Organic Chemistry help Tetramethylsilane (TMS) is often used as a reference sign

Question

Organic Chemistry help

Tetramethylsilane (TMS) is often used as a reference signal in 1H-NMR spectroscopy. What is the main reason for this? O Somebody a long time ago decided this, and everyone else just accepted it. O Silicon is less electronegative that carbon, so the protons on the methyl groups are highly shielded, so the signal shows up out of the range of many other proton environments in organic compounds. O Silicon is more electronegative that carbon, so the protons on the methyl groups are highly shielded, so the signal shows up out of the range of many other proton environments in organic compounds.

Explanation / Answer

Ans : Silicon is less electronegative than carbon, so the protons on the methyl groups are highly shielded, so the signal shows up out of the range of many other proton environments in organic compounds.

In 1HNMR, Teteramethylsilane is used as reference. It has 12 equivalent protons. So the signal intensity would be very high and as said above, since Silicon is less electronegative than carbon, these 12 carbons are more shielded. So their signal would come more upfield without interfering with the proton signals of many organic compounds.

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