k) alkylphosphonium salts with the formula: l) alkylsulfonium salts with the formula: m) alkylisothiouronium salts with the formula: where R2 is an alkyl or hydroxyalkyl group with 1 to 50 C atoms, such as 25 to 50 C, atoms or an aryl or hydroxyaryl group with 6 to 12 C atoms.