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A Thiyl Radical Mediated Cascade Sequence for the Co-Cyclization of 1,6-Hexadienes with Sulfur Atom Transfer.-The reaction with concomitant sulfur transfer involves a cascade reaction with addition of a thiyl radical to an alkene, cyclization through a chair-like transition state and termination by homolytic substitution at sulfur. -(HARROWVEN, DAVID C.; HANNAM, JOANNE C.; LUCAS, MATTHEW C.; NEWMAN, NICOLA A.; HOWES, PETER D.; Tetrahedron Lett. 41 (2000) 48, 9345-9349; Dep. Chem., Univ. Southampton, Southampton SO17 1BJ, UK; EN)

A New Cascade Radical Reaction for the Synthesis of Biaryls and Triaryls from Benzyl Iodoaryl Ethers.-A new method for the synthesis of biaryls and triaryls through an intramolecular ipso-substitution reaction initiated by the addition of an aryl radical to benzyl ether is developed. The method is applied to a tandem variant [→(VI)] and to the synthesis of the natural product isoaucuparin (IX). -(HARROWVEN, DAVID C.; NUNN, MICHAEL I. T.; NEWMAN, NICOLA A.; FENWICK, DAVID R.; Tetrahedron Lett. 42 (2001) 5, 961-964; Dep. Chem., Univ. Southampton, Southampton SO17 1BJ, UK; EN)