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Nitrile that gives pent-3-enal with DIBAL-H

The same question, asked 2 times: 16 May 2023 S1, 22 Apr 2025 S2. Every wording below, oldest first.

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  1. Question 1

    16 May 2023 S1

    83
    Identify the substrate 'A' in the following conversion. A→AlH(i-Bu)2, H3O+Pent-3-enalA \xrightarrow{\text{AlH(i-Bu)}_2,\,\text{H}_3\text{O}^+} \text{Pent-3-enal}

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  2. Question 2

    22 Apr 2025 S2

    73
    Identify the substrate ' AA ' in the following conversion. A→H3O+AlH(−B)2A\xrightarrow[H_{3}O^{+}]{AlH( - B)_{2}} Pent-3-enal

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