Abstract
The reaction of dibenzofuran or dinaphthofuran with lithium in anhydrous diethyl ether led to a solution of the corresponding C,O-dilithiated intermediate which, upon treatment with 1,3,3-trimethylindolin-2-one or different coumarin derivatives at -78 °C, afforded, after hydrolysis, dibenzospiropyrans and dinaphthospiropyrans in good yields. The structures of all new compounds were determined by single crystal X-ray analysis.
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