The product of the Diels-Alder reaction of benzyne with cyclopentadiene is to be predicted. Concept introduction: The Diels-Alder reaction is a cycloaddition reaction in which there is a [ 4 + 2 ] cycloaddition takes place between a substituted alkene and a conjugated diene referred to as dienophile and results in the formation of substituted cyclohexene system.

Question

(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

Answer 1

Question

Chapter 17.12B, Problem 17.24P

Interpretation Introduction

Interpretation:

The product of the Diels-Alder reaction of benzyne with cyclopentadiene is to be predicted.

Concept introduction:

The Diels-Alder reaction is a cycloaddition reaction in which there is a [4+2] cycloaddition takes place between a substituted alkene and a conjugated diene referred to as dienophile and results in the formation of substituted cyclohexene system.

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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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