Synthesis [edit]. Quaternary ammonium compounds are prepared by the alkylation of tertiary amines with a halocarbon. In older literature this is often called a Menshutkin reaction, however modern chemists usually refer to it simply as quaternization.uaternary ammonium compounds have also been shown to have antimicrobial activity. Certain quaternary ammonium compounds, especially those containing long alkyl chains, are used as antimicrobials and disinfectants.
Answer: XPF files are Uncommon Files primarily associated with XaoS Position File (Jan Hubicka Thomas Marsh Zoltan Kovacs and Others).
Files with the .xtg extension are called Extensible TreeGraph Files developed by Ben StÃ¶ver. These files are created using the TreeGraph 2 software. This software is a program for building and annotating phylogenetic trees which means that users can freely apply numerous graphical formats to their trees.