Question

Provide the reagents necessary to carry out the following conversion. A) B). C) Đ) E) 1. H2O/ H2SO4, 2. PCC/CH2Cl2 PCC/ CH2Cl2 1. BH3, 2. H2Oz/NaOH/H2O 1. 03, 2. Zn/acetic acid 1. BH3, 2. H2Oz/NaOH/H20, 3. PCC for the following reaction

Answer 1

(8) This is an oxidation reaction of alkyne into the aldehyde. This oxidation reaction takes place through the hydroboration oxidation reaction in which enol form of the product form and further converts into the keto form which is aldehyde here. Dots present the lone pair of electrons. So, the complete step wise reaction is given as below:-

» Donos BM -H @ H₂02/ Noor/120 - ~ A Tauto merizationg n y (Enol form) . (Final product) So, the complete reaction is given as below:- Z OBH3 ② H2O2(NaOH /H Then the correct option will be ② 1. BH3 , 2. H2O2/NaOH/H₂O