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Fischer–Hepp rearrangement : ウィキペディア英語版
Fischer–Hepp rearrangement

The Fischer–Hepp rearrangement is a rearrangement reaction in which an aromatic N-nitroso or nitrosamine converts to a carbon nitroso compound:〔O Fischer, E Hepp. ''Ber Deutsch chem Ges'' 19 (1886) p2991〕〔M B Smith, J March. ''March's Advanced Organic Chemistry'' (Wiley, 2001) (ISBN 0-471-58589-0)〕
This organic reaction was first described by the German chemist Otto Philipp Fischer (1852–1932 ) and
Eduard Hepp (June 11, 1851 – June 18, 1917) 〔W Pötsch. ''Lexikon bedeutender Chemiker'' (VEB Bibliographisches Institut Leipzig, 1989) (ISBN 3817110553〕 in 1886, and is of importance because para-NO secondary anilines cannot be prepared in a direct reaction.
The rearrangement reaction takes place by reacting the nitrosamine precursor with hydrochloric acid. The chemical yield is generally good under these conditions, but often much poorer if a different acid is used. The exact reaction mechanism is unknown but there is evidence suggesting an intramolecular reaction.
==Sources==

*(''Named Things in Chemical Industry'' )

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