The interaction of dichlorocarbene with imines and ketene imines was studied by means of the MNDO method. The results indicate that the lack of ylide cyclization products in the reactions of dichlorocarbene with ketene imines is due to a high reactivity of ketene imine ylides in intermolecular reactions, rather than stereoelectronic factors preventing cyclization. It was shown that the dichlorocarbene reaction with N‐benzylideneaniline resulting in gem‐dichloraziridine proceeds through transient formation of ylide.
The basic technical parameters of a series of energy efficient asynchronous motors are presented. The primary competitive advantages of the 7AVE series are indicated. The main modifications and special ized variants produced based on it are listed. It is noted that modern designs are more efficient (in comparable energy efficiency classes) than the previously produced AIR and 5A series. The definition of the term "service factor" is clarified. The problems of choosing the rational outer diameter of stator cores are discussed. The advantages of CENELEC matching for implementing the highest classes of energy efficiency of low and medium power asynchronous motors are noted. The issue of the potential to design asynchronous motors of an ultrahigh energy efficiency class (IE4) is touched upon. The calculated parameters of a motor type with the IE4 efficiency class are presented.
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