(2S,4R)-Pentane-1,2,3,4,5-Pentol → aldehydo-D-Xylose

Participants

Reaction Steps

10 g (66.6 mmol) D-xylose and 10 g (65.7 mmol) xylit were mixed in 90 ml benzene and thereafter 23.3 g (138.7 mmol) ethylboroxin were added. After quantitative removal of the water/benzene-aceotrop vacuum distillation resulted in 16.4 g of III, BP 74° C./10-3Torr (yield 96%). 16.6 g residue contained the O-ethylborandiyl-derivative of the xylit. To isolate the pure D-xylose out of III 200 ml methanol were dropped to the vacuum distillate and the light volatile part currently distilled off. 9.2 g of colourless, solid D-xylose of a melting point at 142° C. were isolated (95.8% yield). The residue was mixed with 40 ml of a 1:1 mixture of ethylene-glycole/ethanol and the mixture distilled in high vacuum. The residue 10.2 g is raw xylit (yield 102%).

Provenance & Evidence