This mechanism does not involve the formation of a carbocation intermediate. Chemical reactions can be made into reactions that give the Anti Markovnikov product by adding a peroxide such as HOOH to the reaction mixture. Stereochemistry is a branch of chemistry that involves the study of spatial arrangements of organic molecules and their manipulation.
It involves the study of stereoisomers. Stereoisomers are molecules having the same molecular formula and the atomic arrangement, but different spatial arrangements. The two main groups of stereoisomers are:. Geometric isomers are also known as cis-trans isomers. These isomers always occur in pairs.
The two isomers are the cis-isomer and the trans-isomer. These isomers occur in molecules having double bonds. The attachment of a functional group to the vinylic carbon atom is the difference between these two isomers. Vinylic carbon is the carbon atom having a double bond with another carbon atom. Figure 2: Geometric Isomerism. Every rule has its importance in different chemical reactions.
Stereochemistry is the field of chemistry that studies the prearrangement and manipulation of the organic molecules of a biochemical reaction. It mainly focuses on the spatial arrangement of organic molecules. Its main specifications are to arrange the molecules in an order such as in geometric isomers, etc. This branch mainly involves in the proper arrangement of stereoisomers of a reaction. It prefers more than one orientation at a time during the procedure and reaction. It deals with all types of addition reactions hydrogenation, etc.
It is the atomic arrangement of the reacting molecules. Stereochemistry focuses on molecules of the reactants. The arrangement of stereoisomers occurs in stereochemistry. The concept of chirality of the organic compounds is also mainly described by this branch of chemistry. Authored by : Gamini Gunawardena.
Project : Chemistry LibreTexts. Skip to main content. Search for:. Regiochemistry, stereochemistry eg. Exercise Predict the product of the following reaction:. Enantioselective — one enantiomer forms over other isomers; a chiral molecule forms from an achiral molecule, degree of selectivity is measured from enantiomeric excess. Diastereoselective — one diastereomer forms over the other isomer; one or more chiral centers forms from either an achiral center or a preexisting chiral center, the degree of selectivity can be measured from diastereomeric excess.
Stereoconvergence — opposite of the stereoselectivity in which two different stereoisomers form a single stereoisomer. The key difference between regioselectivity and stereoselectivity is that regioselectivity refers to the formation of one positional isomer over another, whereas stereoselectivity refers to the formation of one stereoisomer over another.
Therefore, regioselectivity forms a positional or a constitutional isomer while stereoselectivity forms a stereoisomer. However, both pathways form the other isomer as a minor product along with the preferred isomer, which forms as the major product. Besides, the study of regioselectivity comes under regiochemistry, whereas the study of stereoselectivity comes under stereochemistry.
The key difference between Regioselectivity and Stereoselectivity is that regioselectivity refers to the formation of one positional isomer over another, whereas stereoselectivity refers to the formation of one stereoisomer over another.
0コメント