Hydroboration-Oxidation of Alkynes Like alkenes, alkynes can also be subjected to Hydroboration-Oxidation to achieve an anti-Markovnikov addition of an OH group to the π bond. As in the case of acid-catalyzed hydration and oxymercuration, the intermediate here is an enol, which, this … Read more
Alkynes react with halogens in the same way as alkenes. The first addition of the halogen to the π bond produces a trans dihalide which is then converted into a tetrahalide: The trans dihalide can be prepared by … Read more
Alkynes have a general formula of CnH2n-2, and that is 4 H atoms less than alkanes, which have the general formula CnH2n+2. In between, we have the alkenes with the CnH2n formula. This means that alkynes can be reduced by … Read more
We have seen that in acid-catalyzed hydration of alkenes, an alcohol is formed according to the Markovnikov’s rule: In 1881, a Russian Chemist M. G. Kucherov discovered that alkynes also undergo acid-catalyzed hydration. The final product of this reaction, … Read more
We have seen that the electrophilic addition of hydrogen halides to alkenes produces alkyl halides according to Markovnikov’s rule: Alkynes undergo hydrohalogenation following a similar pattern. The addition of one equivalent of HX produces a vinyl halide, which … Read more
Alkynes are prepared by elimination reactions of alkyl dihalides: The reaction goes by an E2 mechanism and is similar to how alkenes are prepared. The difference here is that two halogen atoms are needed because the triple bond … Read more
Naming alkynes follows the same rules we discussed earlier for the IUPAC nomenclature rules for alkanes. This is the brief summary of the steps: Step 1. Identify the parent chain. Step 2. Identify the substituents. Step 3. Number the parent chain, giving … Read more
Alkynes Alkynes are unsaturated hydrocarbons that contain a carbon–carbon triple bond. Alkynes are unsaturated because they have fewer hydrogen atoms than the corresponding alkenes and therefore the general formula is CnH2n-2. Remember, the general formula for alkanes is CnH2n+2. That … Read more
