Ammonium Chloride/B(C 6F 5) 3 System Catalyzed Selective Addition of Acids to Alkynes
Wen Zhiguo, Tian Chong, Borzov Maxim V., Nie Wanli
Acta Chim. Sinica . 2016, (6): 498 -502 .  DOI: 10.6023/A16040164