carboxyl group


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Related to carboxyl group: Carboxyl functional group

carboxyl group

(kärbŏk`sĭl), in chemistry, functional groupfunctional group,
in organic chemistry, group of atoms within a molecule that is responsible for certain properties of the molecule and reactions in which it takes part. Organic compounds are frequently classified according to the functional group or groups they contain.
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 that consists of a carbon atom joined to an oxygen atom by a double bond and to a hydroxyl grouphydroxyl group
, in chemistry, functional group that consists of an oxygen atom joined by a single bond to a hydrogen atom. An alcohol is formed when a hydroxyl group is joined by a single bond to an alkyl group or aryl group.
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, OH, by a single bond. Carboxylic acids are compounds whose molecules contain a carboxyl group that is joined to a hydrogen atom, an alkyl groupalkyl group
, in chemistry, group of carbon and hydrogen atoms derived from an alkane molecule by removing one hydrogen atom (see radical). The name of the alkyl group is derived from the name of its alkane by replacing the -ane suffix with -yl, e.g.
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, or an aryl grouparyl group
, in chemistry, group of atoms derived from benzene or from a benzene derivative by removing one hydrogen that is bonded to the benzene ring (see radical). The simplest aryl group is phenyl, C6H5 ; it is derived from benzene.
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 by a single bond to its carbon atom. Dicarboxylic acids, compounds that contain two carboxyl groups, are important in a number of industrial processes. The four main types of reactions of carboxylic acids are chiefly due to either the weak acidity of the hydroxyl hydrogen or to the difference in electronegativityelectronegativity
, in chemistry, tendency for an atom to attract a pair of electrons that it shares with another atom (see chemical bond). For example, the molecule hydrogen chloride, HCl, consists of a hydrogen atom, H, and a chlorine atom, Cl, sharing a pair of electrons.
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 between carbon and oxygen. One type involves cleavage of the hydroxyl oxygen-hydrogen bond, e.g., reaction with an alcohol to form an esterester,
any one of a group of organic compounds with general formula RCO2R′ (where R and R′ are alkyl groups or aryl groups) that are formed by the reaction between an alcohol and an acid.
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 or reaction with an alkali to form a water-soluble salt. A second type involves addition of an electron-rich species to the electron-deficient carbon atom of the carboxyl group. A third type is characterized by the joining of a carbon atom directly to the carboxyl group. A fourth type involves the loss of carbon dioxide (decarboxylation). The second and third types are similar to reactions of the carbonyl groupcarbonyl group
, in chemistry, functional group that consists of an oxygen atom joined by a double bond to a carbon atom. The carbon atom is joined to the remainder of the molecule by two single bonds or one double bond.
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; the carboxyl group may be thought of as a carbonyl group joined to a hydroxyl group.

carboxyl group

[kär′bäk·səl ‚grüp]
(organic chemistry)

carboxyl group

, radical
the monovalent group --COOH, consisting of a carbonyl group bound to a hydroxyl group: the functional group in organic acids
References in periodicals archive ?
DMPA is included in PU frame to enhance the water compatibility after complete deprotonation of the carboxyl group to a carboxylate ion using NaOH, as shown in Scheme 1.
The nonadsorbed carboxyl group that is generated from DAC will remain in the solution and they will build a network easier due to the small molecular weight and nonpolymeric nature of DAC.
The N3 dye has four carboxyl groups in its molecular structure, and N719 has two; this allows them to interact with Ti[O.sub.2] more efficiently and lead to a greater injection of electrons, generate a higher current density, and thus, exhibit a higher conversion efficiency.
The AAc grafting onto silicone films was carried out to develop a surface which is carrying a high density of carboxyl groups. The overall process of AAc grafting through TSPT involved the pretreatment of silicone film with oxygen plasma and subsequent exposure to AAc solution.
From Figure 5, it can be observed that the carboxyl group C=O at 1591 cm-1 have shifted to a lower wavenumber upon enhancement of ionic dopant in CMC-NH4SCN SBE system.
The second important factor is the interaction of the [C.sup.1]-centered and [C.sup.2]-centered radicals respectively with fullerene as a function of the carboxyl group rotate, [phi], with rotating step Iff see Fig.
If the band at 1700-1750 [cm.sup.-1] shows the existence of a free carboxyl group, while at about 1650 [cm.sup.-1], suggests that carboxyl groups are coordinated.
Thus, verification of significance of both amide and carboxyl groups in ion sorption was required.
By comparison with the solution P concentrations, sorption of the phenolic acids was highly dependent upon the number (and position) of hydroxyl groups attached to the benzene ring, rather than the distance of the carboxyl group from the benzene ring.
In this review, the author follows mainly the trail of his studies on four groups of typical enzymes with a catalytic carboxyl group or groups.
The carboxyl group interacts with other residues from the active site, and the distance between this group and Arg325 is too long (Figure 5(b)).
The sulfonic group was used as anchor for several porphyrinand phthalocyanine-based dyes [23] as well as for some polypyridyl complexes [24] but it has been systematically outperformed by the carboxyl group.