77379-02-3Relevant articles and documents
Kinetics of snar reactions of 1-phenoxy-nitrobenzenes with aliphatic amines in toluene: Ring substituent and solvent effects on reaction pathways
Isanbor, Chukwuemeka,Babatunde, Alice Ibitola
experimental part, p. 1078 - 1085 (2010/07/13)
Rate constants are reported for the reactions of a series of 4-substituted-1-phenoxy-2,6-dinitrobenzenes 1 and 6-substituted-1-phenoxy-2,4- dinitrobenzenes 2 activated by CF3, COOCH3, CN, NO 2 groups or by ring-nitrogen wi
Amines as leaving groups in nucleophilic aromatic substitution reactions. Part 4. σ-adduct formation in the hydrolysis of 1-amino-2,4,6-trinitrobenzenes
Bujan, Elba I.,Remedi, M. Virginia,De Rossi, Rita H.
, p. 969 - 975 (2007/10/03)
The kinetic study of the reaction of 2,4,6-trinitro-1-pyrrolidinobenzene 3,2,4,6-trinitro-1-piperidinobenzene 1 and 1-morpholino-2,4,6-trinitrobenzene 2 was made in 1,4-dioxane-water mixtures at 25°C. In all cases, several processes were observed, the slowest of them leading to the formation of picrate ion. The fastest processes involved the formation of σ complexes by addition of one or two HO- to unsubstituted ring positions and the ionisation of the 1:1 complex. Besides, for compounds 1 and 3, cis-trans isomerisation of 1:2 complexes was kinetically detected. Substitution occurred by displacement of the amino group on the substrate and the 1:1 complex. The reaction pathway for the formation of phenol which involves the formation of these complexes has lower energy than that which results from addition to the 1 position of the substrate.
1,3-?-Adducts in the Reactions of 1-Dialkylamino-substituted 2,4,6-Trinitrobenzenes with Amines in Dimethyl Sulphoxide
Hasegawa, Yoshinori,Sekiguchi, Shizen
, p. 1201 - 1219 (2007/10/03)
The reactions of pyrrolidin-1-yl (1a), 1-piperidino (1b) and 1-dimethylamino-2,4,6-trinitrobenzene (1c) with n-butylamine, pyrrolidine and piperidine were conducted in dimethyl sulphoxide.Kinetic and equilibrium data were obtained for the formation of 1,3-?-adducts (4) (Scheme).The proton transfer between the zwitterionic intermediates (3) and the 1,3-?-adducts (4) is rapid for n-butylamine, whereas it is partially rate-limiting for pyrrolidine and rate-limiting for piperidine.For a given reactant, Kc and k3 decrease in the order pyrrolidine>piperidine>n-butylamine, and kAm//k-3 and kAmH+ decrease in the order pyrrolidine>piperidine.For a given amine, Kc, k3, kAm/k-3 and kAmH+ increase in the order 1a1b1c.These results are discussed from the standpoint of the structures of the reactants and the nucleophilic amines.