Scheme 1. Synthesis of (A) Polycyclohexylene, (B) 1,2,3,4-Tetracyclohexylcyclohexane, (C) Hexacyclohexylbenzene (HCB), and 1,2,3,4,5,6-Hexacyclohexylcyclohexane (HCC) by Hydrogenation
Figure 1. (A) Mass spectra of reaction mixtures after 1, 2, and 4 days using APCI ion source. (B) HPLC analysis of reaction mixtures after 1 and 4 days eluted using a gradient from tetrahydrofuran/acetonitrile (5%/95%) to tetrahydrofuran (100%) over 20 min with a flow rate of 1 mL/min on a Gemini 5 μm C6-Phenyl column. The HPLC signal was taken from absorption at 220 nm.
Figure 2. Single-crystal structure of HCB: (A) top view, (B) side view. Only the methine protons are shown for clarity. (C) Molecular packing of HCB with highlighting CH/π interactions.
Figure 3. Single-crystal structures of HCC with (A) chair and (B) deformed conformations of the central cyclohexane. Only the methine protons are displayed for clarity. The methine protons in the central cyclohexane are highlighted in red for easy identification. Molecular configurations of (C) HCC-chair and (D) HCC-TB.
Figure 4. (A) HPLC analysis of HCB and HCC crystals eluted using a gradient from tetrahydrofuran/acetonitrile (5%/95%) to tetrahydrofuran (100%) over 20 min with a flow rate of 1 mL/min on a Gemini 5 μm C6-Phenyl column. (B) Normalized absorption spectra of HCB and HCC measured from the UV–vis detector during HPLC analysis.
From Hexaphenylbenzene to 1,2,3,4,5,6-Hexacyclohexylcyclohexane
Marcel Dillenburger, Zijie Qiu*, Cheng-Wei Ju, Beate Müller, Svenja Morsbach, Dieter Schollmeyer, Akimitsu Narita*, and Klaus Müllen*
DOI: 10.1021/jacs.0c04956
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