D&L and R&S

[DJtiesto]

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I am a little confused...I sometimes see that there is no relation between the R and S nomenclature with the D & L but them when I am doing carbs, every sugar that is D is R and L goes with S.

So does the rule D goes with R and L goes with S only applicable to carbs?

 

[zmatrix]

For simple sugars yes. When the configuration of the #2 carbon is R, then it is a D (dextrorotatory) sugar. This is because the chirality of the #2 carbon is the major contributor to light polarization.

 

[boaz]

I am a little confused...I sometimes see that there is no relation between the R and S nomenclature with the D & L but them when I am doing carbs, every sugar that is D is R and L goes with S.

So does the rule D goes with R and L goes with S only applicable to carbs?

There is absolutely no relation between the two. It's a coincidence in certain sugars.

 

[eric51]

There is absolutely no relation between the two. It's a coincidence in certain sugars.

Correct.