MHz, CDC13) 6 12.04 (carboxyl, s, 1 H) and 1.41-0.62 (methyl and cyclopropyl, m, 9 H)] and IR spectra [(neat film) i& 3520-3160, UC-H 2880, VC= O 1695, and VC. 0 1240 cm-l], as well as from the electron impact mass spectrum (70 eV) of the corresponding methyl ester (from a diazomethane treatment)[m/e 128 (M+), 113 (M+-CH3), 97 (M+-CH30), and 69 (M+-CH~ COZ)].(-)-c-2, t-3-Dimethyl-r-1-cyclopropanecarboxylic Acid