Acetic anhydride preparation
http://www.sciencemadness.org/talk/viewthread.php?tid=9Acétate de sodium + Monochlorure de soufre -> Anhydride Acétique
https://www.erowid.org/archive/rhodium/chemistry/anhydrides.htmlAcetic Anhydride from Vinegar: The Sulfur Chloride Route [easy !] - LabCoatz
Preparation of acetic anhydride from acetyl chloride and acetate - THYZOID LABORATORIES