Rearrangement reactions involve the reorganization of atoms within a molecule, leading to a structural isomer. These are crucial in organic synthesis. Some common rearrangements include:
Knowing the specific function of a reagent is crucial for solving "Reagent Guessing" questions. A: No
| Reagent | Common Name | Application/Function | | :--- | :--- | :--- | | $LiAlH_4$ | Lithium Aluminium Hydride | Strong reducing agent. Reduces carbonyls, esters, acids, and amides to alcohols/amines. Does not reduce alkenes. | | $NaBH_4$ | Sodium Borohydride | Mild reducing agent. Reduces aldehydes and ketones to alcohols. Does not reduce esters or acids. | | $KMnO_4$ (Alkaline) | Potassium Permanganate | Oxidizing agent. Converts alkenes to diols (syn addition) or cleaves double bonds to carbonyls/acids. | | $O_3$ | Ozone | Ozonolysis. Cleaves alkenes to form aldehydes or ketones (reductive workup with $Zn$). | | $PCC$ | Pyridinium Chlorochromate | Mild oxidizing agent. Converts primary alcohols to aldehydes (stops at aldehyde, does not over-oxidize to acid). | | $H_2/Pd-C$ | Hydrogenation | Reducing agent. Reduces alkenes and alkynes to alkanes. | | $Lindlar's Catalyst$ | $Pd/CaCO_3 + PbO$ | Selective reduction. Converts Alkynes to Cis-Alkenes. | | $NaNH_2$ (liq. $NH_3$) | Sodium in Ammonia | Reduction. Converts Alkynes to Trans-Alkenes (Birch reduction context). Also used for dehydrohalogenation. | | $NBS$ | N-Bromosuccinimide | Source of Bromine radicals. Used for allylic/benzylic bromination. | Rule: The group that migrates is usually the
A: No. The book is copyrighted. However, some libraries offer free digital borrowing. Avoid pirated “23l repack” versions. A: No
Organic chemistry is fundamentally about reactions. These are processes where one or more substances (the reactants) are converted to new substances (the products). There are several types of reactions, including: