Laser flash photolysis study of substituent effects on the rate of 1,2-H migration in a series of benzylchlorocarbenes

1992 ◽  
Vol 114 (10) ◽  
pp. 3604-3607 ◽  
Author(s):  
Michael T. H. Liu ◽  
Roland Bonneau
Keyword(s):  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Substituent Effects ◽  
Laser Flash

Substituent effects in the photochemistry of 5-aryl-3,3-diphenyl-2(3H)-furanones. Steady-state and laser flash photolysis studies

1988 ◽  
Vol 53 (25) ◽  
pp. 5826-5831 ◽  
Author(s):  
S. Pratapan ◽  
K. Ashok ◽  
D. R. Cyr ◽  
P. K. Das ◽  
M. V. George
Keyword(s):  
Steady State ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Substituent Effects ◽  
Laser Flash

Substituent effects on silene reactivity — Reactive silenes from photolysis of phenylated tri- and tetrasilanes

2008 ◽  
Vol 86 (12) ◽  
pp. 1105-1117 ◽  
Author(s):  
William J Leigh ◽  
Andrey G Moiseev ◽  
Eugenie Coulais ◽  
Farahnaz Lollmahomed ◽  
Mohammad S Askari
Keyword(s):  
Phenyl Ring ◽  
Kinetic Data ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Substituent Effects ◽  
Laser Flash ◽  
Acetonitrile Solution ◽  
Ortho Position ◽  
Absolute Rate ◽  
Reported Data

Laser flash photolysis of 2-phenylheptamethyltrisilane (5d), 2,2-diphenylhexamethyltrisilane (5e), and phenyltris(trimethylsilyl)silane (5f) in hexane and acetonitrile solution affords strong, long-lived transient absorptions centered in the 440–470 nm range, which are assigned to the transient silenes formed via [1,3]-trimethylsilyl migration into the ortho-position of a phenyl ring on the basis of their UV–vis spectra and kinetic data for their reactions with methanol (MeOH), acetic acid (AcOH), acetone, 2,3-dimethyl-1,3-butadiene (DMB), carbon tetrachloride (CCl4), and oxygen. The silene derivatives are formed along with the corresponding silylenes (SiMePh, SiPh2, and Si(SiMe3)Ph, respectively) upon photolysis of these compounds in solution, and indeed, weak, short-lived transient absorptions assignable to the silylenes can also be detected in laser photolysis experiments with the three compounds in hexane, superimposed on the much more prominent absorptions due to the silenes. The silylene absorptions are quenched by MeOH and triethylsilane (Et3SiH) with absolute rate constants varying over the narrow ranges of (1.1–1.8) × 1010 (mol/L)–1 s–1 and (2.5–3.6) × 109 (mol/L)–1 s–1, respectively, in excellent agreement with previously reported values for SiPh2 and SiMe2 under the same conditions. The kinetic data obtained for the silenes are compared to previously reported data for the reactions of the same substrates with the related silenes (6a–6c) formed by photolysis of pentamethylphenyl-, 1,1,1,2-tetramethyl-2,2-diphenyl-, and 1,1,1-trimethyl-2,2,2-triphenyldisilane (5a–5c, respectively) under similar conditions. The comparison provides the first systematic, quantitative assessment of the stabilizing effects of trialkylsilyl substitution at the silenic silicon atom in silene derivatives.Key words: silene, silylene, trisilane, tetrasilane, kinetics.

ChemInform Abstract: Substituent Effects in the Photochemistry of 5-Aryl-3,3-diphenyl-2(3H)-furanones. Steady-State and Laser Flash Photolysis Studies.

ChemInform ◽  
1989 ◽  
Vol 20 (22) ◽  
Author(s):  
S. PRATAPAN ◽  
K. ASHOK ◽  
D. R. CYR ◽  
P. K. DAS ◽  
M. V. GEORGE
Keyword(s):  
Steady State ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Substituent Effects ◽  
Laser Flash

Substituent Effects on the Reactivity of the Silicon−Carbon Double Bond. Substituted 1,1-Dimethylsilenes from Far-UV Laser Flash Photolysis of α-Silylketenes and (Trimethylsilyl)diazomethane

1999 ◽  
Vol 121 (20) ◽  
pp. 4744-4753 ◽  
Author(s):  
William J. Leigh ◽  
Corinna Kerst ◽  
Rabah Boukherroub ◽  
Tracy L. Morkin ◽  
Stephen I. Jenkins ◽  
...  
Keyword(s):  
Double Bond ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Substituent Effects ◽  
Laser Flash ◽  
Uv Laser ◽  
Carbon Double Bond ◽  
Silicon Carbon ◽  
Trimethylsilyl Diazomethane

Primary Photochemical Processes of the Phototoxic Neuroleptic Cyamemazine: A Study by Laser Flash Photolysis and Steady State Irradiation

2004 ◽  
Author(s):  
Patrice Morlière ◽  
Francisco Bosca ◽  
Miguel Miranda ◽  
José Castell ◽  
René Santus
Keyword(s):  
Steady State ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Photochemical Processes

Effect of Aggregation on Bacteriochlorin a Triplet-state Formation: A Laser Flash Photolysis Study¶

2002 ◽  
Vol 76 (5) ◽  
pp. 480 ◽  
Author(s):  
Xavier Damoiseau ◽  
Francis Tfibel ◽  
Maryse Hoebeke ◽  
Marie-Pierre Fontaine-Aupart
Keyword(s):  
Triplet State ◽  
State Formation ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash

A Laser Flash Photolysis and Pulse Radiolysis Study of Primary Photochemical Processes of Flumequine¶

2000 ◽  
Vol 72 (4) ◽  
pp. 451 ◽  
Author(s):  
M. Bazin ◽  
F. Bosca ◽  
M. L. Marin ◽  
M. A. Miranda ◽  
L. K. Patterson ◽  
...  
Keyword(s):  
Pulse Radiolysis ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Photochemical Processes

Laser Flash Photolysis in a O3 / Cl2 Mixture in a Very Low Pressure Flow System

2005 ◽  
Author(s):  
Jorge Codnia ◽  
Francisco Manzano ◽  
María Laura Azcárate
Keyword(s):  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Flow System ◽  
Laser Flash ◽  
Low Pressure ◽  
Pressure Flow
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