Q36 E - Organic Chemistry (Mcmurry)

Question

Question: How would you carry out the following conversions? More than one

step may be needed in some instances.

Step-by-Step Solution

Answer

Step 1: Treatment of alkynes with several reagents to convert them into other compounds

Alkynes can be transformed into alkenes by treating with hydrogen in the presence of Lindlar’s catalyst. They can be completely converted to alkanes if it is treated with H₂ in the presence of Pd catalyst.

Step 2: Conversion of alkynes to other compounds with different reagents

The conversion of alkynes to other compounds can be given as:

                           Conversion of alkynes to other compounds

Alkynes can be converted to alkenes by treating it with hydrogen in the presence of Lindlar’s catalyst. 

It can be converted to alkanes by treating with H₂  and Pd.

Alkynes can be converted to aldehydes by treating with ozone, followed by reduction with Zn and acetic acid. 

They can be converted to secondary halide by treating with HCl. 

Alkynes can be converted into aldehydes by treating with  BH₃ , THF, H₂O₂ and ^-OH. Alkynes can be converted to higher alkynes by treating with NaNH₂ in liquid ammonia and an alkyl halide.

Alkynes can be converted to ketones by hydration in the presence of H₂SO₄ and the reagent H_gSO₄  to form an enol that tautomerizes to a ketone.

Alkynes can be converted to an epoxide by treating with H₂ in the presence of Pd- BaSO₄ , followed by treating them with peracids like meta-chloroperoxybenzoic acid.