The oriented ingots of isostructural compounds Sn,SbSZ13 and Pb,SbS,13 were prepared using a modified Bridgman method. The lattice parameters of the prepared orthorhombic compounds have been determined by a X-ray powder diffraction analysis. From the spectral response of the photoconductivity the following values for the forbidden zone of the prepared sulfides-iodides were found: E,(Sn,SbS,13) 1.5 eV, E,(Pb,SbS,I,) = 2.0 eV.

No abstract

We have prepared a full series of 1,6-anhydro-2,3,4-trideoxy-4-fluoro-2,3-epimino-beta-d-hexopyranoses. The key step was the reaction of azido sulfonates possessing a free C-4 hydroxyl with DAST and subsequent LiAlH(4) reduction. Nucleophilic displacement of the hydroxyl activated by DAST proceeded without rearrangement and with moderate to good yields. A convenient synthesis of d-mannoepimine from a readily available 3-benzylamino derivative was also developed.

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The selective deprotection of N-benzyl group was achieved in the presence of azido, O-benzyl, and N-tosyl groups in reactions of benzylamines derived from 1,6-anhydro-b-D-glucopyranose with diisopropyl azodicarboxylate (DIAD) in THF. The key role of this solvent and the reaction pathway are presented together with proven reaction intermediates.