beta-Lactones have, for the first time, been prepared by 4-exo-trig radical cyclization. Thus, alpha-ethenoyloxy radicals react in the presence of tributylstannane in a photothermal process to give beta-lactones. Highest yields were obtained when groups capable of stabilizing a carbon-centered radical were present at the 3-position of the alkenoate acceptor.

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The preparation of ternary iron(I1) complexes [Fe(CN)2(LL)2] and [Fe(C.N)4(LL)]2-, where LL = a Schiff base derived from 2-acetyl pyridine and a long chain amine 1-Me(CH2),NH2 (n = 11, 15, 17), is described. These complexes exhibit strong solvatochromism and can thus be used to probe

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Oxetane derivativesOxetane derivatives R 0035The First Preparation of β-Lactones by Radical Cyclization. -β-Lactones are prepared for the first time by 4-exo-trig radical cyclization of α-ethenoyloxy radicals. These radicals react in the presence of tributylstannane in a photothermal process to give the desired lactones. Highest yields are obtained when groups capable of stabilizing a carbon-centered radical are present at the 3-position of the alkenoate acceptor.-(CASTLE, K.; HAU, C.-S.; SWEENEY*, J. B.; TINDALL, C.; Org. Lett. 5 (2003) 5, 757-759; Dep. Chem., Univ. Reading, Whiteknights, Reading, Berkshire RG6 6AD, UK; Eng.) -Klein 29-095