Molecular Spur Gears Comprising Triptycene Rotators and Bibenzimidazole-Based Stators
作者:Derik K. Frantz、Anthony Linden、Kim K. Baldridge、Jay S. Siegel
DOI:10.1021/ja2063346
日期:2012.1.25
Dynamic gearing of molecular spur gears, the most common type of mechanical gear, is elucidated. Molecular design and conformational analysis show that derivatives of 4,4-bis(triptycen-9-ylethynyl)bibenzimidazole represent suitable constructs to investigate gearing behavior of collateral triptycene (Tp) groups. To test this design, DFT calculations (B97-D/Def2-TZVP) were employed and the results suggest that these molecules undergo geared rotation preferentially to gear slippage. Synthesis of derivatives was carried out, providing a series of molecular spur gears, including the first desymmetrized spur gear molecules, which were subsequently subjected to stereochemical analysis.
Deamination of 1-Alkyl-9-aminomethyltriptycenes: Participation of the α-C-H Bond of the 1-Alkyl Group
作者:Gaku Yamamoto、Hisashi Mochida
DOI:10.1246/cl.2000.454
日期:2000.5
Diazotization of 1-alkyl-9-aminomethyltriptycenes (alkyl = methyl and ethyl) in AcOH or CHCl3 gives products derived from participation of an α-C-H bond of the 1-alkyl group. The product distributions strongly depend on the 1-alkyl group and the solvent.