copper trifluoromethanesulfonate in 1,2-dichloro-ethane
T=20°C; Cycloaddition; Cyclopropanation; Product distribution; Further Variations:also in the presence of various ligands;
Harding; Haworth; Perkin
Journal of the Chemical Society, 1908 , vol. 93, p. 1968
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Wallach; v. Martius
Chemische Berichte, 1909 , vol. 42, p. 146
Justus Liebigs Annalen der Chemie, 1909 , vol. 365, p. 275