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Die bisher bekannt gewordenen Befunde über die Niederdruck (ND)‐Olefinpolymerisation lassen sich unter dem einheitlichen Gesichtspunkt verstehen, daß die Polymerisation innerhalb eines „electron deficient”︁‐Komplexes abläuft.

KARL WINNACKERz u m 6 0 . G e b u r t s t a g a m 21. S e p t e m b e r 1 9 6 3 g e w i d m e t

In a series of investigations of the absorption spectra of simple polyatomic molecules in the photographic infra-red we have included methylacetylene (CH3C0H) for investigation because it seems interesting from two points of view: (1) As it was to bo expected that the molecule represents a symmetrical top its investigation could serve as a check on the theory of the rotational structure of symmetrical tops in general which, so far, in the photographic infra-red, had been rather unsatisfactory. (2) As all the other nuclear distances in the molecule except the C-C single bond distance were known from the investigation of other molecules, it was hoped to obtain an accurate value for the C-C single bond distance from the moment of inertia of methylacetylene, which can be determined spectroscopically. EXPERIMENTALThe absorption tubes, grating spectrograph, infra-red plates, etc. were the* same as in several previous investigations (10,11). The methylacetylene was prepared from propylene bromide and potassium hydroxide. QUALITATIVE DISCUSSION OF THE METHYLACETYLENE BAND AND OF THE STRUCTURE OF THE MOLECULEIn tht1 whole photographic infra-red up to 12,000 A.U. only one absorption band was found.