Radiolytic and photolytic production and decay of radicals in adamantane and solutions of 2-methyltetrahydrofuran, 2-methyltetrahydrothiophene, and tetrahydrothiophene in adamantane. Conformation equilibrium of the 2-methyltetrahydrothiophene radical

1976 ◽  
Vol 80 (13) ◽  
pp. 1435-1445 ◽  
Author(s):  
G. Charles Dismukes ◽  
John E. Willard
Keyword(s):  
Conformation Equilibrium ◽  
Decay Of Radicals

Réactivité nucléophile des cyclanones: influence de la stéréochimie cis/trans en série bicyclique

1982 ◽  
Vol 60 (18) ◽  
pp. 2355-2357 ◽  
Author(s):  
C. Agami ◽  
T. Rizk ◽  
R. Durand ◽  
P. Geneste
Keyword(s):  
Trans Isomer ◽  
Rate Constants ◽  
Nucleophilic Addition ◽  
Acidic Medium ◽  
Conformation Equilibrium ◽  
Bicyclic Ketones

The relative reactivities of a number of cis/trans pairs of bicyclic ketones in the 1- and 2-decalone series (2-decalone; 10-methyl-2-decalone; 9-methyl-1-decalone; and 3,10-dimethyl-2-decalone) have been studied for the nucleophilic addition of hydroxylamine in acidic medium. The results obtained as well as the rate constants for neutral or acid catalysed addition always reveal a slight preference for the trans-isomer (× 2.4). This result agrees with the proposal that preferential equatorial attack of a nucleophile is caused by conformational factors related to a steroid [Formula: see text] non-steroid conformation equilibrium in the cis-isomers. [Journal Translation]

Conformation Equilibrium of 1,2-Dichloroethane as a Probe for Solvent Properties of Liquid and Supercritical CO2

2007 ◽  
Vol 36 (9) ◽  
pp. 1126-1127 ◽  
Author(s):  
Mariko Tono-oka ◽  
Hideyuki Nakayama ◽  
Kikujiro Ishii
Keyword(s):  
Supercritical Co2 ◽  
Conformation Equilibrium ◽  
Solvent Properties

scholarly journals Analysis of Decay of Radicals Induced in Irradiated Foods During Long Storage

2013 ◽  
Vol 48 (1) ◽  
pp. 11-18
Author(s):  
Keigo Kishita ◽  
Shoei Kawamura ◽  
Hideo Nakamura ◽  
Masahiro Kikuchi ◽  
Yasuhiko Kobayashi ◽  
...  
Keyword(s):  
Irradiated Foods ◽  
Decay Of Radicals ◽  
Long Storage

6-Amino-2,6-dideoxy- or -2,3,6-trideoxyhexono-1,6-lactams: Synthesis and Conformation

2004 ◽  
Vol 69 (4) ◽  
pp. 867-884 ◽  
Author(s):  
Michaela Hamerníková ◽  
Jaroslav Havlíček ◽  
Romana Bláhová ◽  
Helena Pospíšilová ◽  
Hana Votavová ◽  
...  
Keyword(s):  
Low Temperature ◽  
Nmr Spectra ◽  
Ring Conformation ◽  
Water Solutions ◽  
Conformation Equilibrium ◽  
Lactam Ring ◽  
C Nmr

6-Amino-2,6-dideoxy-D-ribo-hexono-1,6-lactam (1a), 6-amino-2,6-dideoxy-D-arabino-hexono-1,6-lactam (2a), 6-amino-2,3,6-trideoxy-L-threo-hexono-1,6-lactam (3a) and per-O-acetyl derivatives 1b-3b were synthesized and their seven-membered lactam ring conformation was studied. 1H and 13C NMR spectra of the named lactams, measured at low temperature, always disclosed the presence of both 1,NC4 and 4C1,N conformations in ratios which were affected mainly by the stereochemistry of cyclohexane. There were no CD extremes over 200 nm found in water solutions of the lactams 1a and 2a, probably owing to the symmetry of the C2-C6 parts of their seven-membered rings. These results contrast with those previously found for the lactams having OH or OAc at C2, and support a concept of the directive role of the C2 substituent in conformation equilibrium.

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