3928 Organometallics, Vol. 11, No. 11, 1992 -0.10 (m,lH, cyclopropyl CHI). Spectroscopic Characterization of 5-Hexenylcyclopropane. A CWl3 solution of 2a (115 mg,0.25 "01) was heated for 2 h at 40 OC, and filtzation of the resulting red solution through alumina afforded a colorless solution of 5-hexenylcyclopropane (92% yield baaed on ferrocene; 47 mg, 0.25 -01). 'H (CDC13,ferrocene as internal standard): 6 5.83 (m,lH,
