[permalink] [id link]
An alkyl group, generally abbreviated with the symbol R, is a functional group or side-chain that, like an alkane, consists solely of single-bonded carbon and hydrogen atoms, for example a methyl or ethyl group.
from
Wikipedia
Some Related Sentences
alkyl and group
These include hydride shift reactions such as the Wagner-Meerwein rearrangement, where a hydrogen, alkyl or aryl group migrates from one carbon to a neighboring carbon.
Ethers () are a class of organic compounds that contain an ether group — an oxygen atom connected to two alkyl or aryl groups — of general formula R – O – R '.
R and R ' denote any alkyl or aryl group
For example, an ester ( RCOOR ') has an ester functional group ( COOR ) and is composed of an alkoxy moiety (- OR ') and an acyl moiety ( RCO -), or, equivalently, it may be divided into carboxylate ( RCOO -) and alkyl (- R ') moieties.
For example, silica is functionalized with an alkyl silicone, wherein the alkyl contains an amine functional group.
• The molecular length should be at least 1. 3 nm, consistent with the presence of long alkyl group on many room-temperature liquid crystals.
Methyl group is an alkyl derived from methane, containing one carbon atom bonded to three hydrogen atoms — CH < sub > 3 </ sub >.
R < sup > 1 </ sup >, R < sup > 2 </ sup > and R < sup > 3 </ sup > are alkyl group s ( approx.
This functional group, with the structure R-CHO, consists of a carbonyl center ( a carbon double bonded to oxygen ) bonded to hydrogen and an R group, which is any generic alkyl or side chain.
The hydrogen atoms in the ammonium ion can be substituted with an alkyl group or some other organic group to form a substituted ammonium ion ( IUPAC nomenclature ": aminium ion ).
The haloalkanes ( also known as halogenoalkanes or alkyl halides ) are a group of chemical compounds derived from alkanes containing one or more halogens.
In primary ( 1 °) haloalkanes, the carbon that carries the halogen atom is only attached to one other alkyl group.
As can be seen, the OH is now attached to the alkyl group, creating an alcohol.
Therefore, it has the formula RCO -, where R represents an alkyl group that is attached to the CO group with a single bond.
* alkylation, the addition of an alkyl group, e. g. methyl, ethyl
One common stationary phase is a silica which has been surface-modified with RMe < sub > 2 </ sub > SiCl, where R is a straight chain alkyl group such as C < sub > 18 </ sub > H < sub > 37 </ sub > or C < sub > 8 </ sub > H < sub > 17 </ sub >.
' Poppers ' is the street name for a group of simple alkyl nitrites ( the most well-known being amyl nitrite ), which are clear, yellow volatile liquids which are inhaled for their intoxicating effects.
This reaction is exploited in biological systems as a means of transferring an alkyl group.
alkyl and generally
S < sub > N </ sub > 2 reactions are generally favored in primary alkyl halides or secondary alkyl halides with an aprotic solvent.
Most carboxylic acids are suitable for the reaction, but the alcohol should generally be a primary or secondary alkyl.
In the laboratory, acyl chlorides are generally prepared in the same manner as alkyl chlorides, by replacing the corresponding hydroxy substituents with chlorides.
Acid chlorides of aromatic acids are generally less reactive those of alkyl acids and thus somewhat more rigorous conditions are required for reaction.
AES found in consumer products generally are linear alcohols, which could be mixtures of entirely linear alkyl chains or of both linear and mono-branched alkyl chains.
Organic polysulfides generally have the formulae RS < sub > n </ sub > R, where R = alkyl or aryl.
alkyl and with
Metal acetylides can be coupled with primary alkyl halides.
Although not widely employed for esterifications, salts of carboxylate anions can be alkylating agent with alkyl halides to give esters.
For this reason, the S < sub > N </ sub > 2 reaction of an alkyl halide with SCN < sup >−</ sup > often leads to a mixture of RSCN ( an alkyl thiocyanate ) and RNCS ( an alkyl isothiocyanate ).
The product, methylated at the two meta positions with respect to the alkyl substituent, experiences a final methylation at the 4 carbon by a Guaiacol-O-methyltransferase which also operates by a SAM dependent mechanism.
" Thiokol " polymers arise when sodium polysulfide is treated with an alkyl dihalide.
Acridine combines readily with alkyl iodides to form alkyl acridinium iodides, which are readily transformed by the action of alkaline potassium ferricyanide to N-alkyl acridones.
Derivatization of the triazole 5 ' carbon, or replacement of it with a nitrogen ( i. e., the 1, 2, 4, 5 tetrazole 3-carboxamide ) also results in substantial loss of activity, as does alkyl derivatization of the 3 ' carboxamide nitrogen.
Amines may also be prepared from alkyl halides in amine alkylation, the Gabriel synthesis and Delepine reaction, by undergoing nucleophilic substitution with potassium phthalimide or hexamine respectively, followed by hydrolysis.
Acetoacetic acid is a weak acid ( like most alkyl carboxylic acids ) with a pK < sub > a </ sub > of 3. 77.
Two varieties have been popularized, those with branched alkyl groups and those with linear alkyl groups.
Such interactions are subject to steric effects in that very large molecules may have only restricted access to the pores of the stationary phase, where the interactions with surface ligands ( alkyl chains ) take place.
alkyl and R
: Ba + 2 ROH → Ba ( OR )< sub > 2 </ sub > + H < sub > 2 </ sub >↑ ( R is an alkyl or a hydrogen atom )
A polymer that lacks any regular arrangement in the position of its alkyl substituents ( R ) is called atactic.
: ROH + R ' NCO → ROC ( O ) N ( H ) R ' ( R and R ' are alkyl or aryl groups )
: ROH + R ' NCO → ROC ( O ) N ( H ) R ' ( R and R ' are alkyl or aryl groups )
Borate esters are organic compounds of the type B ( OR )< sub > 3 </ sub > where R is an organic residue ( for example alkyl or aryl ).
Haloalkanes are widely used as synthon equivalents to alkyl cation ( R +) in organic synthesis.
They have the formula RS where R is an organic substituent such as alkyl or aryl.
0.173 seconds.