The mechanism for an enamine based conversion has to be proposed. Concept Introduction: Enamine reaction: An enamine, the nitrogen is s p 2 hybridisation, so there is overlap of the 2 p orbital of nitrogen atom with the 2 p orbitals of the carbon-carbon double bond. This overlap allows electrons delocalization and thus stabilization of the enamine.

Question

a. The structure of the bicarbonate (hydrogen carbonate) ion, HCO3-, HCO3 " is best described as a hybrid of several contributing resonance forms, two of which are shown here. HO :0: HO + :Ö: Bicarbonate is crucial for the control of body pH (for example, blood pH 7.4). A more self-indulgent use is in baking soda, where it serves as a source of CO2 CO2 gas, which gives bread and pastry their fluffy constituency. (i) Draw at least one additional resonance form. = (ii) Using curved "electron-pushing" arrows, show how these Lewis structures may be interconverted by movement of electron pairs. (iii) Determine which form or forms will be the major contributor(s) to the real structure of bicarbonate, explaining your answer on the basis of the criteria in Section 1-5.

Answer 1

Question

Chapter 19, Problem 19.41P

Interpretation Introduction

Interpretation:

The mechanism for an enamine based conversion has to be proposed.

Concept Introduction:

Enamine reaction:

An enamine, the nitrogen is sp2 hybridisation, so there is overlap of the 2p orbital of nitrogen atom with the 2p orbitals of the carbon-carbon double bond. This overlap allows electrons delocalization and thus stabilization of the enamine.

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