Born 17 May 1897; died 11 May 1981 at age 83.
#Norwegian physical #chemist who shared (with Sir Derek H.R. Barton of Great Britain) the 1969 #NobelPrize for Chemistry for his work in establishing #conformational #analysis (the study of the 3-D #geometric #structure of #molecules). A ring of six #carbon atoms has two conformations - the chair and boat forms. These easily interchange - about a million times in a second at room temperature. One of the conformations is, however, strongly predominant (about 99%). Hassel carried out fundamental investigations on this system and showed how heavy or bulky groups, attached to the carbon atoms, take up their positions relative to the ring and to each other. Such work is of great importance for predicting the mode of #reaction of a certain molecule. www.masterdoctorclinic.com
