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).
Apple File System. Not to be confused with Apple File Service (AFS), the service implementing the Apple Filing Protocol (AFP), formerly AppleTalk Filing Protocol. Apple File System (APFS) is a file system for macOS, iOS, tvOS and watchOS that is being developed and deployed by Apple Inc. It aims to address the core issues of the existing HFS+ (also called Mac OS Extended) file system in use on these platforms today.