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Q8.5(v):
Draw structures of the following derivatives. (v) The ethylene ketal of hexan-3-one

Solution :

Step 1: Analyzing the Parent Carbonyl Compound

The parent molecule is hexan-3-one. The structural formula for hexan-3-one is determined by its IUPAC name:

  • "Hexan" indicates a chain of 6 carbon atoms.
  • "-3-one" indicates a ketone functional group ($C=O$) located at the third carbon atom.

The condensed structural formula is: $CH_3-CH_2-C(=O)-CH_2-CH_2-CH_3$. [Per IUPAC nomenclature conventions for ketones].

Step 2: Defining the Ketalization Reaction

The formation of an ethylene ketal occurs through the reaction of a ketone with ethylene glycol ($HO-CH_2-CH_2-OH$) in the presence of an acid catalyst (e.g., $p$-toluenesulfonic acid). This is a nucleophilic addition-elimination reaction. [Per the mechanism of cyclic acetal/ketal formation].

The ketone carbonyl oxygen is replaced by the two oxygen atoms of the ethylene glycol, forming a five-membered dioxolane ring fused to the original carbonyl carbon.

Step 3: Constructing the Chemical Structure

The carbonyl carbon (C3 of the hexane chain) becomes the spiro-center of the dioxolane ring. The remaining alkyl groups attached to the carbonyl carbon ($CH_3CH_2-$ and $-CH_2CH_2CH_3$) remain as substituents on this central carbon.

$CH_3CH_2-$ $-CH_2CH_2CH_3$ O O

Step 4: Final IUPAC Interpretation

The structure represents 2-ethyl-2-propyl-1,3-dioxolane. This derivative is the cyclic ketal formed by protecting the ketone functionality of hexan-3-one.

Component Structural Contribution
Central Carbon (C3) Tetrahedral center connecting the ethyl group, propyl group, and the two oxygens.
Ring Atoms Two oxygens and two carbons from ethylene glycol forming a 1,3-dioxolane ring.

Final Solution: The ethylene ketal of hexan-3-one is 2-ethyl-2-propyl-1,3-dioxolane, featuring a five-membered heterocyclic ring containing two oxygen atoms bonded to the original C3 of the hexane chain.


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