Essay type questions 1) Write down synthesis of imidazole...

Essay type questions 1) Write down synthesis of imidazole with any one example (chemical reaction). 2) Explain Paal-Knorr synthesis for furans, pyrroles and thiophenes with chemical reactions for each system.

Transcript

00:01 Hello everyone, in this question they have asked that explain polynor synthesis of furan, pyrol and thiophene so here first we are going to study about first one that is furan, in that in polynor synthesis we are going to take the starting material is 1 ,4 -dicarbonyl compound that is r -c -double bond o here it is r -c -double bond o here what happen in case of furan this is our dicarbonyl compound when it is react with h here what happen this oxygen is going to protonated so here oxygen have 1 part of electron it is going to be obstruct this proton so it produce oh that is r -c -double bond o then here it is r - here it is oh plus in next step what happens here we have proton so this is going to be obstructed by base so again here what happen this bond electrons are moves like this and here this pi electrons are going to be attack this carbon and here this bond electrons are moves towards the oxygen so here it produce r then here it is oxygen then here we have r - and here it is double bond and here we have oh in next step what happen here also we have proton it is going to be obstructed by base again this bond electrons are moves like this and here it is going to be eliminated as a water molecule that is minus h2o here it produce final product that is furan this is our final product so here it is r - and here we have r here the name of this compound is furan this is our polymer synthesis of furan and here second one here they have asked that pyrol here they have asked that pyrol so here also the starting material is 1 ,4 dicarbonyl compound that is r - c -double bond o when it is react with primary amine that is nh2r so here nitrogen electron here it is r - so it is going to be attacks here and this bond electrons are moves towards the oxygen so here it produce r -c -double bond o here it is r - and here it is o - and here we have r -nh2 so here nitrogen gets positive charge next step what happens here o - is going to be it is absorbed one proton from nitrogen so here what happens it produce r -c -double bond o and here it is r - here it is oh and here it is r -nh -r -double dash next…

Question

Essay type questions 1) Write down synthesis of imidazole with any one example (chemical reaction). 2) Explain Paal-Knorr synthesis for furans, pyrroles and thiophenes with chemical reactions for each system.

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