38417-97-9Relevant articles and documents
New Application of Crown Ether. V. The Effect of Crown Ethers on the Acid-Base Interaction between 2,4,4',6-tetranitrodiphenylamine and Primary Amines in Benzene
Wada, Fumio,Wada, Yoshiko,Kikukawa, Kiyoshi,Matsuda, Tsutomu
, p. 458 - 461 (1981)
The effect of crown ethers on the acid-base interaction of 2,4,4',6-tetranitrodiphenylamine (HA, λmax 380 nm, pKa = 8.88 in water) with primary amines (RNH2) in benzene was investigated spectrophotometrically.Crown ethers assisted strongly the formation of association complexes, RNH3+*crown ether*A-, which existed as a single chemical species (λmax 478 nm) assignable to "crown ether-separated ion pair".The effect of the steric factors of various primary amines on the equilibrium to form the association complex was discussed on the basis of the equilibrium constants and thermodynamic parameters of the systems involving 18-crown-6 and benzo-18-crown-6.
The activation of SNAr reactions by the superstrong electron-withdrawing substituent CF3S(O)=NSO2CF3
Boiko, V. N.,Kirii, N. V.,Yagupolskii, L. M.
, p. 119 - 124 (2007/10/03)
The chlorine lability of the 2-nitrochlorobenzene derivative which contains the superstrong electron-withdrawing substituent CF3S(O)=NSO2CF3 in position 4 has been compared with the analogous 4-trifluoromethylsulphonyl derivative and picryl chloride in nucleophilic substitution.During interaction with hard nucleophilic agents, the effect of one superstrong substituent approximately corresponds to the influence of two nitro groups in positions 2 and 4.With soft reagents, picryl chloride is more active than the compound containing the CF3S(O)=NSO2CF3 group, polarizable only with difficulty.
2,4,6-Trinitrodiphenylamines for control of foliar phytopathogens
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, (2008/06/13)
A class of 2,4,6-trinitrodiphenylamines, bearing one or more substituents on the ring which does not bear nitro groups, which substituents are chosen from among trfluoromethyl groups, nitro groups, and other simple substituents, are effective in the control of foliar phytopathogens.