M 2526 ( OTTOKEMI ) Methyllithium solution , 4 %1.4 M in diethyl ether CAS - 917-54-4 used in chemical research Methyllithium solution ( 3.1 M in diethoxymethane) can undergo 1,2-addition to benzaldehyde catalyzed by a 2-(2-hydroxyaryl)alcohol (HAROL) ligand in the presence of titanium isopropoxide to form (S)-1-phenylethan-1-o