Examples of continuous-flow gas-phase reactions involving heterogeneous catalysts can be found in several popular books on chemical demonstrations as well as in this Journal (1-5).In this article, we describe a sequence of two organic reactions involving gas-phase heterogeneous catalysts suitable for use as a laboratory experiment. In the first reactions,2-propanol is converted to propene using alumina beads as the catalyst. The product gas is purified with a mini-cold trap. In second reaction, propene is hydrogenated to propane using a palladium catalyst in neariy 100%yield.Both propene and propane are characterized by proton nuclear magnetic resonance spectroscopy (1H NMR) and both give elegant spectra that are ideally suited for interpretation by undergraduate students. This laboratory experiment is original in that gas-phase organic reactions are not usually experienced in chemistry laboratory programs. The experiment demonstrates continuous-flow, closed-system gas-phase reactions of fundamental importance in chemical industry. The experiment also demonstrates the power of NMR in the context for which it actually is used by organic and inorganic chemists : structural confirmation and analysis.