Hydrogen Atom Addition to Olefins: Relative Rates at the Two Carbon Positions and Derived Heats of Formation of Several Alkyl Radicals

1965 ◽  
Vol 69 (3) ◽  
pp. 905-908 ◽  
Author(s):  
Richard D. Kelley ◽  
Ralph Klein ◽  
Milton D. Scheer
Keyword(s):  
Hydrogen Atom ◽  
Heats Of Formation ◽  
Alkyl Radicals

Reactivity of Fluorinated Alkyl Radicals in Solution. Some Absolute Rates of Hydrogen-Atom Abstraction and Cyclization

1994 ◽  
Vol 116 (10) ◽  
pp. 4521-4522 ◽  
Author(s):  
Xiao X. Rong ◽  
He-Qi Pan ◽  
William R. Dolbier ◽  
Bruce E. Smart
Keyword(s):  
Hydrogen Atom ◽  
Hydrogen Atom Abstraction ◽  
Alkyl Radicals

Diazen und andere Distickstoffhydride: Bildungswärmen, Dissoziationsenergien, Auftrittspotentiale, Protonenaffinitäten [1] / Diazene and other Dinitrogen Hydrides: Heats of Formation, Dissoziation Energies, Appearance Potentials, Proton Affinities [1]

1979 ◽  
Vol 34 (10) ◽  
pp. 1385-1390 ◽  
Author(s):  
Nils Wiberg ◽  
Gerd Fischer ◽  
Heinz Bachhuber
Keyword(s):  
Hydrogen Atom ◽  
Proton Affinity ◽  
Heat Of Formation ◽  
Heats Of Formation ◽  
Proton Affinities ◽  
Kcal Mole ◽  
Energy Data

AbstractIonisation and appearance potentials were obtained for diazene HN = NH (prepared by thermolysis of TOSN2H2M, M = Li, Na, K), isodiazene H2N = N (prepared by thermolysis of TOSN2H2CS and N2H4 microwave radiolysis, respectively), and other hydrides N2Hn (cf. Table I). The following energy data (kcal/mole) have been determined for diazene: heat of formation (32), enthalpy of isomerisation to isodiazene (13), NN-dissoziation energy (122), NH-dissoziation energy (81), hydrogen atom affinity (45), proton affinity (176).

scholarly journals Titanium and Cobalt Bimetallic Radical Redox Relay for the Isomerization of N-Bz Aziridines to Allylic Amides

Synthesis ◽  
2021 ◽  
Author(s):  
Song Lin ◽  
Devin P. Wood ◽  
Weiyang Guan
Keyword(s):  
Hydrogen Atom ◽  
Hydrogen Atom Transfer ◽  
Alternative Strategy ◽  
Atom Transfer ◽  
Allylic Amination ◽  
Alkyl Radicals ◽  
Mild Conditions

AbstractHerein a bimetallic radical redox-relay strategy is employed to generate alkyl radicals under mild conditions with titanium(III) catalysis and terminated via hydrogen atom transfer with cobalt(II) catalysis to enact base-free isomerizations of N-Bz aziridines to N-Bz allylic amides. This reaction provides an alternative strategy for the synthesis of allylic amides from alkenes via a three-step sequence to accomplish a formal transpositional allylic amination.

The reaction of alkyl radicals with metal oxides I. The reactions of ethyl radicals with molybdenum trioxide

1956 ◽  
Vol 236 (1207) ◽  
pp. 446-453
Keyword(s):  
Hydrogen Atom ◽  
Metal Oxides ◽  
Diethyl Ether ◽  
Ethyl Alcohol ◽  
Molybdenum Trioxide ◽  
Reaction System ◽  
Hydrogen Atoms ◽  
Alkyl Radicals ◽  
Products Of Reaction ◽  
Ethyl Radicals

It has been previously shown that molybdenum trioxide is a very efficient agent for removing hydrogen atoms and alkyl radicals from a reaction system. The nature of this removal process has been investigated for ethyl radicals produced by the addition of a hydrogen atom to ethylene. It is shown that the products of reaction with the oxide include ethyl alcohol and diethyl ether and the probable mode of formation of these two compounds is discussed.

Site-specific hydrogen-atom elimination in photoexcited alkyl radicals

2021 ◽  
Vol 23 (3) ◽  
pp. 2458-2468
Author(s):  
David V. Chicharro ◽  
Alexandre Zanchet ◽  
Aymen Bouallagui ◽  
Luis Rubio-Lago ◽  
Alberto García-Vela ◽  
...  
Keyword(s):  
Hydrogen Atom ◽  
Carbon Atom ◽  
Chemical Structure ◽  
Site Specific ◽  
Alkyl Radicals

A prompt site-specific hydrogen-atom elimination from the α-carbon atom is reported in the photodissociation of several alkyl radicals at 201 nm and discussed in terms of their chemical structure and the role of vibrational promoting modes.

The kinetics of the interaction of atomic hydrogen with olefines. V. Results obtained for a further series of compounds

1950 ◽  
Vol 202 (1069) ◽  
pp. 181-202 ◽  
Keyword(s):  
Double Bond ◽  
Hydrogen Atom ◽  
Atomic Hydrogen ◽  
Methyl Radicals ◽  
Hydrogen Atoms ◽  
Alkyl Radicals ◽  
Kinetics Of ◽  
Interesting Generalization

In this paper the efficiency of interaction of a hydrogen atom with a series of olefines has been determined, the olefines being members of the series obtained by progressively replacing the hydrogen atoms of ethylene by methyl radicals. The interesting generalization which emerges from this is that the efficiency of interaction does not vary very much with the nature of the alkyl substituents in the molecule, and calculations involving the heats of addition of a hydrogen atom to a double bond confirm this generalization. The data presented here are discussed critically in relation to information available on the reaction of CCl 3 radicals with olefines and of alkyl radicals with olefines, complete general agreement being demonstrated.

Sign in / Sign up

Export Citation Format

Share Document