Abstract
Activation of nitro compounds was accomplished by introduction of angle strain, γ,δ-unsaturation, or a γ-silyl group. Results from a systematic study indicate that coexistence of two or more of these factors in aliphatic nitro compounds allowed transformations to take place under ambient conditions upon catalysis with AlCl 3 , TiCl 4 , BF 3 · OEt 2 , or SnCl 4 . Consequently, structurally modified nitro starting materials led to products in the class of nitroalkyl cyclopentadiene, cyclohydroxamic ester, and chlorohydroxamic acid. (C) 2000 Elsevier Science Ltd.