Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Hydrogen isotopic

A simple example occurs with hydrogen, which occurs naturally as three isotopes (hydrogen, deuterium, tritium), all of atomic number 1 but having atomic masses of 1, 2, and 3 respectively. [Pg.425]

Hydrogen The first chemical element in the periodic table. It has the atomic symbol H, atomic number 1, and atomic weight 1. It exists, under normal conditions, as a colorless, odorless, tasteless, diatomic gas. Hydrogen ions are protons. Besides the common HI isotope, hydrogen exists as the stable isotope deuterium and the unstable, radioactive isotope tritium. [NIH]... [Pg.68]

The present article is a review of tt complex adsorption which has recently been proposed in catalytic reaction mechanisms (2-11). The main evidence for this intermediate has been obtained from isotopic hydrogen exchange reactions with aromatic compounds where an interpretation according to classical theories has met with increasing difficulties. The limitations of the classical associative and dissociative exchange mechanisms originally proposed by Horiuti and Polanyi (12) and Farkas and Farkas (13-15) re discussed. This is followed by a... [Pg.95]

There are three methods that are widely used to follow the rates of isotopic hydrogen exchange in heterocyclic compounds. First, infrared spectroscopy enables the replacement of a hydrogen atom by a deuterium atom within a molecule to be detected. When an —H bond becomes an X—D bond there is a reduction in the stretching frequency... [Pg.2]

Useful labelled compounds containing deuterium or tritium normally require the isotopic hydrogen to be attached to carbon, so the acid-base equilibrium will require cleavage of a C-H bond, where acid... [Pg.158]

The small moments in isotopic hydrogen, HD and HT, for example, do not interest us here. [Pg.113]

Isotopes of an element have the same number of protons but different numbers of neutrons and hence different mass numbers. The three hydrogen isotopes have special names protium for hydrogen-1, deuterium for hydrogen-2, and tritium for hydrogen-3. Of these three isotopes, hydrogen-1 is most common. For most elements, such as iron, the isotopes have no special names and are indicated merely by mass number. [Pg.94]

Isotopic Hydrogen Labeling of Heterocyclic Compounds by One-Step Method G. E. Calf and J. L. Garnett, Adv. Heterocycl. Chem., 1973,15, 137-186. [Pg.74]


See other pages where Hydrogen isotopic is mentioned: [Pg.411]    [Pg.122]    [Pg.265]    [Pg.4]    [Pg.6]    [Pg.12]    [Pg.352]    [Pg.160]    [Pg.161]    [Pg.170]    [Pg.135]    [Pg.9]    [Pg.2]    [Pg.16]    [Pg.21]    [Pg.158]    [Pg.392]    [Pg.227]    [Pg.240]    [Pg.770]   
See also in sourсe #XX -- [ Pg.6 ]

See also in sourсe #XX -- [ Pg.79 , Pg.85 , Pg.87 , Pg.89 , Pg.97 ]




SEARCH



Acid-catalyzed hydrogen isotope

Acid-catalyzed hydrogen isotope exchange

Amino acids, chiral, hydrogen-isotope

Aromatic compounds hydrogen isotope exchange reactions

Aromatic substitution reactions, hydrogen isotope effects

Asymmetric hydrogenation deuterium isotope effects

Atomic data, hydrogen isotopes

Base-catalyzed hydrogen isotope

Base-catalyzed hydrogen isotope aromatics

Base-catalyzed hydrogen isotope exchange

Base-catalyzed hydrogen isotope preparation

Biotransformations in the Preparation of Compounds Labeled with Carbon and Hydrogen Isotopes

Calf, G. E., Garnett, J. L., isotopic Hydrogen

Calf, G. E., Garnett, J. L., isotopic Hydrogen Labeling of Heterocyclic Compounds

Calf, G. E., Garnett, J. L., isotopic Hydrogen One-Step Methods

Carbon and hydrogen isotope

Deuterium isotope effects hydrogen shifts

Deuterium isotope effects hydrogen tunneling

Deuterium isotope effects, and hydrogen

Deuterium isotope effects, and hydrogen bonding

Deuterium/hydrogen isotope ratio

Due to the Presence of Hydrogen Isotopes at Noncyclic Positions (Arigoni and Eliel)

Enzymes mechanistic studies, hydrogen isotope

Enzymes with hydrogen isotopes

Epidote hydrogen isotope fractionation

Exchange reactions hydrogen isotopes

Exchange reactions, hydrogen isotope ammonia

Exchange reactions, hydrogen isotope, of organic compounds in liquid ammonia

Heterocyclic chemistry isotopic hydrogen labeling

Heterocyclic compounds isotopic hydrogen labeling

High-pressure hydrogenated carbon hydrogen isotope

Hornblende hydrogen isotopes

Hydrogen Isotope Retention

Hydrogen Isotopes - Deuterium and Tritium

Hydrogen Isotopes at Noncyclic Positions, Chirality Due to the Presence of (Arigoni and Eliel)

