Question

Please answer all 3 questions

Status What is/are the major products of this reaction? HB ta (R)-3-bromo-2,3-dimethylpentane only (9)-3-bromo-2,3-dimethylpentane only a 50:50 mixture of (R) and (5) 3-bromo-2,3-dimethylpentane a 70:30 mixture of (R) and 53-bromo-2,3-dimethylpentane QUESTION 8 Which of the following is the most stable conformation of cis-1-isopropyl-3-methylcyclohexane? qua CHICH "CHICHI 2 QUESTION 9 What is the best reagent to complete this synthesis? CN OH 1. ??? 2. NaCN PBr3 (CH3)3 Sici SOCI TSCI Submit to save and submit. Click Save All Answers to see all answers

Answer 1

Н. H Br A) Bn0 (stable 3. Cabbecaution) + Bro (S)-3-bromo - 293 - (R)-3-bhomo -2,3 dimethylippen pentane dimethylpentane. Since intermediate carbocation is planan goz hybradized , so it is shape. Hence Bro can attack the carbocation either from above on below the plane and as a nesult of this get 50:50 mintune of (R) and (5) - 3-bromo-2,3. -dimethylpentane. an we CH(CH3)2 8. on Calle CH₂ The most stable conformation of Cis-1 isopropyl-3methylcycle- hexane is, -CH(CH3)2 city CS Scanned with CamScanner

en 9. OH 1. ? 2. Nach cell 3 TRO C3 H KON 0003 Taksit 1. Tsel له $ •CH3 CH3 $ CN Osno -CH3 2NCN sa² SN2 is an Here in the above reaction only the second step beaction where inversion takes place. Hence get the desined beagent step 1 only product inversion occurs and coe Hence the best is Tsel CS Scanned with CamScanner