Raman Spectrum of Deuterobenzene

WE have photographed the Raman spectra of the various deuterobenzenes. In order to obtain the isotopic shifts of the Raman frequencies with a fair accuracy, the spectra were investigated with high dispersion, which necessitates a rather large volume of the substance; the Raman tube employed contained 18 c.c. For the preparation of deuterobenzene we have investigated various possible exchange reactions and have finally chosen the Friedel-Craft reaction: