Thea cyloxy group of 2-acyloxy-2H-azirines has been displaced by carboxylic acids to generate the corresponding 2-acyloxy-2H-azirines by using potassium iodide as ap romotor. This metalfree method can be performed with aw ide scope of substrates readily generating productsi nm oderate to high yields.I ta lso represents an example of nucleophilic substitution between estersa nd carboxylic acids under metal-free reactionc onditions for the first time.
A new approach to the direct synthesis of Fe−Si-bonded complexes (η 5 -C 5 H 4 R)Fe(CO) 2 SiR′ 3 (1) by the reaction of cyclopentadienes C 5 H 5 R (2) with pentacarbonyliron in the presence of hydrosilanes R′ 3 SiH (5) has been developed. Thus, when the reaction of 2 and pentacarbonyliron in refluxing p-xylene was performed in the presence of 5, the desired complexes were successfully obtained in good yields, providing a simple one-step synthetic route to obtain 1 from the readily available starting materials, wherein the substituents R and R′ could vary over a wide range: C
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