Matches in SemOpenAlex for { <https://semopenalex.org/work/W1968221736> ?p ?o ?g. }
Showing items 1 to 70 of
70
with 100 items per page.
- W1968221736 endingPage "189" @default.
- W1968221736 startingPage "189" @default.
- W1968221736 abstract "Abstract The catalytic effects of organic bases in reactions of arylamines with arylsulphonic acid derivatives, ArSO2X (X = Cl, Br, OSO2Ar) in aprotic media are characterised by the following regularities. 1. The activity of 3- and 4-substituted pyridines, N-alkyl- and N-phenylimidazoles is desribed by the common Bränsted relationship. Substituents in positions 2 and 2,6 of the pyridine molecule have a strong steric influence. Tertiary cyclic amines of quinuclidine type with the same basicity as pyridines and imidazoles have more higher activity than the latter. N-Oxides of pyridine which are 4–5 pKa units less basic than the corresponding pyridines have the catalytic activity 100 times as much, as compared with them. 2. The intensity of the catalytic action of pyridines and their N-oxides alters insignificantly with changing the leaving group X in the substrate, somewhat increasing in the order Cl < Br≤OSO2Ar. 3. The activity of pyridine bases increases with increasing the solvent solvating ability. The inhibiting influence of the X− anione on the rate of catalytic reaction displays in media of high polarity (nitrobenzene, acetonitrile). These regularities are explained in terms of the nucleophilic mechanism of catalysis which is supported by isolating intermediate adducts of tertiary amines (in particular 4-N,N-dimethylaminopyridine) with arylsulphonic acid bromides and anhydrides and by studies of their reactivity towards arylamines in methylene chloride. Compounds of bifunctional nature (carboxylic acids) do not accelerate the reaction under consideration unlike a similar substitution process at the carbonyl C-atom. The cause of this seems to be a different geometry of transition states in substitution at the sulpho group S-atom and at the carbonyl carbon, respectively." @default.
- W1968221736 created "2016-06-24" @default.
- W1968221736 creator A5018812241 @default.
- W1968221736 creator A5026402854 @default.
- W1968221736 creator A5035657672 @default.
- W1968221736 creator A5045889591 @default.
- W1968221736 creator A5046948469 @default.
- W1968221736 creator A5077364233 @default.
- W1968221736 date "1979-03-01" @default.
- W1968221736 modified "2023-09-26" @default.
- W1968221736 title "CATALYTIC EFFECTS IN THE AMINOLYSIS REACTIONS OF ARYLSULPHONIC ACID DERIVATIVES IN NON-AQUEOUS MEDIA" @default.
- W1968221736 doi "https://doi.org/10.1080/03086647908080368" @default.
- W1968221736 hasPublicationYear "1979" @default.
- W1968221736 type Work @default.
- W1968221736 sameAs 1968221736 @default.
- W1968221736 citedByCount "0" @default.
- W1968221736 crossrefType "journal-article" @default.
- W1968221736 hasAuthorship W1968221736A5018812241 @default.
- W1968221736 hasAuthorship W1968221736A5026402854 @default.
- W1968221736 hasAuthorship W1968221736A5035657672 @default.
- W1968221736 hasAuthorship W1968221736A5045889591 @default.
- W1968221736 hasAuthorship W1968221736A5046948469 @default.
- W1968221736 hasAuthorship W1968221736A5077364233 @default.
- W1968221736 hasConcept C142724271 @default.
- W1968221736 hasConcept C155647269 @default.
- W1968221736 hasConcept C161790260 @default.
- W1968221736 hasConcept C178790620 @default.
- W1968221736 hasConcept C178907741 @default.
- W1968221736 hasConcept C185592680 @default.
- W1968221736 hasConcept C201194858 @default.
- W1968221736 hasConcept C204787440 @default.
- W1968221736 hasConcept C2776910235 @default.
- W1968221736 hasConcept C2777998946 @default.
- W1968221736 hasConcept C2779485729 @default.
- W1968221736 hasConcept C2780443040 @default.
- W1968221736 hasConcept C71924100 @default.
- W1968221736 hasConceptScore W1968221736C142724271 @default.
- W1968221736 hasConceptScore W1968221736C155647269 @default.
- W1968221736 hasConceptScore W1968221736C161790260 @default.
- W1968221736 hasConceptScore W1968221736C178790620 @default.
- W1968221736 hasConceptScore W1968221736C178907741 @default.
- W1968221736 hasConceptScore W1968221736C185592680 @default.
- W1968221736 hasConceptScore W1968221736C201194858 @default.
- W1968221736 hasConceptScore W1968221736C204787440 @default.
- W1968221736 hasConceptScore W1968221736C2776910235 @default.
- W1968221736 hasConceptScore W1968221736C2777998946 @default.
- W1968221736 hasConceptScore W1968221736C2779485729 @default.
- W1968221736 hasConceptScore W1968221736C2780443040 @default.
- W1968221736 hasConceptScore W1968221736C71924100 @default.
- W1968221736 hasIssue "1-2" @default.
- W1968221736 hasLocation W19682217361 @default.
- W1968221736 hasOpenAccess W1968221736 @default.
- W1968221736 hasPrimaryLocation W19682217361 @default.
- W1968221736 hasRelatedWork W1968089880 @default.
- W1968221736 hasRelatedWork W2077836100 @default.
- W1968221736 hasRelatedWork W2163243198 @default.
- W1968221736 hasRelatedWork W2285776325 @default.
- W1968221736 hasRelatedWork W2395122550 @default.
- W1968221736 hasRelatedWork W2501043763 @default.
- W1968221736 hasRelatedWork W2950470046 @default.
- W1968221736 hasRelatedWork W2950759831 @default.
- W1968221736 hasRelatedWork W3204390097 @default.
- W1968221736 hasRelatedWork W4246348712 @default.
- W1968221736 hasVolume "6" @default.
- W1968221736 isParatext "false" @default.
- W1968221736 isRetracted "false" @default.
- W1968221736 magId "1968221736" @default.
- W1968221736 workType "article" @default.