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- W1992609288 abstract "Abstract Benzonitrile 3,3-diarylallyl nitrile ylides (16), generated by the base-induced dehydrochlorination of imidoyl chlorides, cyclised by 1,7-ring closure to give 3H-2-benzazepines e.g. (19), in contrast to analogous diazo-compounds (1) which prefer 1,5-electrocyclisation. Asymmetrically placed substituents [R in (16b–e)] favour substitution at the ortho (2′) position irrespective of their polar electronic effects. Deuterium labelling studies have shown that the cyclisation step is irreversible for these nitrile ylides in contrast to the analogous diazo-compounds (3) for which it is reversible." @default.
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- W1992609288 date "1992-01-01" @default.
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- W1992609288 title "Electrocyclic aromatic substitution by nitrile ylides to give 3H-2-benzazepines: substituent effects and mechanism" @default.
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- W1992609288 doi "https://doi.org/10.1016/s0040-4020(01)80469-5" @default.
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