(Hexaphenyltrimethylene)methane Dication and Related Carbocations
作者:Nicholas J. Head、George A. Olah、G. K. Surya Prakash
DOI:10.1021/ja00150a017
日期:1995.11
By ionization of the respective alkenediol (8a), the (hexaphenyltrimethylene)methane dication (2) has been prepared and found stable in solution under superacidic stable ion conditions (FSO3H/SO2ClF) up to at least -20 degrees C. The spectroscopic data and AM1 theoretical modeling indicate that although the entire pi-system is twisted, phenyl groups stabilize the positive charges in 2 to a similar degree as those in the trityl cation. The hexa-p-CF3 derivative of 2 was also observable but only at very low temperatures (-90 degrees C). Disruption of the 3-fold symmetry and reduction of the number of stabilizing phenyl rings even to five resulted in intramolecular allylation and subsequent formation of the corresponding indenyl cations. In all the cases studied no evidence for ''Y-aromatic'' stabilization was found.
SCHOETZ, K.;CLARK, T.;SCHALLER, H.;SCHLEYER, VON, R. P., J. ORG. CHEM., 1984, 49, N 4, 733-735
作者:SCHOETZ, K.、CLARK, T.、SCHALLER, H.、SCHLEYER, VON, R. P.
DOI:——
日期:——
Tribenzotriquinacene: A Versatile Synthesis and<i>C</i><sub>3</sub>-Chiral Platforms
作者:Georgios Markopoulos、Lars Henneicke、Jun Shen、Yoshio Okamoto、Peter G. Jones、Henning Hopf
DOI:10.1002/anie.201207220
日期:2012.12.14
Fusing rings: A new synthesis of the bowl‐shaped hydrocarbon tribenzotriquinacene is presented (see scheme). The synthesis allows easy access to ortho‐functionalized and C3‐chiral derivatives that are attractive for supramolecular chemistry and asymmetric catalysis.
The Regiospecific Preparation of 2-Substituted Tribenzotriquinacenes
作者:Henning Hopf、Rajendran Saravanakumar、Georgios Markopoulos、Lucian Bahrin、Peter Jones
DOI:10.1055/s-0032-1318143
日期:——
Several substituted tribenzotriquinacene derivatives (TBTQ) carrying functional groups exclusively in the 2-position (OMe, OH, Br, CHO, CN, styryl, etc.) have been prepared by our new synthesis of the tribenzotriquinacene framework. The route has been extended to the preparation of a double-cup molecule in which two TBTQ moieties are fused by a benzene ring. The trans configuration of one of the diastereomers
通过我们新合成的三苯并三喹并苯骨架,已经制备了几种仅在 2 位带有官能团(OMe、OH、Br、CHO、CN、苯乙烯基等)的取代的三苯并三喹并苯衍生物(TBTQ)。该路线已扩展到制备双杯分子,其中两个 TBTQ 部分通过苯环稠合。该烃的一种非对映异构体的反式构型是通过 X 射线结构分析确定的。