Wagner-Jauregg Reaction

T. Wagner-Jauregg, Ber. 63, 3213 (1930); Ann. 491, 1 (1931).

Addition of maleic anhydride to diarylethylenes with formation of bis adducts which can be converted to aromatic ring systems:

F. Bergmann et al., J. Am. Chem. Soc. 69, 1773, 1777, 1779 (1947); K. Alder in Newer Methods of Preparative Organic Chemistry, English Ed. (Interscience, New York, 1948) p 425; M. C. Kloetzel, Org. React. 4, 32 (1948). Cf. Diels-Alder Reaction.