Reactions Mechanism

SE Reac in Other Aromatic Rings (Napthalene & Eyridine). SE Reach in Napthalene Ring Napthalure having than of electrons 10 T electrons more of benzene so it well be more reactive than benzene kousards SE Reach. Since Et attack faster at more electron density. The SE reactions takes place eithere a ost & position it will be depend upon the comparibile stability of ct Entermediate I sesonating structure sesonating In napthalene subs takes place because the its charge intermediate et over four resonating at x-position con delcsalived strictures while in & suber there are delocalised strictures 2nd ring only twe such The delocalisation of become common is bath the cases se second ring delocalication not involve in both the cases. SE Reach in Pyridine Deactivation is pyridine Rieng SE reactions in fyridine ring than Berzine are difficult due to the electron attracting more electrismigatie N-atom invelis I in rielg formation hue to slection attracting nature pyeridine has and y positions attracting the charge at It is amblagons to metro benzene so, & and y position deactivated and possible SE can only at 8-position under régorous condition so like ultrosergene pyridund become deactivated The above explanation also peroved by comparitie stability of during substituthors Extermediate ne low The SE reaction in pyarudine ring at p positie also favoured by charge distribution - complex intermediate structures of intermediatz delvealised rahile Ju all the resonating the positive over less electronegative carbon atoms. during nand y seeks the intermediate I and II. unstable because ove are highly unstable are of the resumating trulture having recharge en atom which at more dechu negative Natom dwhich is divalent and incomplete octet so highly sensbas and very difficult to form so, pyridine is deactivated ring for se cactions like that of nitro bellzene Ipso Substitution In benzene ring, all the carbon atoms and all the six H atoms are identical tut when a group other than 1 atom present in the ring. Et desigerated ibso carbon atom ded further attack of Et at this as iso attack and subs and subs of Carbon known of this group during the reaction is called ipes suban The lubje of ees group depend on stability off formation on and ease of formation of the Cation mare the stabilisatios ipss group of charge ky cation more Nadily radily it it form form and and mort substitution easy will be lo The best example of the rubin is protodealays of alkye benzene thit reaction is the The ipso subs of various alkyl group. decreasing order will be same decreasing stability of c the Some reactions involving SE Mechanism Diazo coupling Reaction Arocoupling occurs when benzene diazo -nhem chloride reacts with phenolis amira bergene wing compounds. p-hydroxy azo benzene (Dye) Since, coupling react at density. is 56 reaction the Et the position of high election Now, w group of phenols and my group of arare highly de donating groups and facilitate for electophilic attack and as a powerful nucleophilh busferenciaseg takes place electron the ring teelf behave coupling at -poslen bat furbly occupled than tails place C) Gratterman kach seeaction - es the farmylation of activated areumatic Isan by Iseac carbon mono-onitle I disolved in Hel in pressence of tilagin courier. The fornyl E generated. The reac best takes place in the reing containin activated arthe para directing I groups. I the best are The foxnzylation takes place at Athe pard prective in which product laminate It is also the farmyluhan of asemectic sing when treated to do mitthal jevenantee (D.M.F) Com Substituted formamid site phenyl methyl jornamilk g-bre delenith The chalee presence of perphares ong-do chronicle inintum & geneated which is sesponsible for SE Jane" fellowed by reach to actified sandier sestrite sal like ather SE serve it the better taker place to the crematic sing containing activating-OM, OR, NH, NHR INR groups