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The reaction below proceeds via an E2 elimination to provide 2 different alkenes. Using a Newman projection explain the produ

Draw the lowest energy conformer of each of the 5 compounds. NC

For each of the reactions below write the necessary reagent to carry out the transformation -OTBS -OTBS OPMB 0 OPMB Tro? ОН O

-OTBS гон OPMB OPMB Tro HO OMOM OH OTBS OH OPMB OPMB OMOM OMOM

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Answer #1

is -Ans is Here ere 120_xotation_take place to reduce an StericHindrance. nd Form_trans Isomex_are majd & gudo 11-relative_toE - ABS -cth Nad Tos or I Tromm TOLOMOM OPMB OCH fpara-methoxy_bemyl chloride) _PMB- Here_Selectivelly-deprotection of Llo-PM(OTK comom then FOTBS) can Alread Acidic condition B oman can be deprotect. OFBS) can be deprotectes = yor LOPMB- NA_Hexe (DTSummery : In E2 elimination reaction the eleminating Group is Antiperiplanar to leaving group. then Steric Approch is also important.

In Formaing and stable Conformation we have to known the Axial an Equetorial stablity of Cyclohexane conformation. Many steric hindrance are we have to recognise.

In Protection and Deprotection we only know the Selectivity of each of functional group and their reagent.

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