1,4-Hydrogen radical transfer as a new and versatile tool for the synthesis of enantiomerically pure 1,2,3-triols

[reaction: see text]1,4-Hydrogen radical transfers can now be reliably envisaged in radical synthetic chemistry as demonstrated by the formation of the cyano derivative II from I. Due to related sequences involving this new translocation process, followed by a highly diastereoselective trapping of the resulting anomeric radical, access to intriguing enantiopure 1,2,3-triols such as III is available.

Application of matrix-assisted laser desorption/ionization time-of-flight mass spectrometry to the structure determination of medium and large macrocycles formed by palladium(0)-catalyzed allylation of arenesulfonamides, sulfamide, and cyanamide.

Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry allowed the direct determination of the extent of macrocyclic and linear oligomer formation in the palladium(0)-catalyzed allylation of highly acidic and non-nucleophilic arenesulfonamides, sulfamide, and cyanamide. Palladium-containing 15-membered-ring macrocyclic compounds gave unusual [M - H](+) ions besides [M + Na](+) and [M + K](+) adducts. Copyright 1999 John Wiley & Sons, Ltd.