The cyclic glucose derivative 6-phosphogluconolactone is an intermediate in the pentose phosphate pathway. 6-Phosphogluconolactone ?-D-Glucose Compare the oxidation state of carbon-1 (C-1) for the cyclized forms of 6-phosphogluconolactone and ?-D-glucose. In 6-phosphogluconolactone, C-1 is a hydroxyl group; in ?-D-glucose, C-1 is a carboxyl group. In 6-phosphogluconolactone, C-1 is an aldehyde; in ?-D-glucose, C-1 is a hydroxyl group. In 6-phosphogluconolactone, C-1 is a carboxylic acid ester; in ?-D-glucose, C-1 is a hemiacetal. In 6-phosphogluconolactone, C-1 is a ketone; in ?-D-glucose, C-1 is a thiol.
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In its cyclic form, β-D-glucose is a hemiacetal because the carbon-1 (C-1) is connected to an oxygen in a ring and also has a hydroxyl group (-OH) attached to it. This is characteristic of hemiacetals. Show more…
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