conformational modeles of cyciopentane and cyclopentene Structure-Dinamic Modeles of Cyclopropane and Cyclopentene Authors: El’kin M. D., Dzhalmukhambetova E. A. Fashionable calculations of geometric and vibrational spectra of cyciopentane and cyclopentene are carried out. Nonplanar conformation for five-member cycle of molecule is cofirmed.