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Harger has found that the alkyl groups migrate preferentially to aryl groups, and this preference increases in the order methyl < primary < secondary < tertiary. This is probably due to steric and conformational factors, as the bulkier the R-group, the less favorable the conformation for phenyl migration. [20] … See more The Curtius rearrangement (or Curtius reaction or Curtius degradation), first defined by Theodor Curtius in 1885, is the thermal decomposition of an acyl azide to an isocyanate with loss of nitrogen gas. The isocyanate then … See more It was believed that the Curtius rearrangement was a two-step processes, with the loss of nitrogen gas forming an acyl nitrene, … See more Darapsky degradation In one variation called the Darapsky degradation, or Darapsky synthesis, a Curtius rearrangement takes place as one of the steps in the … See more In their synthesis of the antiviral drug oseltamivir, also known as Tamiflu, Ishikawa et al. used the Curtius rearrangement in … See more The acyl azide is usually made from the reaction of acid chlorides or anydrides with sodium azide or trimethylsilyl azide. Acyl azides are also obtained from treating acylhydrazines with nitrous acid. Alternatively, the acyl azide can be formed by the direct … See more Research has shown that the Curtius rearrangement is catalyzed by both Brønsted and Lewis acids, via the protonation of, or … See more The Curtius rearrangement is tolerant of a large variety of functional groups, and has significant synthetic utility, as many different groups … See more WebDr. Beverly Harger is a chiropractic radiologist with more than 30 years of clinical experience. In 1992, she completed her radiology residency at University of Western … troy morris md southaven ms
Formation of 9,10-phenanthrenequinone by atmospheric gas-phase ...
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