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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.
In chemistry, R usually represents the general symbol for an alkyl group, which is a group of atoms derived from an alkane by removing one hydrogen. It is commonly used in organic chemistry to represent any alkyl group in a molecule, where the specific alkyl group can vary.
In organic chemistry R means hydrocarbon Alkyl group, such as methly, ethyl, propyl, butyl, (straight or branched chains) or possibly rings such as cycloalkyl, In physical chemistry "R" means Gas constant .
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).
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What does the subscript r stand for in chemistry qr?
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.
What is R-CHO in chemistry?
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 what does the r stand for example rh cl2 - rcl hcl?
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.
Who was the winner of noble prize in chemistry in 2005?
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.
Why did Richard R. Schrock win The Nobel Prize in Chemistry in 2005?
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.
What has the author R A Witthaus written?
R. A. Witthaus has written: 'Essentials of chemistry' -- subject(s): Organic Chemistry, Chemistry, Pharmaceutical chemistry
What has the author William R Robinson written?
William R. Robinson has written: 'Chemistry' -- subject(s): Chemistry 'General chemistry with qualitative analysis' -- subject(s): Analytic Chemistry, Chemistry, Chemistry, Analytic, Qualitative
What has the author John R Amend written?
John R. Amend has written: 'General, organic, and biological chemistry' -- subject(s): Biochemistry, Chemistry, Chemistry, Organic, Organic Chemistry
What has the author R Nelson Smith written?
R. Nelson Smith has written: 'Chemistry; a quantitative approach' -- subject(s): Analytic Chemistry, Chemistry, Quantitative
What has the author R T Sanderson written?
R. T. Sanderson has written: 'Inorganic chemistry' -- subject(s): Inorganic Chemistry 'Teaching chemistry with models' 'Simple inorganic substances' -- subject(s): Inorganic Chemistry 'Fundamentals of modern chemistry' -- subject(s): Chemistry
What has the author Stephen R Byrn written?
Stephen R. Byrn has written: 'Solid state chemistry of drugs' -- subject(s): Pharmaceutical chemistry, Solid state chemistry
What has the author R J W Cremlyn written?
R. J. W. Cremlyn has written: 'A college organic chemistry' -- subject(s): Chemistry, Organic, Organic Chemistry
What does R-134A stand for?
In chemistry, this chemical compound, R-134A is the symbol for tetrafluoroethane. Tetrafluoroethane can be used as a solvent in organic chemistry.
What has the author Paul R Loconto written?
Paul R. Loconto has written: 'Trace environmental quantitative analysis' -- subject(s): Analytic Chemistry, Chemistry, Analytic, Environmental chemistry, Quantitative, Trace analysis
What has the author R A Day written?
R. A. Day has written: 'Quantitative analysis' -- subject(s): Analytic Chemistry, Analytical Chemistry, Laboratory manuals, Quantitative
What has the author S R Logan written?
S. R. Logan has written: 'Physical chemistry for the biomedical sciences' -- subject(s): Chemistry, Physical and theoretical, Physical and theoretical Chemistry 'Fundamentos de Cinetica Quimica'
What is R O R in chemistry?
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.
