in this slide the whole concept of dienes the topic of organic chemistry is described briefly especially from the course of B.sc. this would be helpful for chemistry students it includes method of preparation of dienes addition of halogen , halogen acids. etc. effect of temperature on reaction

1. DIENES

2. Classification :-

3. Central Carbon atom is sp Hybridised
Terminal carbon atoms are sp2 Hybridised

4. Structure of 1,3-BUTADIENE :-

5. ORBITAL STRUCTRE :-

6. METHODS OF FORMATION OF DIENES :-

7. CHEMICAL REACTIONS OF DIENES
In Diene the chemical reagent is consumed in the twice amount required for
alkene.

8. Electrophilic addition rxn’s 1,2 & 1,4 Addition :-

9. Mechanism of 1,2 & 1,4 – addition to conjugated diene :-

10. ADDITION OF HALOGEN ACIDS :-

11. MECHANISM OF THE REACTION :-

12. EFFECT OF TEMPERATURE ON 1,2 & 1,4 ADDITION TO CONJUGATED DIENES :-

13. EXPLANATION OF THE EFFECT OF TEMPERATURE ON 1,2 & 1,4 ADDITION :-

14. AT LOWER TEMPERATURE AND HIGHER TEMPERATURE :-

15. FREE RADICAL ADDITION RXN’S :-

16. MECHANIM OF THE REACTION :-

17. DIELS-ALDER REACTION :- (4+2) CYCLOADDITION

18. DIELS-ALDER REACTION TAKES PLACE VERY READILY WHEN SUBSTITUTED ALKENES
CONTAINING ELECTRON WITHDRAWING GROUPS ARE USED AS DIENOPHILE
FOR example :- ACROLEIN and MALEIC ANHYDRIDE

19. FACTORS WHICH FAVOUR THE REACTION :-