The structure of a carbocation intermediate formed in the addition reaction of HBr to two different alkenes is given. The structures of both alkenes are to be given. Concept introduction: In electrophilic addition reactions the first step involves the attack of the π electrons of the double bond on the positively polarized hydrogen atom of the hydrogen halide to give a carbocation as the product with the elimination of a halide ion. In the second step the carbocation reacts with the halide ion to give the product. To draw: The structures of two alkenes that yield the carbocation intermediate given in an addition reaction with HBr.

Question

20. The Brusselator. This hypothetical system was first proposed by a group work- ing in Brussels [see Prigogine and Lefever (1968)] in connection with spatially nonuniform chemical patterns. Because certain steps involve trimolecular reac tions, it is not a model of any real chemical system but rather a prototype that has been studied extensively. The reaction steps are A-X. B+X-Y+D. 2X+ Y-3X, X-E. 305 It is assumed that concentrations of A, B, D, and E are kept artificially con stant so that only X and Y vary with time. (a) Show that if all rate constants are chosen appropriately, the equations de scribing a Brusselator are: dt A-(B+ 1)x + x²y, dy =Bx-x²y. di

Answer 1

Question

Chapter 6.SE, Problem 15VC

Interpretation Introduction

Interpretation:

The structure of a carbocation intermediate formed in the addition reaction of HBr to two different alkenes is given. The structures of both alkenes are to be given.

Concept introduction:

In electrophilic addition reactions the first step involves the attack of the π electrons of the double bond on the positively polarized hydrogen atom of the hydrogen halide to give a carbocation as the product with the elimination of a halide ion. In the second step the carbocation reacts with the halide ion to give the product.

To draw:

The structures of two alkenes that yield the carbocation intermediate given in an addition reaction with HBr.

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20. The Brusselator. This hypothetical system was first proposed by a group work- ing in Brussels [see Prigogine and Lefever (1968)] in connection with spatially nonuniform chemical patterns. Because certain steps involve trimolecular reac tions, it is not a model of any real chemical system but rather a prototype that has been studied extensively. The reaction steps are A-X. B+X-Y+D. 2X+ Y-3X, X-E. 305 It is assumed that concentrations of A, B, D, and E are kept artificially con stant so that only X and Y vary with time. (a) Show that if all rate constants are chosen appropriately, the equations de scribing a Brusselator are: dt A-(B+ 1)x + x²y, dy =Bx-x²y. di

Problem 3. Provide a mechanism for the following transformation: H₂SO A Me. Me Me Me Me

You are trying to decide if there is a single reagent you can add that will make the following synthesis possible without any other major side products: xi 1. ☑ 2. H₂O хе i Draw the missing reagent X you think will make this synthesis work in the drawing area below. If there is no reagent that will make your desired product in good yield or without complications, just check the box under the drawing area and leave it blank. Click and drag to start drawing a structure. There is no reagent that will make this synthesis work without complications. : ☐ S ☐