Hydrogen atom removal

The lactate is oxidized (two hydrogen atoms removed) and the NAD+ is reduced to NADH + H+... 

Aryl group. An aromatic hydrocarbon with a hydrogen atom removed is called an aryl group, designated by Ar—. 

Phenyl group. The benzene ring with one hydrogen atom removed (CeHs—) is called the phenyl group, designated by Ph—. 

Halogenated A compound that has had a halogen atom substituted for another hydrogen atom. A halogenated hydrocarbon is a hydrocarbon that has had at least one hydrogen atom removed and replaced by a halogen. 

Hydrocarbon Derivative A compound that began as a hydrocarbon, had a hydrogen atom removed from the chain somewhere, and had functional group attached to replace the hydrogen atom. 

Substituted A compound that has had one or more of its atoms removed and replaced by atoms of other elements in the molecule. A substituted hydrocarbon is a compound that has had a hydrogen atom removed and another atom substituted for it. 

The dehydrogenation of an alcohol to a ketone or aldehyde (Eq. 15-1) is one of the most frequent biological oxidation reactions. Although the hydrogen atoms removed from the substrate are often indicated simply as 2[H], it was recognized early in the twentieth century that they are actually transferred to hydrogen-carrying coenzymes such as NAD+, NADP+, FAD, and riboflavin... 

In some organisms, especially bacteria, energy may be obtained through oxidation of H2, H2S, CO, or Fe2+ rather than of the hydrogen atoms removed from organic substrates. Furthermore, some bacteria use anaerobic respiration in which NOs, S042, or C02... 

Conjunctive name a combination of two names, one of which represents a cyclic structure and the other an acyclic chain, with one hydrogen atom removed from each e.g.. benzenemethanol. 

Propane has six primary hydrogens and two secondary. In the chlorination of propane, the relative proportions of hydrogen atom removal are given by the product of the statistical distribution and the relative rate per hydrogen. Given that a secondary hydrogen is abstracted 3.9 times faster than a primary one, we write the expression for the amount of chlorination at the primary relative to that at the secondary position as ... 

Figure 6.6 X-ray crystal structure of the NO+ complex of O propyl p I bulylcalix 4]arcnc, propyl groups and hydrogen atoms removed for clarity (Copyright Wiley VCH Verlag GmbH Co. KGaA. Reproduced by permission).

Figure 17. Contact ion-pair salt receptor schematic and crystallographic representation (X-ray structure shows receptor with methanol and water bound. Non-acidic receptor hydrogen atoms removed for clarity).

Fig. 4.7 A haemoglobin subunit [16] and its porphyrin core (left, hydrogen atoms removed for clarity)...

A reactive intermediate in some nucleophilic aromatic substitutions, benzyne is benzene with two hydrogen atoms removed. It can be drawn with a highly strained triple bond in the six-membered ring. (p. 789)... 

The photolysis of non-photochromic l-acetoxy-9,10-anthraquinone in alcohols resulted in a photochemical reaction of hydrogen atom removal from solvent.21 This reaction is typical for 9,10-anthraquinones. The absorption spectmm that was observed after a flash pulse was similar to the absorption spectrum of the anthrasemiquinone radical. The lifetime of this radical depended on the oxygen concentration in solution. 

Plate 22 (Figure 3.12). (a) he spherical capsule consisting of six pyrogallol[4]arene molecules shown in the capped-stick metaphor, and (b) with the carbon and hydrogen atoms removed. Hydrogen bonds are shown as thin, solid red lines. Parts (c) and (d) show the remarkable correspondence of the hydrogen bonded pattern with the Archimediean solid, the small rhombicuboctahedron. 

To address this issue directly. Moss and Frey performed tritium tracer experiments to establish whether hydrogen migration is an intramolecular process, or whether the hydrogen initially removed from the 3-pro-R position of the substrate equilibrates with a group or pool of hydrogen atoms located apart from the substrate. In the latter case, the number of constituents therein would govern on a statistical basis how often the particular hydrogen atom removed from the... 

Acids are related to anions for every hydrogen atom removed from the formula of an acid, one negative charge is added in the resulting anion. 

Branches consisting of a hydrocarbon molecule with one hydrogen atom removed are named with the -me ending replaced by -yl. Thus a one-carbon branch, CH3—, is called methyl. 

Figure 2.27 ORTEP diagram of [Na(DB18C6)H20][Tb(L )2] with the thermal ellipsoids drawn at the 30% probability level and the hydrogen atoms removed for clarity [59]. (Reprinted with penmssion from P.N. Remya, S. Bijn, M.L.P. Reddy, A.H. Cowley and M. Findlater, ID Molecnlar ladder of the ionic complex of terbinm-4-sebacoylbis( 1 -phenyl-3-methyl-5-pyrazolonate) and sodium dibenzo-18-crown-6 synthesis, crystal structure, and photophysical properties, Inorganic Chemistry, 47, 7396-7404, 2008. 2008 American Chemical Society.)...

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