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The effects of π-acceptor and π-donor substitution in cross-conjugated enynes

✍ Scribed by Yuming Zhao; Sorin C Ciulei; Rik R Tykwinski

Publisher: Elsevier Science
Year: 2001
Tongue: French
Weight: 103 KB
Volume: 42
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(01)01659-8

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✦ Synopsis

Donor (p-NMe 2 C 6 H 4 ) and acceptor (p-NO 2 C 6 H 4 ) substitution has been appended onto two different cross-conjugated enyne scaffolds and the electronic effects as a function of substitution have been evaluated. Interestingly, the observed electronic effects are quite dependent on the constitution of the enyne framework. In the case of tetraynes 2a-c, acceptor substituted 2b shows an additional low energy absorption in the UV-vis spectrum as compared to 2a and 2c. In contrast, little difference in the electronic characteristics of 4a-b is detected. The X-ray crystallographic analysis of 4a is also described.

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