This question is about the structure of products X and Y. According to me, the answer should be only A (as OTs will substitute on benzylic carbon).
But in the answer key, they have given B and D.
Please help.
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1$\begingroup$ I'd suggest you that, in your future questions and answers, not to abbreviate word for the benefit of most of the readers. Thank you. $\endgroup$– Mathew MahindaratneMay 20, 2018 at 6:22
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1$\begingroup$ Done @MathewMahindaratne. Will keep this in mind for future questions... $\endgroup$– Man of SteelMay 20, 2018 at 6:24
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4$\begingroup$ The picture is blurry. Please upload a better quality one/ consider sketching through chemsketch. $\endgroup$– ArcherMay 20, 2018 at 6:36
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1 Answer
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There are two replaceable $\ce{H}$s in the starting material, but only 1 equiv of $\ce{TsCl}$ is given. Thus, primary $\ce{-OH}$ will win the battle due to steric reasons, and therefore, B represent the intermediate product X. The second reaction is firstly acid-base reaction between secondary $\ce{-OH}$ and $\ce{H-}$, and then, nucleophilic substitution ($\mathrm{S_N}$2) reaction to replace $\ce{-OTs}$ group by $\ce{H-}$. That leaves D as the product Y, after acid workup.
answered May 20, 2018 at 6:45
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$\begingroup$ So u mean that since the benzylic carbon is sterically hindered, its -OH won't be substituted?? $\endgroup$ May 20, 2018 at 6:48
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1$\begingroup$ The faster reaction is acid-base reaction. Once, acetic $\ce{H}$ removed from $\ce{-OH}$, it is basically not removable. $\endgroup$ May 20, 2018 at 6:56