TheHaworth projectionsof cis and trans-1-3-dimethylcyclohexane are drawn and its stability should be comparatively explained. Concept Introduction: Haworth projection: The representation of cyclic chemical compounds by normal ring structure and the substituents can either pointing up or down on this ring is called Haworth projection . Conformational isomers: The two or more compounds have same molecular formula and different structural formulas from the result of C-C single bond rotations are called conformational isomers. The atom or group is occupy at similar to a vertical axis passing through the chair conformationof Cyclohexane ring is called axial position. The atom or group is occupy at similar to horizontal axis passing through the chair conformationof ring is called equatorial position . The substituents are occupy in equatorial position is more stable than axial because of the 1,3-diaxial interactions are less in equatorial position.

Question

Protecting Groups and Carbonyls 6) The synthesis generates allethrolone that exhibits high insect toxicity but low mammalian toxicity. They are used in pet shampoo, human lice shampoo, and industrial sprays for insects and mosquitos. Propose detailed mechanistic steps to generate the allethrolone label the different types of reagents (Grignard, acid/base protonation, acid/base deprotonation, reduction, oxidation, witting, aldol condensation, Robinson annulation, etc.) III + VI HS HS H+ CH,CH,Li III I II IV CI + P(Ph)3 V ༼ Hint: no strong base added VI S VII IX HO VIII -MgBr HgCl2,HgO HO. isomerization aqeuous solution H,SO, ༽༽༤༽༽ X MeOH Hint: enhances selectivity for reaction at the S X ☑

Answer 1

Question

Chapter 4.14, Problem 33CC

Interpretation Introduction

Interpretation:

TheHaworth projectionsof cis and trans-1-3-dimethylcyclohexane are drawn and its stability should be comparatively explained.

Concept Introduction:

Haworth projection:

The representation of cyclic chemical compounds by normal ring structure and the substituents can either pointing up or down on this ring is called Haworth projection.

Conformational isomers:

The two or more compounds have same molecular formula and different structural formulas from the result of C-C single bond rotations are called conformational isomers.

The atom or group is occupy at similar to a vertical axis passing through the chair conformationof Cyclohexane ring is called axial position.

The atom or group is occupy at similar to horizontal axis passing through the chair conformationof ring is called equatorial position.

The substituents are occupy in equatorial position is more stable than axial because of the 1,3-diaxial interactions are less in equatorial position.

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