Question

CHM 2845 (FA19) 5. The MS spectrum of a compound with formular C,H,O is shown below, Let's analyze it and deduce the structure step by step. (2 pts) MASS SPECTRUM 100 13 a. The element of unsaturation is 5 U : 209+2 - ID b. The peak at m/z=91 (combined with the EU above) strongly suggests a fragment. 134 c. The base peak at m/z-43 suggests two possibilities: and_ d. Finally the predicted structure must satisfy the EU 0.01 de 120 - 160 and the numbers of atoms and types of elements in the m/z formula. Therefore one of the fragments in c can be excluded. The structure of the compound should be (draw it below) WL 0.0

Answer 1

as the element of Unsaturation is s ((91) - 10 by the peak at m/2 =91 strongly suggents a TROPYLIUM CATION Arcogmantot of The Base Peak at m/ 2 = 43 or ? Bossibilities : AGYLIUM (11,6% =o) and ISOPROPYL (com ) dy Since, the Element of Unsaturation is 5. and the Molecular Formula is Ca Ho O, the only Structure of the Compound, according to the Mass Spectrum is