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A chemo- and enantioselective [3 + 2] annulation of Morita-Baylis-Hillman carbonates of isatins with propargyl sulfones was catalyzed by a β-ICD O-MOM ether 1c, affording spirocyclic 2-oxindoles bearing an unusual cyclopentadiene motif in outstanding ee values (up to >99%). More electrophiles, such as N-phenylmaleimide, have been also utilized to deliver complex spirocyclic 2-oxindoles with good results.

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Nanoscopic CdS particles are decorated into the microchannel with nanometre-scale diameter of titanate nanotubes (TNTs) by using nonionic thioacetamide (TAA) as a sulfide precursor (labelled as CdS(TAA)/TNTs). The characterizations by XPS, TEM, XRD, Raman spectroscopy and UV-vis absorption confirm that CdS nanoparticles with smaller size and more homogeneous dispersion are obtained by using a TAA precursor in contrast to the particles predominantly formed on the surface of TNTs by adding ionic Na(2)S as a precursor (labelled as CdS(Na(2)S)/TNTs). As is expected, the photocatalytic activities of the nanosized CdS sensitized TNTs nanocrystal materials were superior to those of simple CdS and TNTs in the oxidation of rhodamine B under visible light irradiation. Furthermore, the comparison of photocatalysis activity between CdS(TAA)/TNTs and CdS(Na(2)S)/TNTs is also discussed.