Structure: 
IUPAC Name: 3-pentanone (diethyl ketone)
Analysis: C9H10O MW = 134.18
The spectrum shows a moderate molecular ion peak, and a peak at m-15, strongly suggesting the presence of a labile methyl group. The base peak occurs at m/e = 91, which is highly suggestive of a benzyl fragment. The presence of an intense peak at m/e = 43 is also suggestive of the presence of a methyl ketone, which can fragment to form the acylium ion.
MS Fragments:
The spectrum shows a moderate molecular ion peak, and a peak at m-15, strongly suggesting the presence of a labile methyl group. The base peak occurs at m/e = 91, which is highly suggestive of a benzyl fragment, which rearranges to form the tropylium cation. The presence of an intense peak at m/e = 43 is also suggestive of the presence of a methyl ketone which can fragment to form the acylium ion.
IUPAC Name: 3-pentanone (diethyl ketone)
Analysis: C9H10O MW = 134.18
The spectrum shows a moderate molecular ion peak, and a peak at m-15, strongly suggesting the presence of a labile methyl group. The base peak occurs at m/e = 91, which is highly suggestive of a benzyl fragment. The presence of an intense peak at m/e = 43 is also suggestive of the presence of a methyl ketone, which can fragment to form the acylium ion.
MS Fragments:
The spectrum shows a moderate molecular ion peak, and a peak at m-15, strongly suggesting the presence of a labile methyl group. The base peak occurs at m/e = 91, which is highly suggestive of a benzyl fragment, which rearranges to form the tropylium cation. The presence of an intense peak at m/e = 43 is also suggestive of the presence of a methyl ketone which can fragment to form the acylium ion.
1-phenylpropanone. No 3 pentanone
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