Month: November 2022

On December 31, 1989, Huang, Tzou Chi; Bruechert, Linda J.; Ho, Chi Tang published an article.Formula: C8H10N2 The title of the article was Kinetics of pyrazine formation in amino acid-glucose systems. And the article contained the following:

The chem. and kinetics of pyrazine formation were studied in 4 amino acid-glucose model systems. Different amounts of the same alkylpyrazines were produced in the 4 systems. The most abundant alkylpyrazine generated in a glycine-glucose system was 2,3,5-trimethylpyrazine, while 2-methylpyrazine was most abundant in an arginine-glucose system and 2,5-dimethylpyrazine predominated in a histidine-glucose system. 2-Methylpyrazine and 2,5-dimethylpyrazine were the 2 most abundant alkylpyrazines in a lysine-glucose system. Kinetic data from the arginine-glucose system indicated that each of 4 selected pyrazines was formed by a pseudo-zero-order reaction. Activation energies in the same system were 19.5 ± 4.1 kcal/mol for pyrazine, 24.8 ± 8.7 for 2-methylpyrazine, 20.8 ± 4.7 for 2,6-dimethylpyrazine and 29.0 ± 3.8 for 2-methyl-6,7-dihydro-5H-cyclopentapyrazine. The experimental process involved the reaction of 5,6,7,8-Tetrahydroquinoxaline(cas: 34413-35-9).Formula: C8H10N2

The Article related to pyrazine formation kinetics maillard reaction, alkylpyrazine formation kinetics maillard reaction, amino acid glucose maillard reaction pyrazine, Food and Feed Chemistry: Physical, Organic, and Inorganic Chemistry and Model Systems and other aspects.Formula: C8H10N2

Referemce:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Baltes, Werner; Knoch, Eberhard published an article in 1993, the title of the article was Model reactions on roast aroma formation. XIII. The formation of some uncommon N-heterocyclic compounds and furans after roasting of tryptophan with reducing sugars and sugar degradation products.COA of Formula: C8H10N2 And the article contains the following content:

After treatment of D-glucose and D-xylose with tryptophan under the conditions of coffee roasting, 311 volatile compounds were identified. Among others, quinolines, quinoxalines and carbazoles were formed. Their formation is assumed to proceed via alkylated indoles by ring enlargement reactions of intramol. cyclizations. Another group of compounds formed are bicyclic furans, furfurylamines and N-2-furfuryl-pyrroles, the mass spectra of which are listed. The pathway of tryptophan degradation, as well as the formation of the described products, is discussed. The experimental process involved the reaction of 5,6,7,8-Tetrahydroquinoxaline(cas: 34413-35-9).COA of Formula: C8H10N2

The Article related to coffee roast aroma compound model, tryptophan reducing sugar roasting aroma compound, furan aroma coffee roasting model, heterocycle aroma coffee roasting model, Food and Feed Chemistry: Physical, Organic, and Inorganic Chemistry and Model Systems and other aspects.COA of Formula: C8H10N2

Referemce:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

On March 31, 1984, McNab, Hamish published an article.Electric Literature of 62163-09-1 The title of the article was The thermolysis of polyazapentadienes. Part 4. Formation of indoles and quinoxalines from 5-(2,6-disubstituted phenyl)-1,2,5-triazapentadienes and related compounds. And the article contained the following:

7-Methylindole and 5-substituted quinoxalines are the main cyclized products from the gas-phase thermolysis of PhNHN:CRCH:NC6H3Me2-2,6 (R = H, Me) and MeON:CHCMe:NC6H3Me2-2,6. Both heterocyclic systems arise by competitive decomposition of a spirodienyl radical intermediate, the indole by loss of MeCN and an H atom, and the quinoxalines by loss of Me•. The experimental process involved the reaction of 5-Chloroquinoxaline(cas: 62163-09-1).Electric Literature of 62163-09-1

The Article related to pyrolysis cyclization aryltriazapentadiene mechanism, triazapentadiene aryl pyrolysis cyclization mechanism, quinoxaline, methylindole, indole methyl, Physical Organic Chemistry: Degradation Reactions, Including Mass Spectral Fragmentation and other aspects.Electric Literature of 62163-09-1

Referemce:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider