Calculations on [Ag(NHCHNH)] 2 and [Ag(dmtp)(NO 3 )] 2 complexes have been performed at RHF, DFT (B3LYP), and MP2 levels. Geometry optimizations have been performed on both compounds comparing the result obtained with the different levels of theory and basis set against the available experimental X-ray data. The existence of M‚‚‚M interaction at the different levels has been studied on both complexes using the Bader "Atoms in molecules" methodology.

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DOLORES PORTAL OLEA, and CRIST~NA ROMERO-AVILA. Can. J. Chem. 66, 2975 (1988).Penta-0-acetyl-D-glucose diethyl dithioacetal monoxide 3 was obtained by oxidation of penta-0-acetyl-D-glucose diethyl dithioacetal 2 with 3-chloroperbenzoic acid. By reaction of 3 with sodium methoxide in methanol and further acetylation, 3,4,6-tri-0-acetyl-2,5-anhydro-D-mannose-diethy dithioacetal monoxide 8 and the reduction product 3.4,6-tri-0-acetyl-2.5-anhydro-l,l-bis(ethyIthio)-l-deoxy-~-arabino-hex--enitol 4 were obtained. Reduction of 8 yielded the corresponding dithioacetal derivative 9, which was converted to 3,4,6-tri-0-acetyl-23-anhydro-D-mannose diethyl acetal 11. JUAN A. L~P E Z SASTRE, J O S~ MOLINA MOLINA, DOLORES PORTAL OLEA et CRISTINA ROMERO-AVILA. Can. J. Chem. 66, 2975 (1988).L'oxydation du ditthyl dithioacktal du penta-0-acCtyl-D-glucose 2 par I'acide chloro-3 perbenzo'ique conduit au monoxyde du ditthyl dithioacktal penta-0-acttyl-D-glucose 3. La rtaction du composk 3 avec le mkthanolate de sodium dans le mtthanol, suivie d'une acttylation, conduit au monoxyde du diCthyl dithioacktal tri-0-acttyl-3.4,6 dChydro-2,5 D-mannose 8 et au produit de rCduction, le tri-0-acCtyl-3,4,6 anhydro-2,5 bis-kthylthio-I, 1 deoxy-l D-arabino-hexkne I it01 4. La rkduction du composk 8 conduit au dkrivt dithioacttal correspondant 9 que I'on transforme en dikthyl acCtal tri-0-acttyl-3,4,6 anhydro-2,5 D-mannose.[Traduit par la revue]

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