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Wednesday, August 26 • 11:00am - 11:40am
[0048] What are Heterocyclic Mesomeric Betaines?

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Our systematic analysis identifies five discrete classes and associated subclasses. Each general class and subclass has different structural properties and reactivity profiles. In particular, it is important to distinguish between Conjugated (Class 1), Cross-conjugated (Classes 2 & 4) and Semi-conjugated (Classes 3 and 5) mesomeric betaines. Representatives of some classes are well known, others are rare and examples of a few are unknown. Together they account for a large area of heterocyclic chemistry. The common features and significant differences of the betaines shown will be discussed and our recent studies of (i) the aromaticity of semi-conjugated mesomeric betaines and (ii) mesomeric betaine/N-heterocyclic carbene tautomerism will be described.  

Invited Lecturers
avatar for Christopher Ramsden

Christopher Ramsden

Emeritus Professor of Organic Chemistry, Keele University
I was born in Manchester, UK in 1946. I graduated from Sheffield University and received my PhD (W. D. Ollis) in 1970 and DSc in 1990. After post-doctoral work at the University of Texas (M. J. S. Dewar)(1971-3) and University of East Anglia (A. R. Katritzky)(1973-6), I worked in the pharmaceutical industry. I moved to Keele University as Professor of Organic Chemistry in 1992. My research interests are heterocycles and three-centre bonds and... Read More →


Wednesday August 26, 2015 11:00am - 11:40am
Corwin Pavilion