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Liquid Crystals Volume 34, 2007 - Issue 7
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Iodo‐substituted triphenylene‐based discogens: by metal‐mediated oxidative cross‐coupling

Sanjay K. Varshney Centre for Liquid Crystal Research, P.O. Box 1329, Jalahalli, Bangalore ‐ 560 013, IndiaCorrespondence[email protected]
,
C. V. Yelamaggad Centre for Liquid Crystal Research, P.O. Box 1329, Jalahalli, Bangalore ‐ 560 013, India
&
H. Takezoe Tokyo Institute of Technology, Department of Organic and Polymeric Materials, O‐okyama, Meguro‐ku, Tokyo 152‐8552, Japan
Pages 787-790 | Received 19 Dec 2006, Accepted 02 Feb 2007, Published online: 18 Jul 2007
 
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Abstract

New monoiodopentakis(alkoxy)triphenylene derivatives were synthesized and characterized. The metal‐mediated oxidative coupling of 2‐iodoalkoxybenzene with 3,3′,4,4′‐tetraalkoxybiphenyl by MoCl5 as oxidizing reagent yields 2‐iodopentakis(alkoxy)triphenylene. These products were purified by repeated column chromatography; their liquid crystalline properties were studied by polarizing optical microscopy and differential scanning calorimetry. All the derivatives exhibit a columnar mesophase over a wide temperature range.

Acknowledgement

SKV is very grateful to Dr S. K. Prasad for many helpful discussion and keen support.

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