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Hinsberg oxindole synthesis

The Hinsberg oxindole synthesis is a method of preparing oxindoles from the bisulfite additions of glyoxal. It is named after its inventor Oscar Hinsberg.

:[[Image:Hinsbergoxin.png|600px|Hinsberg indole synthesis]]

References

Elderfield, R.C.. (1952). "Heterocyclic Compounds".
(15 June 2010). "Revisiting the Hinsberg Reaction: Facile and Expeditious Synthesis of 3-Substituted Quinoxalin-2(1H)-ones under Catalyst-Free Conditions in Water". Helvetica Chimica Acta.
Hinsberg, O.. (1888). "Ueber die Einwirkung der Natriumbisulfitverbindung des Glyoxals auf aromatische Monamine". Ber. Dtsch. Chem. Ges..
(January 1898). "Synthese von Naphtindolderivaten". Berichte der Deutschen Chemischen Gesellschaft.
Hinsberg, O.. (1908). "Über Glykokoll und Indol-derivate". Ber. Dtsch. Chem. Ges..

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