Question

11.24 The following equation shows the reaction of trans-2,3-diphenyloxirane with hydrogen chloride in benzene to form 2-chloro-1,2-diphenylethanol. CH, CH + HCI - CH,CH-CHCH, HÓ CI trans-2,3-Diphenyloxirane 2-Chloro-1,2-diphenylethanol (a) How many stereoisomers are possible for 2-chloro-1,2-diphenylethanol? (b) Given that opening of the epoxide ring in this reaction is stereoselective, predict · which of the possible stereoisomers of 2-chloro-1,2-diphenylethanol is/are formed in the reaction.
when the Cl attacks the epoxide, doesnt it invert the stereochemistry of it? i am a bit confused

Answer 1

a) the no of stereo isomers are 4 because the stereo centers are 2 and they are showing the 2² = 4 isomers

b) the ring opening epoxide will gives the following isomers and they are as follows

in GHE Goto C-CaH + H - 200 loot stereo 9 somex H н. CoHS TH - Currunette C6H5 414H но н