Raman Spectra of Deuterobenzenes and the Structure of Benzene

THE letter by Klit and Langseth in NATURE of June 8 (p. 956), recording Raman frequencies of some deuterobenzenes, leads us to report our own results so far as these overlap, although we had wished to reserve publication until the problem of which these spectra supply only part of the answer had been fully solved. Klit and Langseth record 8 lines for C 6 D 6 , and 1 for each of G 6 H 5 D and C 6 HD 5 (not obtained pure). This note relates to C 6 D 6 and C 6 H 5 D (both pure); we have not prepared C 6 HD 5 ; we have, however, examined 1:4–C 6 H 4 D 2 and hope to study 1:3:5–C 6 H 3 D 3 also, for the following reason.