hydroxyl group


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Related to hydroxyl group: Sulfhydryl group

hydroxyl group

(hīdrŏk`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 an oxygen atom joined by a single bond to a hydrogen atom. An alcoholalcohol,
any of a class of organic compounds with the general formula R-OH, where R represents an alkyl group made up of carbon and hydrogen in various proportions and -OH represents one or more hydroxyl groups.
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 is formed when a hydroxyl group is joined by a single bond to 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 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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. A metal hydroxide is formed when a hydroxyl group is joined to a metal (e.g., sodium hydroxide).
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References in periodicals archive ?
In this article, the acetylation reaction between formaldehyde and the hydroxyl group on the surface of the CA membrane was used to investigate the effect of crosslinking temperature, crosslinking time, and formaldehyde solution mass fraction on the performance of the CA membrane.
LDPE exposed to C[O.sub.2] laser radiation undergoes an increase in this IR absorption band, indicating a simultaneous formation and accumulation of hydroperoxides in LDPE films; these results are consistent with the increase in the carbonyl and hydroxyl groups concentration, Figures 3(a) and 4(a), respectively.
As mentioned, the antioxidant ability of the phenolic acids is greatly influenced by the number and the relative position of the hydroxyl groups in the ring.
However, isoscutellarein and kaempferol have only one hydroxyl group attached on the B ring at C-4' position as compared to quercetin (Table 4).
Arg131 interacts with oxygen (carboxyl group) to one side of benzene ring while Asp40 was found in polar interaction with H (hydroxyl group) of compound 1 (Figure S4).
The aim in this article is to analyse the three cyclodextrins by using near infrared spectroscopy and gravimetry to reveal the nature of the hydroxyl groups in the molecules.
(3,20) For the PUA cured films without PIH, the increased decomposition temperature is possible because the added hydroxyl group of HEA produces enhanced hydrogen bonding interaction in the copolymers, which yields high crosslinking density.
We found that the hydroxyl group at position C-3 of the ursane-type triterpenoids plays an indispensable role in inhibiting osteoclast differentiation (Fig.
Item Value Target panel density (ovendry basis) (lb/[ft.sup.3]) 40 Mat dimensions (in.) 20 by 23 Target panel thickness, mm (in.) 11.1 (7/16) Mat composition: face/core/face 25/50/25 Resin dosage Face (%) 3 Core (%) 3 Wax dosage Face (%) 1 Core (%) 1 Face water moisture before resin and wax (%) ~2 Core water moisture before resin and wax (%) ~2.5 Core mat moisture after resin and wax (%) ~3.5 Face mat moisture after resin and wax (%) 7-8 Press temperature ([degrees]C) 220 Table 3.--Phenolic hydroxyl group of unmodified and biomodified organosolv lignin.
Function-structure analysis indicated 1) flavonoids with more free phenolic hydroxyl groups showed relative higher antiplatelet and antiradical activities; 2) substitution of 7-OH of A ring affected antiplatelet capacities of flavanones apparently; 3) free 3-OH of C ring was important for both the antiplatelet and antiradical activities of flavonol (quercetin) and flavones (rutin isoquercitrin); 4) C ring C2-C3 double bond and B ring 3'-4'orthodihydroxy might be important for its antiradical function.
Since B-z[(OH).sub.3] contain hydroxyl groups, the influence of -OH group on the ring opening polymerization of B -z[(OH).sub.3] during cure was monitored by DSC (Fig.
The main differences are the orientation of the hydroxyl group at position C17 for 17[alpha]-AED and 17[beta]-AED, the orientation and position of the hydroxyl group at position C7 for 17[beta]-AET, and the ketone group at position 17 for DHEA.