How could you convert each of the following compounds into butanoic acid? Write each step showin

How could you convert each of the following compounds into...

Key Concepts

Ozonolysis

Ozonolysis is a reaction that cleaves carbon–carbon double bonds using ozone. The resulting carbonyl fragments, typically aldehydes, can be further oxidized to form carboxylic acids. This method allows for selective disassembly of larger molecules to yield acids from alkenes.

Hydroboration-Oxidation

Hydroboration-oxidation is a reaction sequence used to convert alkenes into alcohols with anti-Markovnikov selectivity. The reaction adds a hydroxyl group to the less substituted carbon in a double bond, setting up an intermediate that can later be oxidized to a carboxylic acid.

Nucleophilic Substitution Reactions

Nucleophilic substitution reactions, especially via the SN2 mechanism, are often employed to replace a leaving group (like a halide) with a nucleophile. In synthesis, this strategy can be used to introduce a cyanide ion into an alkyl halide, forming a nitrile intermediate which, after hydrolysis, is converted into a carboxylic acid.

Functional Group Interconversion

This concept refers to the transformation of one type of functional group into another. It is the basis of many organic synthesis routes in which starting materials such as alcohols, alkenes, or alkyl halides are methodically converted into desired functional groups like carboxylic acids through carefully chosen reaction sequences.

Oxidation Reactions

Oxidation reactions are a key tool in organic synthesis, particularly useful for converting primary alcohols to carboxylic acids. Similarly, aldehydes generated either directly or via intermediate transformations can be further oxidized to yield carboxylic acids using reagents such as KMnO4 or Jones reagent.

Transcript

00:02 This is the answer to chapter 20, problem number 34 from the mcmurray organic chemistry textbook.

00:10 This problem is sort of the opposite of the problem before it, number 33.

00:16 In that, in number 33, we were asked to start from butanogac acid and convert that into five different things.

00:25 But here in number 34, we are asked to start from five different starting materials and convert each of them into butenoic acid.

00:35 Okay.

00:36 So looking at a, we have one butanol here, and we want to get to butenoic acid.

00:44 And so we can do this simply by using a strong oxidizing agent.

00:51 So chromium trioxide is a good one.

00:56 And then we would do an acidic work up there.

01:02 And that is going to get us to our butytoxic acid.

01:12 Okay.

01:13 And then for b and c, we're actually going to try to get to one butanol, and then again, use chromium trioxide to oxidize that to butanogac acid.

01:26 Okay.

01:26 So for b, as i said, we need to start by getting from bromobutane, one bromobutane to one butanol.

01:36 And so we can do that just by using sodium hydroxide.

01:41 And so that is going to get us to one butanol, and then again, just like in a, chromium trioxide, and some acid gets us to butanolic acid.

02:10 Okay, and then for c, we will start again by getting to one butanol, and to do that in c, we need to do an anti -marcognacobhydration.

02:25 So we need to add the elements of water in an anti -marcovnikov fashion.

02:32 And so the way to do that is to use a boron reagent.

02:36 So bh3 works.

02:39 And we always write that we include, you know, that we do that in thf.

02:44 And then we need to follow that with hydrogen peroxide and some base.

02:53 So h2o2.

02:55 And then just hydroxide ion is usually how that's written.