Abstract
When kept at 105° for 2.5 h, weakly alkaline, syrupy d-erythrose was readily converted into a mixture containing mainly d- glycero-tetrulose, the previously unknown β- d- altro- l- glycero-3-octulofuranose (2), and α- d- gluco- l- glycero-3-octulopyranose, which were isolated as the corresponding acetates. Treatment of 2 with Dowex 50 (H +) resin yielded 3,8-anhydro-β- d- altro- l- glycero-octulopyranose, identified as its acetate. Previous discrepancies in the [α] d values for d-erythrose appear partly to originate in the self-aldol reaction. The dimerisation of d-erythrose 4-phosphate is also described.
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