Since both d-glucose and d-gulose yield the same active (d) saccharic acid on oxidation, the configuration of this and the corresponding /-acid must be sought from among those numbered 5-10 in the above table.
7 and 8 can be at once ruled out, however, as acids so constituted would be optically inactive and the saccharic acids are active.
5, therefore, represents the configuration of one of the saccharic acids, and No.
The best instruments are now constructed for revenue purposes of silver, heavily gilded, because it was found that saccharic acid contained in some spirits attacked brass behind the gilding.
Moderately strong nitric acid changes it into mucic, saccharic, tartaric and oxalic acids.
It may also be obtained (together with racemic acid) by oxidizing milk sugar, saccharic acid, &c., with nitric acid, and by the reduction of oxalic ester with sodium amalgam (H.
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