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4.2. Suggest reasonable mechanisms for each of the following reactions. The starting materials are racemic, unless otherwise
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Answer #1

Multiple sub-parts, as per guideline only first 4 will be answered (4a-4d) :

a.' P' attacks with its lone pair, with expulsion of of chloride ion.Cl- captures methyl group from methoxy , leading to product.

b. Both enantiomers gives different products, via non-classical cabocation.

42 (22) (Me 0 on о си, a yopt-OCH3 – cuce and when (H₂COP Ch Ph Clia Chph COBS 46 (Non- 35 03 (C) Phycoold HC=CCH CH CH - CC

c. Proton from acid attacks to triple bond,Cl assists in reaction : leading to product.

d. Compounds gives different product based on position of leaving group.

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