Precursors to the cyclo[n]carbons: from 3,4-dialkynyl-3-cyclobutene-1,2-diones and 3,4-dialkynyl-3-cyclobutene-1,2-diols to cyclobutenodehydroannulenes and higher oxides of carbon

A series of novel cyclobutenodehydro(n)annulenes (n = 18, 24, 30) have been prepared as precursors in an organic approach to the cyclocarbons C{sub 18}, C{sub 24}, and C{sub 30}. On the way to these macrocycles, synthetic entries to three new classes of enediynes have been developed. Bis(1-propynyl)...

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