The hydrazones (I) react with the silane (II) to give the 6‐membered cyclic ylides (III) or the 5‐membered compounds (IV) depending on the configuration of (I).
ChemInform Abstract Silylation of the hydrazides (I) with trimethylsilyl chloride (II) takes place exclusively at the oxygen atom, producing the hydrazonic acid esters (III).
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