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

Analysis: C₇H₁₂Br MW = 171.04


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: 
IUPAC Name: bromomethyl benzene (benzyl bromide)
MS 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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