D 2640 (OTTO) Diethylene glycol dibutyl ether, 99% Cas 112-73-2 - used as a solvent in Grignard reactions. D 2640 (OTTO) Diethylene glycol dibutyl ether, 99% Cas 112-73-2 - used as solvents in gold refining, decorative inks for ceramics and digital inks. It finds application in electrochemistry, gas absorption, extractant and high boiling reaction medium.