Charles Frederick Koelsch | |
---|---|
Born | |
Died | December 24, 1999 92) | (aged
Scientific career | |
Fields | Organic chemistry, synthetic chemistry |
Institutions | University of Minnesota |
Doctoral advisor | Samuel M. McElvain |
Notable students | Virgil Boekelheide |
Charles Frederick Koelsch (31 January 1907 - 24 December 1999) was an American organic chemist who spent his faculty career at the University of Minnesota. [1] [2] [3]
Koelsch was born in Boise, Idaho in 1907 in a family of German descent. [3] He attended the University of Wisconsin and earned his bachelor's degree in 1928 and his Ph.D. from the same institution in 1931, working under the supervision of Samuel M. McElvain. [2] [3] After a postdoctoral fellowship at Harvard University with Elmer Peter Kohler, Koelsch was recommended for a position at the University of Minnesota by Lee Irvin Smith. [3] He joined the faculty there as an instructor in 1932 and became an assistant professor in 1934. Koelsch was awarded the ACS Award in Pure Chemistry in 1934. [3] [2] He advanced to associate professor in 1937 and full professor in 1946. [1] He remained at the University of Minnesota until his retirement, assuming professor emeritus status, in 1973. [1] [3] Through much of his academic career, Koelsch also served as an industry consultant, working first with Smith, Kline & French and later with Sterling Drug and Union Carbide. [3]
During his work at Harvard, Koelsch attempted to publish a paper describing an unusually stable radical compound, but it was rejected at the time on the grounds that the compound's properties were unlikely to describe a radical. Subsequent experimental evidence and quantum mechanics calculations suggested his interpretation of the original experiment was correct, resulting in the publication of the paper nearly 25 years after the original experiments. [3] [4] The compound - 1,3‐bisdiphenylene‐2‐phenylallyl (BDPA) - is now often referred to as the "Koelsch radical". [5] [6]
Koelsch married his wife Helen in 1938 and the couple had three children. He was a ham radio enthusiast. [2] [3] He died in Rochester, Minnesota in 1999. [2]
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