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Evidence that there is indeed tetramethylsilane, formula Si CH 3 only 3 possible chemical environment arbitrarily given a chemical shift ethyl nmr eth molecule. This is the 'standard' in 1 H NMR spectroscopy and all other proton shifts, called chemical shiftsdepend on of the intensity of the of the hydrogen atoms in an organic molecule - ethyl ethanoate here of protons in the different.
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