isomers. Here, we give an account of an efficient protocol to achieve this, which allows the synthesis of a broad variety of 4,15-disubstituted [2.2]paracyclophanes. Furthermore, we were able to resolve several of the racemic compounds via chiral HPLC and assign the absoluteconfigurations of the isolated enantiomers by X-ray diffraction and/or by the comparison of calculated and measured CD-spectra.
4,15-Diamino[2.2]paracyclophane as a Starting Material for Pseudo-Geminally Substituted [2.2]Paracyclophanes
作者:Kamal El Shaieb、Vijay Narayanan、Henning Hopf、Ina Dix、Axel Fischer、Peter G. Jones、Ludger Ernst、Kerstin Ibrom
DOI:10.1002/ejoc.200390095
日期:2003.2
with a bridge consisting only of heteroatoms. Reduction of 4 with zinc/acetic acid affords the substrate 3 again. Treatment of 4 with bromine/iron powder or iodine monochloride causes deazotization accompanied by halogen introduction in pseudo-geminal position (i.e., formation of 2 and 6, respectively). Flashvacuumpyrolysis (450 °C, 0.01 Torr) of 4 produces the phenanthrene derivatives 13 and 14, while
[2.2]Paracyclophane-Bis(triazole) Systems: Synthesis and Photochemical Behavior
作者:Lucian G. Bahrin、Laura G. Sarbu、Peter G. Jones、Lucian M. Birsa、Henning Hopf
DOI:10.1002/chem.201701593
日期:2017.9.7
the resulting triazoles was investigated under photochemical conditions. A variety of newly substituted [2.2]paracyclophanes were identified; deazotization of pseudo‐gem and pseudo‐para adducts provided indolophane derivatives. An intramolecular stabilization effect was observed in the case of pseudo‐gem derivatives. A photochemicalrearrangementfrom a pseudo‐para adduct to a pseudo‐ortho product