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7-Acetamido-7-deoxy-L- galacto -heptulose was prepared by oxidation of l-acetamido-l-deoxy-D- glycero-D-galacto-heptitol with Acetobacter suboxydans . The new acetamido-deoxy-L-heptulose was shown to be a pyranose by comparison with β -D-fructopyranose. The following equations represent the optical rotation of 7-acetamido-7-deoxy- α -L- galacto -heptulopyranose in water at 20 °C and 3.5 °C, respectively:[  α  ]    20    D  =  -  15.5   e   -  .0396  t    -  97.1  ,[  α  ]    3.5    D  =  -  11.9   e   -  .0101  t    -  105.8    where t is the time in minutes after dissolution of the sample.

Synthesis and ring structure of 7-acetamido-7-deoxy-L-galacto-heptulose