15E.7 Flashcards
What are the two types of 1H NMR
- low resolution (not used anymore)
- high resolution
why does a peak from at 0 for 13C NMR
this is due to TMS and should be ignored
what do we see in a low resolution 1H NMR of a compound
a straight horizontal line just about the x axis ranging form 12 ppm form the left to zero ppm on the right, with vertical peaks produced by the 1H amounts in the molecule
what does the peak in 1H NMR shows
it shows the presence presence of a hydrogen (proton) atom in a specific chemical environment
the number of peaks in the 1H NMR spectrum LC shows
the different chemical environments of the hydrogen atoms in the molecule, but not the total number of hydrogen atoms
what does the position of the peaks 1H NMR spectrum LC tell us
the chemical shifts of each hydrogen atom, and with reference to the chart of chemical shifts, we can deduce the type of chemical environment
the area under the peaks in 1H NMR spectrum LC represent
the relative number of H atoms in the environment
the number beside the peak in 1H NMR spectrum LC shows
the area under the peak
what is another way to represent the relative areas of the peaks in 1H NMR spectrum LC
by using an integration trace
what is the integration trace
it is line that shows the relative number of equivalent protons (in the same chemical environment)
how does the integration trace look like
a straight horizontal like that becomes higher as it passes each peak, the increase in height can be
the increase in height of the Integration trace represent
the relative areas under the peaks
the chemical shift of halogenoalkane increases
as the halogen attached goes up the group
the chemical shift of alkanes increase as
tertiary > secondary > primary
if one of the peak in a 1H NMR spectrum is in the range of alkenes then
there is a H group attached to the functional group
