A novel transition-metal-catalyzed rearrangement of silylated cyclopropenes to the corresponding allenes is described. The presence of both the trimethylsilyl group on the cyclopropene and the platinum catalyst are crucial for this rearrangement.

A mild, efficient and convenient method for the synthesis of α-silyl ketones from corresponding aldehydes and trimethylsilyldiazomethane in the presence of a catalytic amount of indium(III) chloride has been developed.

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Metal-Catalyzed Rearrangement of Cyclopropenes to Allenes. -The presence of both the Tms group on the cyclopropene ring and the platinum catalyst are crucial for the novel reaction. A variety of silylated cyclopropenes is converted to silylated allenes under mild conditions (15 examples). -(LI, J.; SUN, C.; DEMERZHAN, S.; LEE*, D.; J. Am. Chem. Soc. 133 (2011) 33, 12964-12967, http://dx.doi.org/10.1021/ja204979r ; Dep. Chem., Univ. Ill., Chicago, IL 60607, USA; Eng.) -Klein 04-159

Palladium-NHC Catalyzed Formation of Cyclopenta[b]benzofurans and Their Subsequent Modification. -The transformation of recently reported cyclopenta[b]benzofurans (I), (VIII), and (XII) having bis-esters substituted hydrazino side chains is developed to give products of type (VII), (XI), and (XIII) with potential biological activity. -(DEMERZHAN, S.; GILBERTSON*, S. R.; Tetrahedron Lett. 56 (2015) 23, 3633-3635, http://dx.