The dynamics of photodissociation of propene has been investigated at 157 nm in a molecular-beam apparatus using photofragment translational spectroscopy and photoionization produced with a synchrotron. We measured angular anisotropy parameters beta of several products as a function of kinetic energy. Atomic H has an isotropic angular distribution, H-2 has a small negative beta, and fragments due to C-C bond rupture have a small positive beta. According to these measurements we suggest that the 2(1)A'(pi-3p) state has a major contribution on excitation at 157 nm. Photolysis of CD3CHCH2 reveals site effects on the angular distributions of products. (C) 2004 Elsevier B.V. All rights reserved.