1: methacrylic acid anhydride; 4-hydroxy-benzophenone With 2,4-dimethyl-6-tert-butyl-phenol; sulfuric acid; 4-methoxy-phenol T=90°C; 6 h; Air introduction; 2: methanol With sodium hydroxide in water T=60°C; 1 h;
Randall; Benger; Groocock
Proceedings of the Royal Society of London, Series A: Mathematical, Physical and Engineering Sciences, 1938 , vol. 165, p. 439
Chem. Zentralbl., 1939 , vol. 110, # I p. 911
