Hinsberg Oxindole Synthesis.

O. Hinsberg, Ber. 21,110 (1888); 25, 2545 (1892); 41,1367 (1908)
O. Hinsberg and J. Rosenzweig, Ber. 27, 32S3 (1894)
C. Hollins, Synthesis of Nitrogen Ring Compounds, p 112 (Londoln, 1924)
H. Burton, J. Chem. Soc. 1932, 546
R. C. Elderfield, Heterocyclic Compounds 3, p 139 (New York, 1952)

Also see: Friedel-Crafts Reaction , Stolle Synthesis

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