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Friday, 5 December 2014

Mass spectroscopy...........bromomethyl benzene (benzyl bromide)




Analysis: C7H12Br MW = 171.04

Mass Spectrum
The spectrum shows two small peaks of equal intensity in the molecular ion region, strongly suggesting that the molecule contains bromine (equal concentrations of the 79Br and 81Br isotopes). The base peak represents loss of this bromine to give the peak at m/e = 91, which is highly suggestive of a benzyl fragment.


Structure: structure
IUPAC Name: bromomethyl benzene (benzyl bromide)
MS Fragments:
fragments

The spectrum shows two small peaks of equal intensity in the molecular ion region, strongly suggesting that the molecule contains bromine (equal concentrations of the 79Br and 81Br isotopes ). The base peak represents loss of this bromine to give the peak at m/e = 91, which is highly suggestive of a benzyl fragment, which rearranges to form the tropylium cation.








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