Phenylosazones of D-gluco-, D-manno- and D-galacto-heptulose gave crystalline 1-N-acetyl- as well as penta-O-acetyl derivatives. Boiling with acetic anhydride converted them into monoanhydro-osazones of the Diels type and into dianhydro-derivatives. The former were also obtained by treatment with methanolic sulphuric acid. Deacetylation of the penta-O-acetyl derivatives afforded dianhydro-osazones of the Percival type.
H. E. Khadem, M. M. A. A. Rahman and M. A. E. Sallam, J. Chem. Soc. C, 1968, 2411 DOI: 10.1039/J39680002411
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