Additions to the Olefinic C=C Double Bond

摘要: The C=C double bond can be described with two different models. According to the less frequently used model, bonds consist of bent C–C single bonds. second model is describe bonding in olefins, according which, a consists σ and π bond. higher stability σ- comparison π-C–C due difference overlap between atomic orbitals that form these Regardless which utilized, it clear upon exposure suitable reagent, relatively weak an olefin given up stable conserved instead. In addition, reactions olefinic bonds, new sp 3 -hybridized C atoms are produced. Each them stereo-genic center (stereo-center) obviously one if possesses four substituents. Stereo-chemical aspects important part chemistry addition All one-step additions mechanistically required take place cis selectively. Simmons–Smith reagent olefins leads step chlorine-free cyclopropanes. Hydroboration has become very organic chemistry, mainly because secondary reaction, almost always carried out after it. There no known molecular hydrogen (hydrogenation), possible only noble metal catalysts.