Radiation-induced C—C bond cleavage in 1,2-diarylethanes as model compounds of coal. Part 1.—Pulse and steady-state radiolysis of 1,2-di(1-naphthyl)ethane

1990 ◽  
Vol 86 (2) ◽  
pp. 311-319 ◽  
Author(s):  
Matthias W. Haenel ◽  
Udo-Burckhard Richter ◽  
Sonja Solar ◽  
Nikola Getoff
Keyword(s):  
Steady State ◽  
Bond Cleavage ◽  
Model Compounds ◽  
Radiation Induced

scholarly journals Radiation-Induced C -C Bond Cleavage in 1,2-Diarylethanes as Model Compounds of Coal, Part 3. Pulse and Steady-State Radiolysis of 1,2-Di(9-anthryl)ethane in Organic Solvents

1995 ◽  
Vol 50 (3) ◽  
pp. 303-311 ◽  
Author(s):  
Matthias W Haenel ◽  
Udo-Burckhard Richter ◽  
Sonja Solar ◽  
Nikola Getoff
Keyword(s):  
Steady State ◽  
Reaction Mechanisms ◽  
Polar Solvent ◽  
Bond Cleavage ◽  
Sodium Cation ◽  
Transient Species ◽  
Model Compounds ◽  
Radiation Induced ◽  
Γ Rays ◽  
Ether Solvents

1,2-Di(9-anthryl)ethane (1,2-DAE) was used as a model for coal to study the C -C bond cleavage of the ethano linkage in the radiolysis of solutions containing NaAlH2(OCH2CH2OCH3)2 [NaAlH2(OR)2]. Transient species were investigated by pulse radiolysis of solutions of 1,2-DAE in THF, DME and toluene in the absence and the presence of NaAlH2(OR)2. In the presence of NaAlH2(OR)2 stabilized, long-lived radical anion/sodium cation pairs of 1,2-DAE were generated even in the non-polar solvent toluene. The reaction mechanisms differ substantially for solutions in the ether solvents (THF or DME) and for solutions in toluene. Steady-state radiolysis (60Co γ-rays) of solutions of 1,2-DAE in toluene containing NaAlH2(OR)2 resulted in the C -C bond cleavage of the ethano linkage. This is attributed to the unstable dianion (1,2-DAE2-, 2Na+) formed in two successive radiation- induced reductions via (1,2-DAE∙- , Na+). The resulting (9-anthryl)methyl carbanionic fragments C14H9CH2-, Na+ react with AlH(OR)2 generated in the process, to form the aluminate salts [C14H9CH2AlH(OR)2-, Na+]. From the aluminate salts, 9-methylanthracene (9- MA) was obtained by hydrolysis in yields up to 65 wt.%.

Radiation-induced effects in lignin model compounds: a pulse and steady-state radiolysis study

Tetrahedron ◽  
1993 ◽  
Vol 49 (43) ◽  
pp. 9689-9698 ◽  
Author(s):  
Claudio A. Chuaqui ◽  
Srinivasan Rajagopal ◽  
Andras Kovács ◽  
Terry Stepanik ◽  
John Merritt ◽  
...  
Keyword(s):  
Steady State ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Radiation Induced ◽  
Lignin Model

Theoretical analysis of means of preventing Si–C bond cleavage during polycondensation of organosilanes to organosilicas

2021 ◽  
Author(s):  
Soichi Shirai ◽  
Shinji Inagaki
Keyword(s):  
Theoretical Analysis ◽  
Ab Initio ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Bond Cleavage ◽  
Model Compounds ◽  
Analysis Of Means

Practical strategies for suppressing Si–C cleavage during the polycondensation of organosilanes were presented based on ab initio quantum chemical calculations of model compounds.

Electronic Spectral Investigations upon the Photochemical Transformations of Some Substituted 1-(N,N-bisacyl)amino-4,5-diphenyl-l,2,3-triazoles

2001 ◽  
Vol 56 (6-7) ◽  
pp. 452-458
Author(s):  
Irina Petkova ◽  
Apostolos J. Maroulis ◽  
Constantina Hadjiantoniou-Maroulis ◽  
Peter Nikolov
Keyword(s):  
Steady State ◽  
Room Temperature ◽  
Uv Light ◽  
Uv Absorption ◽  
Luminescence Spectra ◽  
Model Compounds ◽  
Photochemical Transformations ◽  
Absorption And Luminescence Spectra ◽  
Photochemical Properties ◽  
Substituted 1

Abstract The objective of this report is to investigate the steady state and dynamic photophysical and photochemical properties of 1-(N,N-bisacyl)amino-4,5-diphenyl-1,2,3-triazoles in solvents of dif­ferent polarity at room temperature and in frozen matrix at 77 K. On the basis of the comparison of their UV absorption and luminescence spectra with those of 4,5-diphenyl-1,2,3-triazole and diben-zamide (model compounds), cleavage of the N-N bond in the title compounds after irradiation with polychrome UV light is proved.

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