The structure of the initial alkene , which could have been used in the reaction with molecular chlorine in carbon tetrachloride yielding a racemic mixture of ( R, R ) - 3, 4 - dichloro - 2 - methylhexane and its enantiomer, is to be drawn. Concept introduction: Alkene reacts with molecular halide in carbon tetrachloride (CCl 4 ) to yield a mixture of dihaloalkanes. Molecular halide undergoes anti addition across a carbon-carbon double bond. To account for the stereochemistry of the reaction, the mechanism must proceed through a cyclic halonium ion intermediate. If the mixture of products is diastereomers, then the mixture would be optically active. If the products are either enantiomers or a meso compound, then the mixture is optically inactive. A symmetrically substituted alkene may yield a meso compound, which would be optically inactive.

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 12, Problem 12.7P

Interpretation Introduction

Interpretation:

The structure of the initial alkene, which could have been used in the reaction with molecular chlorine in carbon tetrachloride yielding a racemic mixture of

(R, R)- 3, 4 - dichloro - 2 - methylhexane and its enantiomer, is to be drawn.

Concept introduction:

Alkene reacts with molecular halide in carbon tetrachloride (CCl4) to yield a mixture of dihaloalkanes. Molecular halide undergoes anti addition across a carbon-carbon double bond. To account for the stereochemistry of the reaction, the mechanism must proceed through a cyclic halonium ion intermediate. If the mixture of products is diastereomers, then the mixture would be optically active. If the products are either enantiomers or a meso compound, then the mixture is optically inactive. A symmetrically substituted alkene may yield a meso compound, which would be optically inactive.

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