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Published August 1946 | Published
Journal Article Open

An Electron Diffraction Investigation of Dimethylketene Dimer


An electron diffraction investigation of dimethylketene dimer confirms the 2,2,4,4-tetramethylcyclobutadione-1,3 structure. The following parameters were determined for the symmetrical model: C[Single Bond]C (ring)=1.56±0.05A, C[Single Bond]CH3=1.54±0.05A, C[Double Bond]O=1.22±0.04A, [angle]C[Single Bond]CO[Single Bond]C=93°±6°, and [angle]CH3[Single Bond]C[Single Bond]CH3=111°±6°. The limits of error assigned to the angles apply only if simultaneous variation is excluded; otherwise much larger limits must be assigned. A notable feature of the structure is the large temperature factor which must be ascribed to the interatomic distances greater than 3A. The relation of this temperature factor to the unusually large atom polarization is discussed in terms of the probable amplitudes of the pertinent modes of vibration of the molecule.

Additional Information

Copyright © 1946 American Institute of Physics. Received April 17, 1946. We wish to thank Professor Linus Pauling for his interest and encouragement, and Dr. Robert Rasmussen of Shell Development Company for his courtesy in providing us with the sample of dimethylketene dimer. Contribution from the Gates and Crellin Laboratories of Chemistry, California Institute of Technology, Pasadena, California, No. 1060.

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August 21, 2023
October 17, 2023