ring in a chair conformation and hydroxy and butyl groups in axial and equatorial positions, respectively . It is curious that hydrolysis of cyclopentamethylenearsenic chloride yields the corresponding dihydroxide, [(CH2)5As(OH)2]C1, with As—O distances of 1.708 and 1.735 A, rather than the, perhaps expected, arsinic acid, (CH2)5As(0)(0H) °. From the As—O separation (1.733 A), it appears likely that an As—OH group is also present in the arsenic sugar sulphate 78, obtained from clam kidneys a related species has also been obtained from algae. ... 

JS Edmonds, KA Erancesconi, PC Healy, AH White. Isolation and crystal structure of an arsenic-containing sugar sulphate from the kidney of the giant clam Tridacna maxima X-ray crystal structure of (2S)-3-[5-deoxy-5-(dimethylarsinoyl)-B-D-ribofuranosyloxy]-2-hydroxypropyl hydrogen sulphate. J Chem Soc Perkin Trans 1 2989-2993, 1982. 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

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