Hydrogen in organic compounds

Hot atom reactions have also been used to label organic compounds with T. Irradiation of helium-3 with neutrons according to the nuclear reaction produces very energetic tritium atoms that can displace ordinary hydrogen in organic compounds. This procedure is not very selective, and the labeling pattern must be determined to enable the tritiated product to be used effectively as a tracer (34). 

As with other groups, halogens can substitute hydrogen in organic compounds containing additional functional moieties such as carboxylic acids to form acid chlorides, e.g. acetyl chloride CH3COCI. These are reactive acidic compounds liberating hydrochloric acid on contact with water. 

A. I. Shatenshtein, Isotopic Exchange and the Replacement of Hydrogen in Organic Compounds, Consultants Bureau, New York, 1962, p. 105. 

For organic lab, traditionally you look only at the signals from protons in your compound, so sometimes this technique is called proton magnetic resonance (PMR). Not naked H+ protons either, eh The everyday hydrogens in organic compounds are just called protons when you use this technique. 

Korshun method analychem Microdetermination of carbon and hydrogen in organic compounds the sample is prepyrolyzed (cracked) in a shortage of oxygen, then oxidized in an excess of oxygen. kor shan. meth ad ... 

In addition to his work on titrimetry, Gay-Lussac made important contributions in other areas of analytical chemistry. He studied the reactions of hydrogen sulphide in different media, thus laying the foundations for the classification of metals into different analytical groups, and in conjunction with Thenard, he developed the first truly practicable method for the determination of carbon and hydrogen in organic compounds.54... 

In 1872 Newlands 2 associated hydrogen with chlorine, because chlorine can replace hydrogen in organic compounds without material alteration in the character of the substances, and because he considered that its atomic weight shows it to be the lowest member of the halogen group. 

How can we prove the presence of carbon and hydrogen in organic compounds ... 

III. Hydrogen in organic compounds forms water when heated with CuO. 

The Bronsted theory of acids and bases defines an acid as a proton donor and a base as a proton acceptor, i.e. a pro tic acid such as hydrochloric acid is a source of protons. Although the idea of an acidic hydrogen in organic compounds may initially be understood in terms of a carboxyl hydroxyl group, a hydrogen atom may become weakly acidic in a number of other circumstances, e.g. when it is attached to a carbon atom that is adjacent to a carbonyl group. On the other hand, a base such as an amine, or a carboxylate anion, is capable of accepting a proton. 

Finally, the classical method for the determination of cai bon and hydrogen in organic compounds is a gravimetric volatilization procedure in which the combustion products (H2O and CO2) are collected selectively on weighed absorbents. The increase in mass serves as the analytical parameter. 

The techniques used by VeSefa [49] for the automatic microdetermination of carbon and hydrogen in organic compounds do not differ from the chromatographic method, except that chemical absorbers are used instead of the chromatographic column as a result, it is possible to detect only one product. An original sample of 1.0-1.6 mg was mixed with 30—40 mg of mixed oxides of cobalt and rapidly combusted in a quartz tube containing an appropriate catalyst. 

N.E. Gelman and E.N. Bune, Opredeleniye Ugleroda i Vodoroda v Organicheskikh Soyedineni-yakh (Determination of Carbon and Hydrogen in Organic Compounds), Nauka, Moscow, 1974. 

The mechanism of the catalytic activation of hydrogen gas and of hydrogen in organic compounds is of importance for numerous industrial processes, and for the problem of biological oxidation. In addition, there is the quite general problem of the relation between catalyst constitution and... 

The biological activation of hydrogen in organic compounds, forming, as it does, the first step in biological oxidations, is a vast field, which we cannot attempt to review here. The few remarks that follow are only intended to relate this field to the activation of hydrogen by metals, as it is quite likely that there is a common basis for catalytic activity in the two cases. 

Eastham and Raaen (1959) discuss the determination of active hydrogen in organic compounds by means of tritium exchange. 

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