University:
Shippensburg University of Pennsylvania
Course:
CHM 121 | Chemical Bonding
Academic year:

2022
Views:

8

Pages:

5
Author:

GrabCapacity

SE Reac" in monosubstituted benzene (Second subst in benzene oing) Directive influence of the groups. S- The position of new entering electrophile is mono substituted benzene depends group (6) already present position of Et meta may be in on the nature of ring The new ring alhd ge para or para 4 6. This group influence acts may imay of be Such groups ortho position directed by the direction also known as the group in election rich, called ring ectron The + electronic effect of group increase electron density" position at ortho-pala and make the ring than benzene. Likewise the cattracting para more IG may reactive be alectron decrease electron density at ortho- Bosition to the ring and make it directive iss vactive than benzene.. sor there are two integeones of the group either ortho para directing mator directing and their dir'n determined effects, termined by the inductive effect, Ressuance effect and electronic hyperconjugation effect. These geroups increase electron density at para positions so, Et will attack at ortho para positions since ring hove high electron density than bergene sol react faster than benzene gecoups. and also called activating The direction of call the electonic Affects in these compounds net poutie effect effects having opposite in will be overall case the two disection powerful effect dominate for ex- then more Electromeric and resonance effect don't oppose lach other and their total Zum of the effect also called tautomeric or conjugative effect. In Aneline, the key atom nitrogen more. •lectronegative than the neclens calibon atom so the exert some weak (-1) effect which is opposite to the tautomeric effect of -Ny group but the (+) tautomeric effect of NH group more powerful thant-I) effect so dominate the reaction and new entering electrophele goes to 0-20 position:. starbelised by net electron douceinture of already peresent Ny gerous. The Sintermediate I auld I having benzene carbon atobre attract e the charge are to the key alom of "highly stabilited and strongly from - in quoup and furthe - "O sp seibstitution Increase rate of The key atom of these groups. bonded with more itself become multiple electronegative stom than These groups attfuct electrons fecom 0-2 p position and make the do new porition which electron but rate of positions E+ es will vely charged. go the mela comparatively reaction will hove high be slower than brene because benzene rin deactivated by gecoups also these groups ring so I then called deactivated groups In meta directing groups all the effects become din (I), E, K never oppose same direction (I) each other Therefore, all the -directing gecoups are always react slower than benzene Sand and A Undoubtly