Ribose specific rotation

The discrepancy between the specific rotation for di-D-ribose anhydride reported by Bredereck, Kdthnig and Berger (reference 26) and that found by Barker and Lock (reference 71) has been corrected by R. W. Jeanloz, G. R. Barker and M. V. Lock [Nature, 167, 42 (1951)] who have pointed out an arithmetical error in the paper of reference 26. 

Synthetic 2-desoxy-L-ribose (-L-arabinose), prepared by the action of dilute sulfuric acid on L-arabinal (L-ribal), had the same numerical values of initial and equilibrium specific rotation (but opposite sign) as had the sugar of thymus nucleic acid. Hence the sugar was identified as 2-desoxy-D-ribose. On treatment with dilute sul-... 

D-Ribulose 5-phosphate is found together with D-ribose 5-phosphate as an oxidation product of n-gluconic acid 6-phosphate with a purified yeast enzyme (221-223). The D-ribulose 5-phosphate was identified as the o-nitrophenylhydrazone derivative, having a specific rotation in methanol of 50 5°. D-Ribulose 5-phosphate appears to be the precursor of D-ribose in yeast and rat liver. A D-ribulose diphosphate was detected in the products formed during the first few seconds of photosynthesis (224) ... 

---