3 96 FREDERIC RICHTER AND G. FREDERICK SMITH ... Comments For double bond displacement chromia-coated (5) Bjelouss, Bcr., 43, 2332 (1910). (6) v. Auwers and Westermann, rbrd., 54, 2993 (1921) (7) Henne and Hill, THIS JOURNAL, 66, 752 (1943). (8) Henne and Perilstein. +bid , 66, 2183 (19.13) ... Summary Twelve dienes of the l,&type were subjected to double bond shift at 250' over a catalyst made of chromia and alumina. Seven were trans- formed to ...