Transcription of NMR SPECTROSCOPY OF AROMATIC COMPOUNDS
{{id}} {{{paragraph}}}
Example: quiz answers
NMR SPECTROSCOPY OF AROMATIC COMPOUNDS
37 NMR SPECTROSCOPY of AROMATIC COMPOUNDS (#1e) 1H NMR SPECTROSCOPY of AROMATIC COMPOUNDS Erich H ckel s study of aromaticity in the 1930s produced a set of rules for determining whether a compound is AROMATIC . According to the H ckel criteria, a molecule must be cyclic, nearly planar, possess a p orbital on each carbon, and have 4n + 2 electrons, where n is an integer. These factors allow one to label a molecule as AROMATIC , giving the molecule some special reactive characteristics that will be discussed in detail in your Chemistry 302 lecture. For now, the classic example of an AROMATIC compound is benzene, seen below with its 1H NMR spectrum. In AROMATIC COMPOUNDS like benzene, the protons on the AROMATIC ring are shifted downfield. For example, the six protons in benzene are magnetically and chemically equivalent and appear at ppm. This is farther downfield than alkene protons, which appear between ppm.
In aromatic compounds like benzene, the protons on the aromatic ring are shifted downfield. For example, the six protons in benzene are magnetically and chemically equivalent and appear at 7.33 ppm. This is farther downfield than alkene protons, which appear between 4.5-6.5 ppm. NMR serves as a useful tool to determine whether a compound is ...
Loading..
Tags:
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document: