Nature of the reactions involving 4-haloisoquinolines and amide ion in ammonia. Remarkable competition between SRN1 substitution and .sigma. complex formation

1991 ◽  
Vol 56 (8) ◽  
pp. 2805-2809 ◽  
Author(s):  
John A. Zoltewicz ◽  
Terence M. Oestreich
Keyword(s):  
Complex Formation ◽  
Sigma Complex

Pressure effect on rate and equilibrium constants of reversible anionic .sigma.-complex formation between polynitroaromatics and lyate ions of water and methanol

1980 ◽  
Vol 102 (24) ◽  
pp. 7268-7272 ◽  
Author(s):  
Muneo Sasaki ◽  
Noboru Takisawa ◽  
Fujitsugu Amita ◽  
Jiro Osugi
Keyword(s):  
Complex Formation ◽  
Pressure Effect ◽  
Equilibrium Constants ◽  
Sigma Complex

Meisenheimer Complex Formation Between 1,3,5-Trinitrobenzene and Hydroxide Ion. Equilibrium Constants for the Dimethylformamide–Water Solvent System

1972 ◽  
Vol 50 (11) ◽  
pp. 1729-1733 ◽  
Author(s):  
E. A. Symons ◽  
E. Buncel
Keyword(s):  
Complex Formation ◽  
Aqueous Medium ◽  
Equilibrium Constant ◽  
Equilibrium Constants ◽  
Solvent System ◽  
Medium Composition ◽  
Hydroxide Ion ◽  
Spectrophotometric Methods ◽  
Water Solvent ◽  
Sigma Complex

Sigma-complex formation between 1,3,5-trinitrobenzene (TNB) and hydroxide ion has been studied quantitatively as a function of medium composition for part of the dimethylformamide (DMF)–water solvent system by spectrophotometric methods. Only a 1:1 complex is detected under the conditions of measurement, with [TNB] ≥ [OH−]. The equilibrium constant (Keq) for complex formation in 22 mol % DMF has the value 3 × 10−3 l mol−1, compared with 3 l mol−1 in purely aqueous medium. Further increases in Kcq occur as the DMF content of the medium is raised; in 50 mol % DMF Keq ≈ 105, but reliable Keq values could not be obtained in this region of medium composition. The increase in Keq with increasing DMF content is interpreted largely on the basis of hydroxide ion desolvation.

Mechanistic study of the reactions of 1,1-dimethylallene with nickel(0) complexes. The .pi.- and .sigma.-complex formation vs. electron transfer

1985 ◽  
Vol 4 (8) ◽  
pp. 1386-1395 ◽  
Author(s):  
Daniel J. Pasto ◽  
Nai Zhong. Huang
Keyword(s):  
Electron Transfer ◽  
Complex Formation ◽  
Mechanistic Study ◽  
Sigma Complex

ChemInform Abstract: SIGMA-COMPLEX FORMATION AND AROMATIC SUBSTITUTION WITH THIOLATES AND NITROARYL THIOETHERS

1973 ◽  
Vol 4 (49) ◽  
pp. no-no
Author(s):  
GINO BIGGI ◽  
FRANCESCO PIETRA
Keyword(s):  
Complex Formation ◽  
Aromatic Substitution ◽  
Sigma Complex

ChemInform Abstract: CATALYSIS BY TERTIARY AMINES OF SIGMA-COMPLEX FORMATION BETWEEN 1,3,5-TRINITROBENZENE AND ANILINE

1975 ◽  
Vol 6 (13) ◽  
pp. no-no
Author(s):  
E. BUNCEL ◽  
H. W. LEUNG
Keyword(s):  
Complex Formation ◽  
Tertiary Amines ◽  
Sigma Complex

.sigma. Complex formation involving ambident phenoxide ion

1973 ◽  
Vol 95 (25) ◽  
pp. 8470-8472 ◽  
Author(s):  
Erwin. Buncel ◽  
John G. K. Webb
Keyword(s):  
Complex Formation ◽  
Sigma Complex
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