Whether the cyclization and formation of a bicyclic product when (1Z,3Z,5Z)- 1,3,5-cyclononatriene is heated at 100ÂºC takes place in conrotatory or disrotatory manner is to be identified. Further the stereochemical relationship of the two hydrogens at the ring junction, cis or trans is to be stated. Concept introduction: An electrocyclic reaction involves the cyclization of a conjugated acyclic system. These reactions are reversible and are highly stereospecific. In elecrocyclic reactions involving even number of electron pairs, a thermal reaction occurs in conrotatory manner and a photochemical reaction occurs in disrotatory manner. In elecrocyclic reactions involving odd number of electron pairs, a thermal reaction occurs in disrotatory manner and a photochemical reaction occurs in conrotatory manner. To identify: Whether the cyclization and formation of a bicyclic product when (1Z,3Z,5Z)- 1,3,5-cyclononatriene is heated at 100ÂºC takes place in conrotatory or disrotatory manner. To state: The stereochemical relationship of the two hydrogens at the ring junction, cis or trans .

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 30.SE, Problem 21AP

Interpretation Introduction

Interpretation:

Whether the cyclization and formation of a bicyclic product when (1Z,3Z,5Z)- 1,3,5-cyclononatriene is heated at 100ÂºC takes place in conrotatory or disrotatory manner is to be identified. Further the stereochemical relationship of the two hydrogens at the ring junction, cis or trans is to be stated.

Concept introduction:

An electrocyclic reaction involves the cyclization of a conjugated acyclic system. These reactions are reversible and are highly stereospecific.

In elecrocyclic reactions involving even number of electron pairs, a thermal reaction occurs in conrotatory manner and a photochemical reaction occurs in disrotatory manner.

In elecrocyclic reactions involving odd number of electron pairs, a thermal reaction occurs in disrotatory manner and a photochemical reaction occurs in conrotatory manner.

To identify:

Whether the cyclization and formation of a bicyclic product when (1Z,3Z,5Z)- 1,3,5-cyclononatriene is heated at 100ÂºC takes place in conrotatory or disrotatory manner.

To state:

The stereochemical relationship of the two hydrogens at the ring junction, cis or trans.

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