... 5; W.von E. Doering, M. Pomerantz; For the synthesis by this method of a very highly strained molecule, 2,4-dimethyl-tricyclo[1.1.1.0 2,4 ]-pentan-5-one, see Tetrahedron Letters (1964), p. 961. ... Abstr., 43 (1949), p. 5416. 21; KC Murdock, RB Angier; ... Chem. Zentr., II (1909), p. 2146. ...