Dibutyl ether is most commonly used as a solvent for Grignard reactions because of it’s aprotic qualities. Dibutyl ether is also used as a solvent for the formulation of pesticides.
Mattteson, D. & Peacock, K.: J. Org. Chem., 28, 369 (1963); Polon, J. & Sawyer Jr., E.: J. Agric. Food Chem., 10, 244 (1962)