title: Chemistry of Pyrotechnics: Basic Principles and Theory
author:  John A. Conkling 
description: belongs on every pyrotechnist's bookshelf.<BR> -Pyrotechnica
zlib_text:  
  Crystals 2020, 10, 339; doi:10.3390/cryst10050339 
  www.mdpi.com/journal/crystals 
  Article 
  Novel Quaternary Ammonium Derivatives of 4-
  Pyrrolidino Pyridine: Synthesis, Structural, Thermal, 
  and Antibacterial Studies 
  Rusi Rusew 1,*, Vanya Kurteva 2 and Boris Shivachev 1 
  1 Institute of Mineralogy and Crystallography “Acad. Ivan Kostov”, Bulgarian Academy of Sciences, Acad. 
  G. Bonchev str., bl. 107, 1113 Sofia, Bulgaria; bls@clmc.bas.bg 
  2 Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G. 
  Bonchev str., bl. 9, 1113 Sofia, Bulgaria; vkurteva@orgchm.bas.bg 
  * Correspondence: r.rusev93@imc.bas.bg 
  Received: 31 March 2020; Accepted: 23 April 2020; Published: 25 April 2020 
  Abstract: Six novel quaternary ammonium derivatives of 4-pyrrolidino pyridine were prepared and 
  isolated via a facile one-pot synthesis and a simple purification procedure. The purity and the 
  molecular structure of the 4-pyrrolidino pyridine derivatives were confirm