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july 1959 SYNTHESES AND SPECTRA OF NAPHTHYLCYCLOALKENES 949 0 This absorption peak, caused by C-D stretching, is only moderately strong.itself (measured in carbon tetrachloride solution, 200 mg. per ml. of solution) in the range 1.5-11.5 microns are given in Table II.Mass spectrometry. The mass spectra of the deuterated biphenyls were determined with a modified Consolidated Electrodynamics Corporation model 21-620 mass spec-trometer. The mass spectra of the compounds are discussed elsewhere.27