J. Kerth et al., Reactions of (1-diazo-2-oxoalkyl)silanes with 3H-1,2,3,4-triazaphospholes:a route to short-lived 4-imino-1,2,4(lambda(5))-diazaphospholes, TETRAHEDRON, 56(1), 2000, pp. 35-42
(1-Diazo-2-oxoalkyl)silanes 1 react with a 3-phenyl-3H-1,2,3,4-triazaphosph
ole (3) to form dispiroannulated 1,3-diaza-2,4-diphosphetidines 4. With 3-a
lkoxycarbonyl-3H-1,2,3,4-triazaphospholes 5, 4-alkoxy-4-isocyanato-1,2,4(la
mbda(5))-diazaphospholes 6 are obtained. The structures of 4a and 6c were e
stablished by X-ray crystal structure analysis. It is proposed that 4-imino
-1,2,4(lambda(5))-diazaphospholes are the immediate precursors of both type
s of products. (C) 1999 Elsevier Science Ltd. All rights reserved.