In organic chemistry and biochemistry, the symbol R denotes a side chain. (The symbol in fact stands for radical.) This is useful when you wish to write a single formula to denote a number of different compounds with a certain structure in common.
Example
All the amino acids that are encoded by DNA have this component: -CH(NH2).CO2H
A convenient way to write the formula for all these amino acids is:
R-CH(NH2).CO2H
where
R = hydrogen (H-) in the amino acid glycine
R = a methyl group (CH3-) in alanine
and so on.
For chemists, the R / S system is the most important nomenclature system for denoting enantiomers, which does not involve a reference molecule such as glyceraldehyde. It labels each chiral center R or S according to a system by which its substituents are each assigned a priority, according to the Cahn-Ingold-Prelog priority rules (CIP), based on atomic number. If the center is oriented so that the lowest-priority of the four is pointed away from a viewer, the viewer will then see two possibilities: If the priority of the remaining three substituents decreases in clockwise direction, it is labeled R (for Rectus, Latin for right), if it decreases in counterclockwise direction, it is S (for Sinister, Latin for left).
The subscript r in chemistry typically refers to a rate constant in a chemical reaction. It represents the rate at which a reaction occurs under specific conditions.
R-CHO represents an aldehyde functional group in organic chemistry, where R is a generic symbol indicating the rest of the molecule. Aldehydes contain a carbon atom double-bonded to oxygen and single-bonded to hydrogen, and they are known for their distinctive carbonyl group.
In organic chemistry, the "R" group stands for any alkyl or aryl group. It is used as a placeholder to represent a wide variety of possible substituents in a molecule.
The Nobel Prize in Chemistry in 2005 was awarded jointly to Yves Chauvin, Robert H. Grubbs, and Richard R. Schrock for their work on the development of the metathesis method in organic synthesis.
Richard R. Schrock won the Nobel Prize in Chemistry in 2005 for his work on the development of the metathesis method in organic synthesis. This method allows for the efficient and environmentally friendly production of complex molecules, which has had a significant impact on the fields of pharmaceuticals, materials science, and biotechnology.
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In chemistry, this chemical compound, R-134A is the symbol for tetrafluoroethane. Tetrafluoroethane can be used as a solvent in organic chemistry.
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R O R stands for an ether functional group in chemistry. It consists of an oxygen atom bonded to two alkyl or aryl groups. Ethers are commonly used as solvents in various chemical reactions.