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

2022
Views:

21

Pages:

5
Author:

GrabCapacity

Op Ratio In benzene, the two cattes positions and one poma posetion perusent. In mestiere of op products quantities Calculated mathematically, there well be 67:33 ratio and p products But it is found that this naspecte as theoretical but practically this ratio found large variati on En la To explain op ratio the three glven of products. which The affect factors the are main quantity effect, inductive Effect and temperature- steveic effect: It is one of the important already alse the effect pecodiced by the present in beerzene entering of entering size of group ib benzene decrease the increase and Et 4s the already percesent formation of product As the value the amount of o-quantity value more than 1 beroduct more It means langen drerease decrease. Jamente are of then Jamount than the p- perodect group already fresent, the position Evercrowd and formation of o. product produ decrease consequently walile of o/p decrease from numeral udlue1 for ex is in following geradually decrease as alkyl group increase sompounds, thre comp the the op The store effect also observed on entering Et. for ex if tert-butyl benzene is chealluated some amount of 0- product form more amount of p-product. becominated and with Now, if the obecomo product negligible of p-product st can also be explained significant. the more bulky size of bromene than chescene which incrlax steric effect so op decrease In p-eymene the substitection takes free at the position to the methyl gap o-positive of iso perspyl group.. the isopropyl group has TI ffect than takes place at than However, more strong so, subs - group so, -position to Isopropyl grad. dut it is miner pusduct and can be understand the gerous which weky size of leopropyl bulky produce! storie ffect and Evercrowd I's estho position so, o-product to methyl group become mafer product. Inductive effect Off ratio not only affected by steric effect of group already peresent inductive effect effect of the group the inductive effect of the quang already peresent affect off ratio and mainly to the o-position just adjacent while very little affected since it is 4th carbon atom. The cherried in halobenzenes. Halogen peroduce -I effect and the intensity decrease fecom due to the strongest -I effect o bosition highly affected by the charge. so tvely charge electrophete slowly attack at thely charge o position and ist o complex formation from F to I So, the artho position the I nature decrease. less and less affected by the charge is the same order. product quantity so artho increase ferom fto I Op ratio Enchecise Therefore If sterie effect is the only facter then the size increase from F to I' and rate of 0.product formation should decrease But the result practically reverse The explaination given by Sanding that inductive effect also - an important factor in off ratio. 3) Temperature The blupical conditions. also of the reactions play the important role and affect off ratio for example, Bromination of Acetanilide below room temp towards of The ortho subs become negligible, p-bromo acetanilide is the same bromination with temp. management main and product. carried out the O-Bromo acetaling form in significant quantity.