Hydrogen adsorption isotopes

Hydrogen and its isotopes

Hydrogen atom isotopes

Hydrogen atom transfers, isotope effects

Hydrogen bonding geometric isotope effects

Hydrogen bonding isotope fractionation factors

Hydrogen isotope composition

Hydrogen isotope effect

Hydrogen isotope effects and

Hydrogen isotope effects in aromatic

Hydrogen isotope effects in aromatic substitution reactions

Hydrogen isotope effects, thermodynamics

Hydrogen isotope exchange

Hydrogen isotope exchange measurements

Hydrogen isotope exchange techniques

Hydrogen isotope ratio mass spectrometry

Hydrogen isotope separation

Hydrogen isotope variations

Hydrogen isotopes

Hydrogen isotopes

Hydrogen isotopes and their properties

Hydrogen isotopes fractionations

Hydrogen isotopes inductive effects

Hydrogen isotopes ocean water)

Hydrogen isotopes precipitation)

Hydrogen isotopes preparation

Hydrogen isotopes standard

Hydrogen isotopes steric effects

Hydrogen isotopes, recycling

Hydrogen isotopic composition

Hydrogen isotopic fractionation

Hydrogen isotopic ratios

Hydrogen kinetic isotope effect studie

Hydrogen kinetic isotope effects

Hydrogen molecules, isotopically substituted

Hydrogen radioactive isotopes

Hydrogen relative isotopic abundance

Hydrogen stable isotope ratio analysis

Hydrogen transfer isotope effects

Hydrogen, electrode reactions isotope effect

Hydrogen, isotopes sugars specifically labeled with

Hydrogen, stable isotopes

Hydrogen-deuterium isotope electronic states

Hydrogen-deuterium kinetic isotope effect

Hydrogen-tritium kinetic isotope effects

Hydrogen/deuterium isotope effects

Hydrogen/deuterium reaction with kinetic isotope effect

Hydrogenation isotope effect

Hydrogenation, Isomerization, and Isotopic Exchange of Unsaturated Hydrocarbons

Isothiazoles Isotopic hydrogen labeling of heterocyclic

Isotope analyses hydrogen

Isotope effects hydrogen migration

Isotope effects, hydrogen bond relaxation

Isotope hydrogen isotopes

Isotope hydrogen-deuterium

Isotope shift hydrogen

Isotopes of hydrogen

Isotopic enrichment hydrogen

Isotopic exchange between hydrogen and

Isotopic hydrogen exchange, liquid

Isotopic hydrogen labeling

Isotopic hydrogen labeling of heterocyclic

Isotopic hydrogen labeling of heterocyclic compounds, one-step methods

Isotopic study of coal-associated hydrogen

Isotopic study of coal-associated hydrogen sulfide

Isotopically substituted hydrogen

Kaolinite hydrogen isotope fractionation

Kinetic Isotope Effect for Metals with High Hydrogen Overpotentials

Kinetic isotope effect hydrogen isotopes

Kinetic isotope effects carbon-hydrogen insertions

Kinetic isotope effects hydrogen shifts

Kinetic isotope effects primary hydrogen-deuterium

Kinetic isotope effects secondary alpha hydrogen-deuterium

Kinetic isotope effects secondary hydrogen-deuterium

Labeled with isotopes of hydrogen

Labeling techniques, hydrogen isotope

Labeling with hydrogen isotopes

Mantle hydrogen isotope composition

Mechanistic studies, hydrogen isotope

Multiple-isotope Probes of Hydrogen Tunneling

Palladium hydrogen isotope separation

Primary hydrogen isotope effects on eliminations and rearrangements

Primary hydrogen isotope effects on simple bond cleavage

Primary kinetic hydrogen isotope effects

Reduction with hydrogen isotopes

SLAP , hydrogen isotopes

Secondary hydrogen isotope effects

Separation Process Hydrogen Isotopes

Solutions of Hydrogen Isotopes

Solvent-exchange hydrogen isotopes

Solvent-exchange with hydrogen isotopes

Specifically labeled with isotopes hydrogen

Sugars Specifically Labeled with Isotopes of Hydrogen

Sulfate/hydrogen sulfide, sulfur isotopic

Sulfate/hydrogen sulfide, sulfur isotopic composition

The Radioactive Heavy Hydrogen Isotope

The Three Isotopes of Hydrogen

Titanium hydrogen system: isotope effects

Tritium-hydrogen isotope exchange

VSMOW , hydrogen isotopes

© 2024 chempedia.info