Question

Br tho Haz ZnCarDether DALO

please help me complete the transformations shown and if you van include the missing thing jn the equation whit both stero & regio chem

Answer 1

Reaction mechanism:

1) In HBr addition of alkene the bromide ion end up with more substituted carbon. This reaction follows Morkonikov rule.

2) Alkene react with Br2 molecule gives bromonium ion intermediate then solvent water molecule act as nucleophile and attack gives bromo hydrine. The bromonium ion ring opening follows SN2 mechanism so both Br an OH are opposite plane in the product.

3) Simmons smith reaction conditions convert the alkene into cyclopropane.

4) The alkyne converted into aldehyde by Hydroboration followed by peroxide oxidation.

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