Synthèse de divers types d'hétérocycles fonctionnels par décomposition de peroxydes insaturés: réactions compétitives

1995 ◽  
Vol 73 (2) ◽  
pp. 161-168 ◽  
Author(s):  
E. Montaudon ◽  
L. Lemée ◽  
M-J. Bourgeois
Keyword(s):  
Hydrogen Donor ◽  
Hydrogen Shift ◽  
Donor Solvent ◽  
Intramolecular Substitution

Decomposition of γ-unsaturated substituted peroxides in a good hydrogen donor solvent can lead to two diastereoisomeric oxetans. An intramolecular 1,5 hydrogen shift followed by a cyclization may compete with the homolytic intramolecular substitution following the first addition step. The factors governing this never-reported competition are determined. Keywords: unsaturated peroxides, oxetans, homolytic intramolecular substitution, intramolecular 1,5 hydrogen shift.

Hydrotreating of Hydrochloric Acid Lignin in a Hydrogen-Donor Solvent

1982 ◽  
Vol 2 (1) ◽  
pp. 17-31 ◽  
Author(s):  
Tor P. Schultz ◽  
Raymond J. Preto ◽  
J. Lynn Pittman ◽  
Irving S. Goldstein
Keyword(s):  
Hydrochloric Acid ◽  
Hydrogen Donor ◽  
Donor Solvent

scholarly journals Theoretical Study on the Mechanism of Hydrogen Donation and Transfer for Hydrogen-Donor Solvents during Direct Coal Liquefaction

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 648 ◽  
Author(s):  
Haigang Hao ◽  
Tong Chang ◽  
Linxia Cui ◽  
Ruiqing Sun ◽  
Rui Gao
Keyword(s):  
Density Functional ◽  
Hydrogen Gas ◽  
Hydrogen Donor ◽  
Coal Liquefaction ◽  
Hydrogen Atoms ◽  
Functional Theory ◽  
Donor Solvent ◽  
National Energy Security ◽  
Liquefaction Process ◽  
Direct Coal Liquefaction

As a country that is poor in petroleum yet rich in coal, it is significant for China to develop direct coal liquefaction (DCL) technology to relieve the pressure from petroleum shortages to guarantee national energy security. To improve the efficiency of the direct coal liquefaction process, scientists and researchers have made great contributions to studying and developing highly efficient hydrogen donor (H-donor) solvents. Nevertheless, the details of hydrogen donation and the transfer pathways of H-donor solvents are still unclear. The present work examined hydrogen donation and transfer pathways using a model H-donor solvent, tetralin, by density functional theory (DFT) calculation. The reaction condition and state of the solvent (gas or liquid) were considered, and the specific elementary reaction routes for hydrogen donation and transfer were calculated. In the DCL process, the dominant hydrogen donation mechanism was the concerted mechanism. The sequence of tetralin donating hydrogen atoms was α-H (C1–H) > δ-H (C4–H) > β-H (C2–H) > γ-H (C3–H). Compared to methyl, it was relatively hard for benzyl to obtain the first hydrogen atom from tetralin, while it was relatively easy to obtain the second and third hydrogen atoms from tetralin. Comparatively, it was easier for coal radicals to capture hydrogen atoms from the H-donor solvent than to obtain hydrogen atoms from hydrogen gas.

scholarly journals Basic study of extractive liquefaction of coal. II. Coal liquefaction with the recycled hydrogen donor solvent.

