Karl Barry Sharpless (born April 28, 1941) is an American chemist renowned for his work on organometallic chemistry.

In 2001 he won the Nobel Prize in Chemistry for his work on stereoselective oxidation reactions (Sharpless epoxidation, Sharpless bishydroxylation, Sharpless aminohydroxylation). This prize was shared with William S. Knowles and Ryoji Noyori (for their work on stereoselective hydrogenation). Currently he spends much of his time promoting click chemistry which are selective, exothermic reactions which occur under mild conditions in water; the most successful variant of which is the alkyne-azide (3 + 2) cycloaddition to form 1,2,3-triazoles.

Sharpless was born in Philadelphia. He graduated from Friends' Central School in 1959. He continued his studies at Dartmouth College (1963) and earned his Ph.D from Stanford University in 1965. He continued post-doctoral work at Stanford University and Harvard University.

Sharpless has been a professor at the Massachusetts Institute of Technology and Stanford University. He currently holds the W. M. Keck professorship in chemistry at The Scripps Research Institute.

American chemists | 1941 births | Dartmouth College alumni | Living people | Nobel Prize in Chemistry winners | Members and associates of the US National Academy of Sciences

K. Barry Sharpless | K. Barry Sharpless | K. Barry Sharpless | K. Barry Sharpless | バリー・シャープレス | Barry Sharpless | K. Barry Sharpless | K. Barry Sharpless