Question

Prepare 10 -hexyne from ethyne. Ethanol from ethyne. 3-hexanone from 3-hexyne

Answer 1

Question#75444 – Chemistry – Organic chemistry

Question:

Prepare 1-hexyne from ethyne. Ethanol from ethyne. 3-hexanone from 3-hexyne.

Answer:

1. To prepare 1-hexyne from ethylene we can use the alkylation of terminal alkyne.

The first stage is the reaction between ethyne and only one mole of sodium amide $\mathrm{NaNH_2}$. The ethynide ion (2 carbon atoms) that is produced on the first stage reacts with 1-bromobutane (4 carbon atoms) on the second stage producing 1-hexyne ($4+2=6$ carbon atoms).

2. To prepare ethanol from ethyne use hydration of alkyne and reduction reactions.

3. To prepare 3-hexanone from 3-hexyne use hydration of alkyne.

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