The Electron Diffraction Investigation of Propargyl Chloride, Bromide, and Iodide

The surprising discovery that the carbon-carbon single-bond distance in methylacetylene and some related substances is less than the normal value suggested that the study of the propargyl halides would be of interest. We have carried out this study, and have found that the carbon-carbon triple-bond and single-bond distances are the same in these molecules as in methylacetylene, and that the carbon-halogen bond distances are somewhat larger than normal.