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Title: | Synthesis of Three New Donor- Acceptor [4] Dendralenes |
Authors: | MIR MUNSIF ALI TALPUR TAJNEES PIRZADA PETER SKABARA THOMAS WESTGATE MOHAMMAD RAZA SHAH |
Keywords: | dendralene Wittig reaction cross- conjugation UV-Vis Knoevehagel condensation |
Issue Date: | 6-Aug-2013 |
Publisher: | HEJ Research Institute of Chemistry, University of Karachi, Karachi. |
Citation: | Talpur, M. M., Pirzada, T., & Skabara, P. (2013). Synthesis of three new donor-acceptor (4) dendralenes. Journal of the Chemical Society of Pakistan, 35(4), 1219-1227. |
Abstract: | Three new donor - acceptor [4] dendralene compounds have been synthesized. Wittig reaction was used for the preparation of first two compounds and third one by Knoevehagel condensation. Their mass was calculated by APCI mass spectra which are in good agreement with theoretical data. UV-Vis data indicate the cross- conjugation in these systems due to the push-pull intra molecular charge transfer (CIT) sequence from electron donor to acceptor group. The ¹H-NMR signals appear in aromatic region confirming the formation of trans (having π- structures) isomers rather than cis may be due to the exposure of the compounds to ambient light. The dominating roll of electron acceptor nitro, methoxy and cyno benzene groups in conjugation is clearly shown. The ¹³C-NMR spectra which also supported the above analytical data and the number of carbons atoms obtained representing well the structures established. |
URI: | http://142.54.178.187:9060/xmlui/handle/123456789/19969 |
ISSN: | 0253-5106 |
Appears in Collections: | Issue 04 |
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