The structure of a ketone formed in 73% yield in the pinacol re-arrangement which proceeds by the way of more stable of the two carbocations formed of the given vicinal diol is to be chosen. Concept Introduction: During pinacol re-arrangement, a diol is converted to a ketone. The reaction begins by protonation of one of the hydroxyl groups. The loss of hydroxyl group produces initial carbocation. The initial carbocation results in the most stable carbocation. In the next step, the water molecule departs, and an alkyl group from the adjacent carbon atom migrates to its position. A new carbocation is created, where the hydroxyl group is attached to the carbon bearing the positive charge. The unshared electrons pair on this hydroxyl group stabilizes the carbocation. The final step is the formation of a carbonyl group and abstraction of a proton from the oxygen atom.

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Definition Definition Organic compounds that have a carbonyl group, C = O, as their functional group. The carbonyl group in ketones is placed somewhere in the middle of the molecular structure, which means, the C=O is attached to two alkyl groups or benzene rings. Just like all other homologous series, the naming of ketones is done using a common suffix “-one”. The general molecular formula is C n H 2n O. Functional group of a ketone

Chapter 16, Problem 46DSP

Interpretation Introduction

Interpretation:

The structure of a ketone formed in 73% yield in the pinacol re-arrangement which proceeds by the way of more stable of the two carbocations formed of the given vicinal diol is to be chosen.

Concept Introduction:

During pinacol re-arrangement, a diol is converted to a ketone.

The reaction begins by protonation of one of the hydroxyl groups.

The loss of hydroxyl group produces initial carbocation. The initial carbocation results in the most stable carbocation.

In the next step, the water molecule departs, and an alkyl group from the adjacent carbon atom migrates to its position.

A new carbocation is created, where the hydroxyl group is attached to the carbon bearing the positive charge.

The unshared electrons pair on this hydroxyl group stabilizes the carbocation.

The final step is the formation of a carbonyl group and abstraction of a proton from the oxygen atom.

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(a 4 shows scanning electron microscope (SEM) images of extruded actions of packing bed for two capillary columns of different diameters, al 750 (bottom image) and b) 30-μm-i.d. Both columns are packed with the same stationary phase, spherical particles with 1-um diameter. A) When the columns were prepared, the figure shows that the column with the larger diameter has more packing irregularities. Explain this observation. B) Predict what affect this should have on band broadening and discuss your prediction using the van Deemter terms. C) Does this figure support your explanations in application question 33? Explain why or why not and make any changes in your answers in light of this figure. Figure 4 SEM images of sections of packed columns for a) 750 and b) 30-um-i.d. capillary columns.³

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34. Figure 3 shows Van Deemter plots for a solute molecule using different column inner diameters (i.d.). A) Predict whether decreasing the column inner diameters increase or decrease bandwidth. B) Predict which van Deemter equation coefficient (A, B, or C) has the greatest effect on increasing or decreasing bandwidth as a function of i.d. and justify your answer. Figure 3 Van Deemter plots for hydroquinone using different column inner diameters (i.d. in μm). The data was obtained from liquid chromatography experiments using fused-silica capillary columns packed with 1.0-μm particles. 35 20 H(um) 큰 20 15 90 0+ 1500 100 75 550 01 02 594 05 μ(cm/sec) 30 15 10

Answer 2

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Definition Definition Organic compounds that have a carbonyl group, C = O, as their functional group. The carbonyl group in ketones is placed somewhere in the middle of the molecular structure, which means, the C=O is attached to two alkyl groups or benzene rings. Just like all other homologous series, the naming of ketones is done using a common suffix “-one”. The general molecular formula is C n H 2n O. Functional group of a ketone

Chapter 16, Problem 46DSP

Interpretation Introduction

Interpretation:

The structure of a ketone formed in 73% yield in the pinacol re-arrangement which proceeds by the way of more stable of the two carbocations formed of the given vicinal diol is to be chosen.

Concept Introduction:

During pinacol re-arrangement, a diol is converted to a ketone.

The reaction begins by protonation of one of the hydroxyl groups.

The loss of hydroxyl group produces initial carbocation. The initial carbocation results in the most stable carbocation.

In the next step, the water molecule departs, and an alkyl group from the adjacent carbon atom migrates to its position.

A new carbocation is created, where the hydroxyl group is attached to the carbon bearing the positive charge.

The unshared electrons pair on this hydroxyl group stabilizes the carbocation.

The final step is the formation of a carbonyl group and abstraction of a proton from the oxygen atom.

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Answer 3

Question

Definition Definition Organic compounds that have a carbonyl group, C = O, as their functional group. The carbonyl group in ketones is placed somewhere in the middle of the molecular structure, which means, the C=O is attached to two alkyl groups or benzene rings. Just like all other homologous series, the naming of ketones is done using a common suffix “-one”. The general molecular formula is C n H 2n O. Functional group of a ketone

Chapter 16, Problem 46DSP

Interpretation Introduction

Interpretation:

The structure of a ketone formed in 73% yield in the pinacol re-arrangement which proceeds by the way of more stable of the two carbocations formed of the given vicinal diol is to be chosen.

Concept Introduction:

During pinacol re-arrangement, a diol is converted to a ketone.

The reaction begins by protonation of one of the hydroxyl groups.

The loss of hydroxyl group produces initial carbocation. The initial carbocation results in the most stable carbocation.

In the next step, the water molecule departs, and an alkyl group from the adjacent carbon atom migrates to its position.

A new carbocation is created, where the hydroxyl group is attached to the carbon bearing the positive charge.

The unshared electrons pair on this hydroxyl group stabilizes the carbocation.

The final step is the formation of a carbonyl group and abstraction of a proton from the oxygen atom.

Expert Solution & Answer

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Check out a sample textbook solution

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Answer 4

Question

Definition Definition Organic compounds that have a carbonyl group, C = O, as their functional group. The carbonyl group in ketones is placed somewhere in the middle of the molecular structure, which means, the C=O is attached to two alkyl groups or benzene rings. Just like all other homologous series, the naming of ketones is done using a common suffix “-one”. The general molecular formula is C n H 2n O. Functional group of a ketone

Chapter 16, Problem 46DSP

Interpretation Introduction