Acidity functions of hydrochloric acid, perchloric acid, and sulfuric acid and pKa values of some primary aromatic amines in 50% volume/volume aqueous ethanol

1977 ◽  
Vol 42 (1) ◽  
pp. 162-165 ◽  
Author(s):  
William N. White ◽  
Thomas Vogelmann ◽  
Michael Morse ◽  
Hilda S. White
Keyword(s):  
Sulfuric Acid ◽  
Hydrochloric Acid ◽  
Perchloric Acid ◽  
Aromatic Amines ◽  
Aqueous Ethanol ◽  
Pka Values ◽  
Primary Aromatic Amines ◽  
Acidity Functions

A Critical Test of the Hammett Acidity Function

1972 ◽  
Vol 50 (4) ◽  
pp. 581-583 ◽  
Author(s):  
Keith Yates ◽  
Stanley A. Shapiro
Keyword(s):  
Sulfuric Acid ◽  
Aromatic Amines ◽  
Acidity Function ◽  
Experimental Uncertainty ◽  
Critical Test ◽  
Hammett Acidity Function ◽  
Primary Aromatic Amines

The applicability of the H0 acidity function to primary aromatic amines in general has been tested by using a set of five aniline indicators bearing no nitro-substituents. Up to 45% sulfuric acid the scale generated by these bases is the same (within experimental uncertainty) as that based entirely on nitro-anilines.

Bufadienolides. 17. Synthesis of 14α- and 14β-Artebufogenin

1973 ◽  
Vol 51 (12) ◽  
pp. 1973-1976 ◽  
Author(s):  
Yoshiaki Kamano ◽  
George R. Pettit
Keyword(s):  
Sulfuric Acid ◽  
Hydrochloric Acid ◽  
Perchloric Acid ◽  
Boron Trifluoride ◽  
Periodic Acid ◽  
Boron Trifluoride Etherate ◽  
Similar Reaction ◽  
Analogous Reaction ◽  
Dihydroxy Derivative

Treatment of resibufogenin (1a) or its acetate (1b) with perchloric acid or hydrochloric acid gave 14α-and 14β-artebufogenin (5a and 6a, or 5b and 6b), in addition to 15α-hydroxy-bufalin (4a or b). Reaction of epoxide 1b with chloranil or boron trifluoride etherate easily afforded 14α- and 14β-artebufogenin acetate (5b and 6b) in good yields. Analogous reaction of the isomeric 3β-hydroxy-14α,15α-epoxide 3a with perchloric acid, hydrochloric acid, or sulfuric acid again led to 14α- and 14β-artebufogenin (5a and 6a) and the 14β,15α-dihydroxy-derivative 4a, Similar reaction with periodic acid gave 6a and 4a.

ChemInform Abstract: STUDY OF THE CYCLIZATION OF PRIMARY AROMATIC AMINES WITH FORMALDEHYDE AND DIMEDONE IN THE PRESENCE OF PERCHLORIC ACID

1982 ◽  
Vol 13 (46) ◽  
Author(s):  
M. V. MEL'NIK ◽  
M. YA. KORNIKOV ◽  
A. V. TUROV ◽  
B. M. GUTSULYAK
Keyword(s):  
Perchloric Acid ◽  
Aromatic Amines ◽  
Primary Aromatic Amines

Three Hydrolysis Methods for 17-Ketosteroid Sulfates Compared by Colorimetric and Gas—Liquid Chromatographic Analyses

1970 ◽  
Vol 16 (3) ◽  
pp. 158-160 ◽  
Author(s):  
C A Muehlbaecher ◽  
E K Smith
Keyword(s):  
Gas Chromatography ◽  
Sulfuric Acid ◽  
Hydrochloric Acid ◽  
Ethyl Acetate ◽  
Perchloric Acid ◽  
Radioactivity Measurement ◽  
Liquid Chromatographic

Abstract Three methods for cleavage of 17-ketosteroid sulfates were evaluated for their acceptability in the preparation of urine extracts for gas chromatography. Recovery after hydrolysis with hot hydrochloric acid was unacceptably low, but solvolysis with ethyl acetate—sulfuric acid or tetrahydrofuran—perchloric acid was equally efficient and satisfactory. The results obtained by four techniques were intercompared: radioactivity measurement, Zimmermann- or Allen-chromogen development, and gas chromatography.

Determination of migration of 25 primary aromatic amines from food contact plastic materials by gas chromatographymass spectrometry

2013 ◽  
Vol 31 (1) ◽  
pp. 46 ◽  
Author(s):  
Ying LI ◽  
Chengfa LI ◽  
Daoqing XIAO ◽  
Feng LIANG ◽  
Zhinan CHEN ◽  
...  
Keyword(s):  
Aromatic Amines ◽  
Food Contact ◽  
Plastic Materials ◽  
Primary Aromatic Amines

Catalyst- and solvent-free Csp2-H functionalization of 4-hydroxycoumarins via C-3 dehydrogenative aza-coupling under ball-milling

2021 ◽  
Author(s):  
Goutam Brahmachari ◽  
Indrajit Karmakar ◽  
Pintu Karmakar
Keyword(s):  
Ball Milling ◽  
Aromatic Amines ◽  
Solvent Free ◽  
One Pot ◽  
Biologically Relevant ◽  
Tert Butyl ◽  
Three Component Reaction ◽  
Primary Aromatic Amines

A one-pot procedure for the synthesis of biologically relevant coumarin-hydrazones by a three-component reaction between 4-hydrocoumarins, primary aromatic amines and tert-butyl nitrite under ball-milling in the absence of any catalyst/additive...

scholarly journals Synthesis of Organic Ligands via Reactions of 4-Benzoyl-5-phenylamino-2,3-dihydrothiophene-2,3-dione with N-Nucleophiles

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Hassan Kabirifard ◽  
Pardis Hafez Taghva ◽  
Hossein Teimouri ◽  
Niloofar Koosheshi ◽  
Parastoo Javadpour ◽  
...  
Keyword(s):  
High Temperature ◽  
Carbonyl Group ◽  
Aromatic Amines ◽  
Room Temperature ◽  
Organic Ligands ◽  
Carboxyl Group ◽  
Primary Aromatic Amines

The reaction of 4-benzoyl-5-phenylamino-2,3-dihydrothiophene-2,3-dione (1) with aminoheteroaryls, lamotrigine, 1,3-diaminoheteroaryls, dapsone, NH2R (hydroxylamine, DL-1-phenylethylamine, and metformin), and 4,4′-bipyridine in THF/H2O (1 : 1) at room temperature led to 3-N-phenylthiocarbamoyl-2-butenamides 2–5, while that with naphthylamines and 1,3-phenylenediamine in ethanol at high temperature led to 5-phenylamino-2,5-dihydrothiophene-2-ones 6–8 as organic ligands in the medium to good yields. These showed the nucleophilic attacks of N-nucleophiles, except primary aromatic amines, on thioester carboxyl group (C-2) of thiophene-2,3-dione ring 1. However, the nucleophilic attacks of primary aromatic amines on the carbonyl group (C-3) of thiophene-2,3-dione 1 occurred in the form of substituted thiophenes.

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