Crossover Linstead macrocyclization of cycloheptatrienylmaleonitrile and (dimethylamino)-maleonitrile gave access to an unsymmetrical (A(3)B) porphyrazine bearing six peripheral amino substituents and a fused cycloheptatrienyl ring. Subsequent hydride abstraction gave a tropylium-fused aminoporphyrazine, which contains both strongly electron-donating and withdrawing groups and thus can be labelled as a 'push-pull' macrocycle. Detailed structural studies of this novel porphyrazine are described. (C) 2009 Elsevier Ltd. All rights reserved.
Steric and electronic effects on the
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H hyperpolarisation of substituted pyridazines by signal amplification by reversible exchange
作者:Peter J. Rayner、Michael J. Burns、Elizabeth J. Fear、Simon B. Duckett
DOI:10.1002/mrc.5152
日期:2021.12
rapid and cost-effective hyperpolarisation of substituted pyridazines. The 33 substrates investigated cover a range of steric and electronic properties and their capacity to perform highly effective SABRE is assessed. We find the method to be tolerant to a broad range of electron donating and withdrawing groups; however, good sensitivity is evident when steric bulk is added to the 3- and 6-positions of