Isolation of bicyclopropenylidenes: derivatives of the smallest member of the fulvalene family.

[摘要]：A triafulvalene deriv. is indefinitely stable at room temp. both in soln. and in the solid state under inert atm. The triafulvalene is synthesized by the magnesium-catalyzed coupling of two bis(chlorocyclopropenyl) derivs. The two unsatd. three-membered rings are linked together by a carbon-carbon double bond (1.303 ?, which is so reactive that spontaneous addn. of water occurs at room temp.

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