Question

Can you explain these 2 especially how you will know the leaving groups... please only answer if you know the correct answer. I will rate

3. Predict the major product for the following elimination reaction. Make sure that you draw any relevant Newman projections (looking down the C3-C4 bond) to support your answer. КО-Bu Hас" ён, t-BuOH 1 Draw a dibromide with molecular formula Ci4H12Br2 that would give exclusively the following alkene 4. under E2 reaction conditions. Use wedges and/or hashes to show the relative stereochemical relationships between groups, and support your answer with a relevant Newman projection. KOt-Bu t-BuOH Br

Answer 1

Answer of quesltm no- 3 kotou touOH E2-eliminatin CHB This compaund can be oriten in the followin uny St Back carban Ph Me Ме н ме ont Carbon Ph Ph Fischer projectfn Newmann projectron To undergo group (a) and H alusays must be in an antiperiplanar reloatimship (anedral angle 1g0' we can write the leavina aroup and H in ntiperiplanar pJittom by Yotatina back e or fremt tin the folowin und E2 eliminahn reactim the leaving an Кови -ph H .Ph Me Me '1g0 Anlipeviplanar Me 4 Ph are in 'trans' H 42t are in 'trans' H Atways leaving aroup and H relattmship during E2 elminatfm reacttTn are in antipeviplonar

Ansurer of auestion no-4 Or KotBu Ph tBuoH Ph Br E2-eliminalian C14 H12 Br2 Frm the dibromide atter elimination ot Her Uia E2 mechantsm the product is farmed the actual stereochemis- We have to deter mine o the veactant in which after E 2 eliminatim nelusivey the given alkene formed To det the Structure of fne dibromide we have to go in backward directtm - we Know if 'H' and leaving irup Br' are in an antiperiplanor velatfonship tnen ony E2 eliminatim Tcurs and in produc we seen thar two ph vina is in trans form So the structure af the reactant will be - Кови H ph d E2 Br ph ph EHor Br)< Antiperiplanar
H
So, the reactant will be Ph H Br H Br Ph Br ph H ph ph Newmann prUf९chim Rischer prejechim Frum Fischer prujectim ue can Convert i into ying Wedge prujecttam Ph Ph Ph H Ph er Ph br Ph PH

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