Question
Complete the following sequence of reactions and write structures for A, B, C.
✓
Answer
$\underset{\text { Alkyl magnesium halide }}{ R - Mg - X }+\underset{\text { dry ice }}{ C }= O \stackrel{\text { dry ether }}{\longrightarrow} R -\underset{\text { complex }}{ COOMgX } \underset{\text { dil } \cdot HCl }{\stackrel{ HOH }{\longrightarrow}} \underset{\text { Carboxylic acid (A) }}{ COOH }+ Mg ( X ) O H$
$\underset{\text { Carboxylic acid }}{ R - COOH }+ PCl _5 \stackrel{\Delta}{\rightarrow} \underset{\text { Acyl chloride }( B )}{ R - COCl + POCl _3+ HCl}$
$\underset{\text { Carboxylic acid }}{ R - COOH }+ PCl _5 \stackrel{\Delta}{\rightarrow} \underset{\text { Acyl chloride }( B )}{ R - COCl + POCl _3+ HCl}$
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