... Aryl dichloroniethyl ethers 90(1971) RECUEIL 559 acids has already been mentioned. ... A ryl dichloromethyl ethers 90 ( 197 I) RECUEI L 561 ... (20% for electron-donating substituents; 100% for the p-NO, compound.) Mercuric chloride is added (0. I g for every 0.1 mole of formate). ...