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This is the answer to chapter 20, problem number 12 from the mcmurray organic chemistry textbook.
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This problem asks us, how might you carry out the following transformation? and so we are basically, we're just adding a carbon.
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And it says more than one step is needed.
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And so what we're going to do is get this alcohol, to the corresponding carboxylic acid, and that will add a carbon, and then we will reduce that carboxylic acid to get back to the alcohol.
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So the first thing that we're gonna do here is gonna be to treat this alcohol with pbr3.
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And so that is going to take us from the alcohol to the alkali.
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So we have the bromine here now.
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And then to get from here to the carboxylic acid, this time i'm going to use a grignard, so magnesium, metal, and ether.
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And then we'll follow that with carbon dioxide and an acid workup.
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And so that is going to get us to our carboxylic acid here...