A mechanism for the conversion of the epoxide (obtained by treating a trans alkene with peracids) into cis alkene by treatment with triphenylphosphine is to be proposed. Concept introduction: Attack of the nucleophile, triphenyl phosphine, on the epoxide obtained from a trans alkene, opens up the ring. Free rotation is possible in C–C bonds. The rotation of the C–C single bond and subsequent removal of triphenylphospheneoxide will yield the cis product. To propose: A mechanism for the conversion of the epoxide (obtained by treating a trans alkene with peracids) into cis alkene by treatment with triphenylphosphine.

Question

Consider the following Figure 2 and two atoms that are initially an infinite distance apart, x =00, at which point the potential energy of the system is U = 0. If they are brought together to x = x, the potential energy is related to the total force P by dU dx = P Given this, qualitatively sketch the variation of U with x. What happens at x=x? What is the significance of x = x, in terms of the potential energy? 0 P, Force 19 Attraction Total Repulsion x, Distance Figure 2. Variation with distance of the attractive, repulsive, and total forces between atoms. The slope dP/dx at the equilibrium spacing xe is proportional to the elastic modulus E; the stress σb, corresponding to the peak in total force, is the theoretical cohesive strength.

Answer 1

Question

Chapter 19.SE, Problem 48MP

Interpretation Introduction

Interpretation:

A mechanism for the conversion of the epoxide (obtained by treating a trans alkene with peracids) into cis alkene by treatment with triphenylphosphine is to be proposed.

Concept introduction:

Attack of the nucleophile, triphenyl phosphine, on the epoxide obtained from a trans alkene, opens up the ring. Free rotation is possible in C–C bonds. The rotation of the C–C single bond and subsequent removal of triphenylphospheneoxide will yield the cis product.

To propose:

A mechanism for the conversion of the epoxide (obtained by treating a trans alkene with peracids) into cis alkene by treatment with triphenylphosphine.

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