Fluorénacènes et fluorénaphènes Synthèses dans la série des indéno‐fluorènes, XVI. Méthyl‐5‐, diméthyl‐5, 6‐ et diphényl‐5, 6‐dihydro‐11, 12‐indéno [2.1‐a] fluorène

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Abstract
Starting from 2‐methyl‐ and from 2,3‐dimethyl‐1,4‐diphenyl‐butadiene‐1, 3 respectively, the 5‐methyl‐ and the 5,6‐dimethyl‐11, 12‐dihydro‐indeno[2.1‐a]fluorene are synthesized in 4 steps. The 5, 6‐diphenyl‐11, 12‐dihydro‐indeno[2.1‐a]fluorene is obtained by reduction of the already known 11, 12‐dioxoderivative. Accesorily a new preparation of the unsubstituted hydrocarbon is described.