1985 ◽  
Vol 64 (1) ◽  
pp. 26-35
Author(s):  
Ryohei MINAMI ◽  
Tamio SHIRAFUJI ◽  
Mikio KATO ◽  
Yoshihiko SUNAMI
Keyword(s):  
Hydrogen Donor ◽  
Coal Liquefaction ◽  
Basic Study ◽  
Donor Solvent

scholarly journals Transformation Characteristics of Hydrogen-Donor Solvent Tetralin in the Process of Direct Coal Liquefaction

2019 ◽  
Vol 7 ◽  
Author(s):  
Hai-zhou Chang ◽  
Jun-qi Li ◽  
Shuai Du ◽  
Kai-yuan Shen ◽  
Qun Yang ◽  
...  
Keyword(s):  
Hydrogen Donor ◽  
Coal Liquefaction ◽  
Donor Solvent ◽  
Direct Coal Liquefaction

Catalytic wood liquefaction using a hydrogen donor solvent

1986 ◽  
Vol 64 (5) ◽  
pp. 775-780 ◽  
Author(s):  
Paulo E. Araya ◽  
Sergio E. Droguett ◽  
Heinz J. Neuburg ◽  
Ricardo Badilla-Ohlbaum
Keyword(s):  
Hydrogen Donor ◽  
Donor Solvent ◽  
Wood Liquefaction

Upgrading of petroleum vacuum residue using a hydrogen-donor solvent with acid-treated carbon

2018 ◽  
Vol 161 ◽  
pp. 234-242 ◽  
Author(s):  
Doo-Wook Kim ◽  
Pil Rip Jeon ◽  
Seunghyun Moon ◽  
Chang-Ha Lee
Keyword(s):  
Hydrogen Donor ◽  
Vacuum Residue ◽  
Donor Solvent ◽  
Treated Carbon

Studies on the thermal coking of bitumen. I. The use of pyrene-d10 as a probe for evaluating the extent of hydrogen shuttling reaction

1991 ◽  
Vol 69 (1) ◽  
pp. 116-120 ◽  
Author(s):  
M. J. Kirk ◽  
T. S. Sorensen
Keyword(s):  
Free Radicals ◽  
Key Words ◽  
Hydrogen Exchange ◽  
Solvent Free ◽  
Hydrogen Donor ◽  
Organic Reactions ◽  
Hydrogen Atoms ◽  
Donor Solvent ◽  
Key Words Bitumen

The organic reactions that take place during the thermal coking of bitumen are extremely complex and deep-seated, but obviously hydrogen atoms originally attached to carbons that form coke will have moved to a new carbon site (net addition of hydrogen, resulting in upgraded bitumen). Accompanying this process, one expects some general hydrogen shuttling between non-coking molecules. This paper describes an approach to determing the extent of this latter process by the addition of a small amount of perdeuterated pyrene to the bitumen prior to the coking operation. The in situ pyrene functions as in indicator, allowing one to establish the extent and other mechanistic details of the "hydrogen donor" reactions that take place during coking. There is no indication that the pyrene substantially modifies the normal course of the reaction, hence the analogy to an indicator. Key words: bitumen coking, pyrene, hydrogen exchange, donor solvent, free radicals.

Three-level structure change of asphaltenes undergoing conversion in a hydrogen donor solvent

Fuel ◽  
2019 ◽  
Vol 255 ◽  
pp. 115736 ◽  
Author(s):  
Qiang Sheng ◽  
Gang Wang ◽  
Nan Jin ◽  
Maen M. Husein ◽  
Jinsen Gao
Keyword(s):  
Level Structure ◽  
Structure Change ◽  
Hydrogen Donor ◽  
Donor Solvent

Chemistry of Texas lignite liquefaction in a hydrogen-donor solvent system

Fuel ◽  
1982 ◽  
Vol 61 (4) ◽  
pp. 351-356 ◽  
Author(s):  
C PHILIP ◽  
R ANTHONY
Keyword(s):  
Solvent System ◽  
Hydrogen Donor ◽  
Donor Solvent

Short contact time liquefaction of coal using hydrogen donor solvent

Fuel ◽  
1984 ◽  
Vol 63 (11) ◽  
pp. 1615-1618 ◽  
Author(s):  
Takanobu Kawai ◽  
Kunio Esumi ◽  
Kenjiro Meguro ◽  
Hidemasa Honda
Keyword(s):  
Contact Time ◽  
Hydrogen Donor ◽  
Short Contact ◽  
Short Contact Time ◽  
Donor Solvent
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