The influence of substituents on the polarity of vinylic CH bonds of 3,3-disubstituted cyclopropenes was studied by analysis of the integral absorption intensities of infrared bands. The influence of intermolecular interactions in solutions of cyclopropenes in non-polar solvents on integral intensities has been determined. The dipole moments of the vinylic bonds were determined starting from infrared band intensities. The experimental data were compared with CNDO/S3 calculations. High sensitivity of intensities and frequencies of the absorption bands to the changes in electron acceptor character of substituent has been found. Correlations were established between dipole moment values of vinylic bonds, determined from experiment and on the basis of CNDO/S3 calculations, as well as between stretching vibrational frequencies on the one hand and values of substituent constants on the other.