Organic Extra Flashcards

1
Q

What is TMS

A

Used as the standard reference - gives a chemical shift value of 0ppm
Allows mapping of carbon and hydrogen - no need for chemical tests/destroying the molecule ; TMS is inert with hydrogen all in the same environment

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2
Q

Why are deuterated solvents used

A

Because 1H is replaced by heavy water : 2H - produces no NMR signal in the frequency ranges

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3
Q

What is most common solvent?

A

CDCl3 - still produces a peak in carbon-13 spectrum but it filters out this peak before displaying the spectrum

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4
Q

What do scientists do to identify OH/NH protons?

A

They have variable chemical shifts + not involved in spin-spin coupling ; small volume of d2o is added and the H atoms are replaced with Deuterium atoms - this will not absorb in this chemical shift range so the peak disappears

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