Difluoromethyltrialkylammonium SaltsTheir Expeditious Synthesis from Chlorodifluoromethane and Tertiary Amines in the Presence of Concentrated Aqueous Sodium Hydroxide. The Catalytic Process
摘要:
[GRAPHICS]We found that difluorocarbene generated from chlorodifluoromethane with 50% aqueous sodium hydroxide reacts with lipophilic tertiary amines 1a-g giving difluoromethyltrialkylammonium chlorides 2a-g in high yields. Similarly, difluoromethyltrialkylammonium iodides 3h-l, nitrates 4h-k, or isothiocyanates 5i,j were synthesized from hydrophilic tertiary amines 1h-l and the corresponding sodium or potassium salts. The process is catalytic with respect to the base used.