Wiley; Knabeschuh Journal of Organic Chemistry, 1953 , vol. 18, p. 836,839 Full Text Show Details Diels; Alder Justus Liebigs Annalen der Chemie, 1932 , vol. 498, p. 16,26, 46 Justus Liebigs Annalen der Chemie, 1933 , vol. 505, p. 103,110, 132