A flame aerosol method has been employed to prepare spherical TiO 2 nano-particle photocatalysts with controlled anatase/rutile phase ratios without calcination at higher temperatures. This method was found to have important advantages since the main factors in achieving high photocatalytic activity such as the particle size, crystallinity and the anatase/rutile phase ratios could be easily controlled. In particular, the incorporation of small amounts of bimetals, such as Fe and Zn, were found to initiate the formation of well-crystalline, small and uniform spherical nano-size particles with a well-defined anatase/rutile phase ratio of around 60/40, similar to P-25 TiO 2 . This suppressed the recombination of the photoformed charge carriers leading to a significant increase in the photocatalytic reactivity of the TiO 2 nano-particles. The incorporation of very small amounts of mono-metals, such as Fe, Cr and Zn (around 1 at.%), within the TiO 2 nano-particles led to a slight increase in the photocatalytic activity of the TiO 2 nano-particle photocatalysts for the complete oxidation of 2-propanol dissolved in water into CO 2 and H 2 O as compared with the unincorporated pure TiO 2 . The incorporation of bimetals of Fe and Zn within TiO 2 (Fe/Zn-TiO 2 ) nanoparticles, on the other hand, led to a remarkable enhancement in the photocatalytic activity as compared with the unincorporated and mono-metal incorporated TiO 2 .

Synthesis of Methoxythiazolidine Fused Heterocycles. -Lewis acid mediated intramolecular cyclizations of heterocyclic mercaptoacetals (I), (III) or (V) give methoxythiazolidine fused heterocycles in good to excellent yields. -(LEE, K.-J.; JEONG, J. U.; CHOI, D. O.; KIM, S. H.; KIM, S.; PARK, H.; Bull. Korean Chem.

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The acylation of o‐hydroxyphenacyl azide (I) yields the acyloxy derivatives (III) which are subjected to an intramolecular aza‐Wittig reaction to give the desired oxazepines (IV) as the main products.

Syntheses and Antiviral Activities of 1,3-Dioxolanyl-, 1,3-Oxathiolanyl-and 1,3-Dithiolanylnucleosides with 2-Hydroxymethyl Substituents.-Only the 1,3-dioxolanyl derivative (VII) shows weak antiviral activity among a series of title compounds. The synthesis of (VII) starts with the key-step condensation of dinucleophile (I) with ketal (II). -(CHUN, M. W.; SHIN, D. H.; MOON, H. R.; LEE, J.; PARK, H.; JEONG, L. S.; Bioorg. Med.