562813-17-6Relevant articles and documents
Sonogashira coupling reaction with diminished homocoupling
Elangovan, Arumugasamy,Wang, Yu-Hsiang,Ho, Tong-Ing
, p. 1841 - 1844 (2007/10/03)
(Matrix presented) The side product from homocoupling reaction of two terminal acetylenes in the Sonogashira reaction can be reduced to about 2% using an atmosphere of hydrogen gas diluted with nitrogen or argon. Terminal arylethynes, diarylethynes, and a few new arylpyridylethynes with donor substituents have been synthesized in very good yields. Comparative control experiments suggest that the homocoupling yield is determined by concentration of both catalyst and oxygen.