Transition Metal Carbonyls and Ultrasound

Abstract

π-Allyltricarbonyliron lactone complexes are useful precursors for organic synthesis. They were first reported in 1964 [254] and have since been shown to be available from a variety of substrates [255]. For example, they may be prepared from alkenyl epoxides or various butenediols [256] and their derivatives by treatment with tetracarbonyl iron [257]. Work in our laboratories had shown that these were useful precursors for a wide range of naturally occurring (β and δ-lactones and lactams [258] (Scheme 123).