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In Tetrahedron Letters 1970, 4579-82, J. H. Wieringa, J. Strating and H. Wynberg describe a process in which adamantylidene adamantane is reacted with chlorine is tetrachloromethane at a temperature of -20° to +10° C. to form 4-eq.-chloroadamantylidene adamantane in addition to polychlorinated products. The chloro-substituted adamantane compound is the starting point for further reaction in the presence of AgNO3 and THF/H2O to form a mixture of the corresponding 4-hydroxy-adamantylidene adamantane compounds, which with the appropriate oxidant (Jones reagent: CrO3, H2SO4, acetone) are finally converted into the corresponding ketone compound, in which the carbonyl group is in the 4-position.

1. customat a temperature of -20° to +10° C.