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#1 2012-07-04 16:14:20

orgopete
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Products from an alpha cleavage of an alcohol in mass spectrum

What two m/z peaks would form in the mass spec of 2 methyl 3 pentanol (molar mass 102) from fragmentation leading to formation of acyl cations? (alpha clevage?) write two numbers.

The electron impact MS knocks an electron off the parent. The result in a compound with a one electron bond. This one electron bond can easily break to form a radical and a cation. The position of that cleavage occurs most frequently to give a stabilized or most stable cation. In this case, you can draw a resonance structure using the non-bonded electrons of the oxygen to give the equivalent of a protonated carbonyl compound.

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