How does the (R)/(S) method work to convert Fischer projections to bond line views?

Answer 1

A bond-line view gives no stereochemical information. I presume that you want to convert a Fischer projection to a wedge-dash view using (#R"/"S#) information.

Step 1. Start with the Fischer projection of D-glucose.

Step 2. Convert this to a "bow tie" view by making all the horizontal bonds into wedges.

Step 3. Assign configurations to the chiral carbons.

The assignments are #(2R,3S,4R,5R)#.

Glucose is #(2R,3S,4R,5R)#-2,3,4,5,6-pentahydroxyhexanal.

Step 4. Draw the wedge-dash structure.

Draw a trial zig-zag structure. Arbitrarily make all the H bonds wedges and the OH bonds dashes.

Some of them will be correct. Others won't.

Assign configurations to the chiral carbons.

The assignments are #(2R,3S,4R,5S)#. Oops! Number 5 is wrong. We must interchange the wedge and dash.

We get

This is the wedge-dash structure of glucose.

Step 6. (If you really wanted this) Convert to a bond-line structure.

Omit the H atoms on the chain and convert the wedges and dashes to solid lines.

This structure could represent any of the 16 aldohexoses.

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Answer 2

The (R)/(S) method determines the absolute configuration of chiral centers in Fischer projections. To convert to bond line views, assign priorities to substituents, rotate the molecule to align the lowest priority group away, and visualize the clockwise (R) or counterclockwise (S) arrangement around the chiral center in the Fischer projection. Represent this arrangement in the bond line view.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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