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1. Exploring the Border between Concerted and Two-Step Pathways of 1,3-Dipolar Cycloadditions of Organic Azides to Cyclic Ketene N,X-Acetals. Synthesis and 15N-NMR Spectra of Zwitterions and Spirocyclic CycloadductsMost of the results are parts of the Ph. D. Theses by M. Ach (1992), T. Hergenrther (1992), and D. Regnat (1990), and the Diploma Thesis (1990) and unpublished results (199192) by J. Balthasar, Universitt Wrzburg.

Author

Helmut Quast, Manfred Ach, Thomas Hergenrther, Dieter Regnat, Jens Lehmann, and Klaus Banert

Published
2005

2. 5-Alkylamino-1H-1,2,3-triazoles by Base-Mediated Cleavage of Cycloadducts of Azides to Cyclic Ketene N,N-Acetals.

Author

Helmut Quast

Abstract

1,4,5-Trialkyltetrazolium salts are convenient synthetic equivalents for hypothetical secondary ynamines in cycloaddition reactions to azides. Thus, the tetrazolium salts are converted into alkylaminotriazoles via deprotonation, cycloaddition to azides, and subsequent base-mediated cleavage of the resulting spirocyclic cycloadducts. [ABSTRACT FROM AUTHOR]

Published
2006
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