A rhodium-catalysed direct formylmethylation adopting vinylene carbonate as an ethynol equivalent is reported. The developed catalytic system is further utilised for the oxidant-free production of esters with the liberation of...

A benzo [b]thiophene synthesis by Rhcatalyzed three-component coupling reaction of arylboronic acids, alkynes, and elemental sulfur (S 8 ) is developed. A notable feature of this protocol is that the thienannulation (thiophene annulation) proceeds with high regioselectivity via the sequential alkyne insertion, CÀ H activation, and then sulfur atom transfer to the metallacycle intermediate. In a similar manner, dibenzothiophenes can be synthesized from the parent biarylboronic acids and S 8 .

Oxidation of β,γ-Unsaturated Ketones with Molecular Oxygen Catalyzed by Metal Phthalocyanines and Porphyrins: A Practical Synthesis of Oxophorone.-A simple method for the oxidation of β-isophorone (III) to oxophorone (IV), an important key intermediate for the synthesis of carotenoids, is presented. This method can also be applied to the oxidation of acyclic unsaturated ketones (V). Compound (VIa) is an aggression controlling substance in bees.-(ITO, N.; ETOH, T.; HAGIWARA, H.; KATO, M.; Synthesis (1997) 2, 153-155; Res. Dev.

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