9-Triptycylallene (1) was synthesized by LiAlH 4 reduction of l-(9-triptycyl)-2-propynyl methanesulfonate (7), and three 3-substituted derivatives of 1 were also obtained by reacting compound 7 with appropriate metal reagents. LiAlH 4 reduction of 1,3-di(9-triptycyl)-2-propynyl methanesulfonate (10) gave 1,3-di(9-triptycyl)propyne (12). The molecular structures of some of the allenes and of the propyne were