The five- membered cyclic Î²- hemiactal form of D-ribulose is to be drawn. Concept introduction: The pyranose form is a cyclic hemiacetal form with a six membered ring formed by the nucleophilic addition of the â€“OH group on C 5 to the C 1 carbonyl group. The furanose form is a cyclic hemiacetal form with a five membered ring formed by the nucleophilic addition of the â€“OH group on C 5 to the C 2 carbonyl group. The orientation of â€“OH group differs in Î±- and Î²- anomers. In Î±- anomer the OH on C 1 is cis to the â€“OH at the lowest chirality center in Fischer projection, while in Î²- anomer the â€“OH on C 1 is trans to the â€“OH at the lowest chirality center in Fischer projection. D sugars have the â€“O- at C adjacent to CH 2 OH on the right in the uncoiled form while L sugars have the -O- at C adjacent to CH 2 OH on the left. To draw: The five- membered cyclic Î²- hemiactal form of D-ribulose.

Question

personality of each of them in terms of nucleophile vs. electrophile (some can be considered acids/bases but we are not looking at that here). Note you may have to use your growing intuition to figure out the personality of one of the molecules below but I believe in you! Rationalize it out based on what we have called strong versus weak electrophiles in past mechanisms. Consider using the memes below to help guide your understanding! A OH O B CH3 C Molecule A: [Select] Molecule B: [Select] Molecule C: [Select] Molecule D: [Select] > H D OH

Answer 1

Question

Chapter 25.SE, Problem 47AP

Interpretation Introduction

Interpretation:

The five- membered cyclic Î²- hemiactal form of D-ribulose is to be drawn.

Concept introduction:

The pyranose form is a cyclic hemiacetal form with a six membered ring formed by the nucleophilic addition of the â€“OH group on C₅ to the C₁ carbonyl group. The furanose form is a cyclic hemiacetal form with a five membered ring formed by the nucleophilic addition of the â€“OH group on C₅ to the C₂ carbonyl group.

The orientation of â€“OH group differs in Î±- and Î²- anomers. In Î±- anomer the OH on C₁ is cis to the â€“OH at the lowest chirality center in Fischer projection, while in Î²- anomer the â€“OH on C₁ is trans to the â€“OH at the lowest chirality center in Fischer projection.

D sugars have the â€“O- at C adjacent to CH₂OH on the right in the uncoiled form while L sugars have the -O- at C adjacent to CH₂OH on the left.

To draw:

The five- membered cyclic Î²- hemiactal form of D-ribulose.

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personality of each of them in terms of nucleophile vs. electrophile (some can be considered acids/bases but we are not looking at that here). Note you may have to use your growing intuition to figure out the personality of one of the molecules below but I believe in you! Rationalize it out based on what we have called strong versus weak electrophiles in past mechanisms. Consider using the memes below to help guide your understanding! A OH O B CH3 C Molecule A: [Select] Molecule B: [Select] Molecule C: [Select] Molecule D: [Select] > H D OH

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