Abstract: The present invention is directed to improved processes for making antibody conjugates with effector moieties, wherein the conjugation reaction is carried out in a solution comprising an alcohol. The alcohol solvated conjugation reaction may be conducted at room temperature and/or in a single-pot enclosed system that minimizes the safety risks of conjugating highly cytotoxic agents. The disclosed conjugation process is capable of producing high monomer content, commercial scale quantities of antibody conjugates in a single batch.