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http://hdl.handle.net/2289/4660| Title: | Synthesis of triphenylene and dibenzopyrene derivatives: vanadium oxytrichloride a novel reagent |
| Authors: | Kumar, Sandeep Varshney, S.K. |
| Keywords: | triphenylene dibenzopyrene vanadium oxytrichloride oxidative coupling discotic liquid crystals |
| Issue Date: | 2001 |
| Publisher: | Thieme Publishing |
| Citation: | Synthesis, 2001, p305-311 |
| Abstract: | This paper presents an efficient synthetic procedure for the preparation of various triphenylene and dibenzopyrene derivatives using VOCl3 as a novel reagent. Symmetrically substituted hexaalkoxytriphenylenes are obtained from o-dialkoxybenzenes by oxidative trimerization with VOCl3 in high yields. The oxidative coupling of a 3,3’,4,4’-tetraalkoxybiphenyl and 1,2-dialkoxybenzenes or 1,2,3-trialkoxybenzenes affords unsymmetrically substituted derivatives of triphenylene. The reagent oxidizes 3,3’,4,4’- tetraalkoxybiphenyl efficiently to 2,5,6,9,12,13-hexaalkoxydibenzo[ fg,op]naphthacene-1,8-quinone and its 1,10-quinone isomer. Both the quinones can be converted to liquid crystalline derivatives using well-established chemistry. Effects of solvent, reagent concentration, acid catalyst and temperature have been studied. |
| Description: | Restricted Access. |
| URI: | http://hdl.handle.net/2289/4660 |
| ISSN: | 0039-7881 1437-210X (Online) |
| Copyright: | 2001 Thieme Publishing |
| Appears in Collections: | Research Papers (SCM) |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2001_Synthesis_p305-311.pdf Restricted Access | Restricted Access | 147.5 kB | Adobe PDF | View/Open Request a copy |
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