Abstract
Controlled protonation of methane(tri-α-diazoacetone) ( 1) leads to open-chain tricarbonyl compounds 2, which can be cyclized by acids to 2,4,9-trioxaadamantanes 3. On the other hand, the base-induced cyclization of methane(tri-chloroacetone) ( 2, X Cl) leads to a triasterane derivative: 1-hydroxymethyltetracyclo-[3.3.1.0 4,6]nona-3, 7-dione ( 4).
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