Synthesis of nitronyl- and imino-nitroxide-triradicals interconnected by phenyl ethynyl spacer

doi:10.1016/S0040-4039(99)02218-2

Tetrahedron Letters

Volume 41, Issue 7, 12 February 2000, Pages 1015-1018

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Abstract

The design and synthesis, as well as solid state and ESR characterisation of three new triradicals based on phenyl ethynyl backbone bearing nitronyl-nitroxide and imino-nitroxide groups, are reported. The synthesis of these compounds was based on palladium-coupling reactions between alkynyl and bromo derivatives. An ESR study showed magnetic interactions between the radicals through the phenyl ethynyl-coupling unit in solution.

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Acknowledgements

We thank CNRS and COST D4 for the financial support. Thanks to R. Poinsot for the SQUID measurements.

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