What Is Chemical Shift

Average Values of Chemical Shifts of Representative Types of Hydrogens 

Notice that most of the values shown fall within a rather narrow range from 0 to 13 S units (ppm). In fact, although the table shows a variety of functional groups and hydrogens bonded to them, we can use the following rules of thumb to remember the chemical shifts of most types of hydrogen  

8 H bonded to an sp carbon that is at an allylic or benzylic position (i.e., adjacent to a C—C double bond or a benzene ring). 

5 H bonded to an sp carbon that is close to an electronegative element such as N, 0, or X.The more electronegative the element, the higher is the chemical shift. Also, the closer the electronegative atom, the higher is the chemical shift. 

Following are two constitutional isomers with the molecular formula C6H12O2  

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What Is Chemical Shift 11A Infrared Spectroscopy A Window on Brain Activity... 

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