Abstract

Abstract Ring expansion and cleavage of succinoin derivatives: spiro[4.5]decane‐1,4‐dione and ethyl 4‐cyclohexyl‐4‐oxobutanoate reactant: cyclohexanone diethyl ketal (6.88 g, 40 mmol) product: spiro[4.5]decane‐1,4‐dione product: Ethyl 4‐cyclohexyl‐4‐oxobutanoate (4) reactant: 1,2‐Bis(trimethylsiloxy)cyclobut‐1‐ene intermediate: 2‐(1‐ethoxycyclohexyl)‐2‐(trimethylsiloxy)cyclobutanone intermediate: silyl ether 3

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