Pyrazine is a heterocyclic aromatic organic compound with the chemical formula C4H4N2. It is a symmetrical molecule with point group D2h. Pyrazine is less...

heterocyclic compound containing a ring complex made up of a benzene ring and a pyrazine ring. It is isomeric with other naphthyridines including quinazoline, phthalazine...

Alkylpyrazines are chemical compounds based on pyrazine with different substitution patterns. Some alkylpyrazines are naturally occurring highly aromatic...

also known as Grindstaff pyrazine) is a methoxypyrazine that is very similar to isopropyl methoxy pyrazine except that the alkyl side-group contains...

It is isomeric with two other diazine (C4H4N2) rings, pyrimidine and pyrazine. Pyridazines are rare in nature, possibly reflecting the scarcity of naturally...

ethylene glycol on ethylene diamine hydrochloride, or by reduction of pyrazine with sodium in ethanol. A form in which piperazine is commonly available...

flavour is most widely recognised, caused by pyrazines, which are more prevalent in under-ripened grapes. Pyrazine compounds are present in all Cabernet Sauvignon...

structural isomers: pyridazine (1,2-diazine) pyrimidine (1,3-diazine) pyrazine (1,4-diazine) 6-membered rings with one nitrogen atom: pyridines 6-membered...

This is also a naturally occurring compound in Sauvignon grapes, and so pyrazine taint has been known to make Rieslings taste like Sauvignon blanc.[citation...

highly odorous metabolites from an actinomycete: 2-Isopropyl-3-methoxy-pyrazine, methylisoborneol, and geosmin. Nancy N. Gerber, Journal of Chemical Ecology...

rings   Benzene Naphthalene Anthracene Pyridine Quinoline Isoquinoline Pyrazine Quinoxaline Acridine Pyrimidine Quinazoline Phenazine Pyridazine Cinnoline...

substituted pteridines that have diverse biological roles. Dihydrobiopterin Pyrazine Pyrimidine Tetrahydrobiopterin International Union of Pure and Applied...

axyridis, like other ladybeetles or ladybirds, uses isopropyl methoxy pyrazine as a defensive chemical to deter predation, and also carries this chemical...

nitrogen atoms at positions 1 and 3 in the ring.: 250  The other diazines are pyrazine (nitrogen atoms at the 1 and 4 positions) and pyridazine (nitrogen atoms...

with more than 9 rings, consider cephalostatin-1, a steroidic 13-ringed pyrazine with the empirical formula C54H74N2O10 isolated from the Indian Ocean hemichordate...

organic compound with the formula (C6H4)2N2. It is a dibenzo annulated pyrazine, and the parent substance of many dyestuffs, such as the toluylene red...

urinate on their food caches in order to identify them. Their urine contains pyrazine analogs that act as kairomones, repelling their prey. Dog communication...

by insects such as Harmonia axyridis which produces isopropyl methoxy pyrazine (IPMP). They have also been identified as additives in cigarette manufacture...

earthy flavour, but usually with more bitterness than arabica due to its pyrazine content. Since arabica beans are believed to have smoother taste with more...

depending on the location of the second N, pyridazine, pyrimidine, or pyrazine. Four chemical processes contribute to industrial benzene production: catalytic...

Basic aromatic ring systems Pyridine Quinoline Isoquinoline Acridine Pyrazine Quinoxaline Imidazole Benzimidazole Purine Pyrazole Indazole Pyrimidine Quinazoline...

chocolate had higher levels of Strecker aldehydes, and lower levels of pyrazines. The dried beans are then transported to a chocolate manufacturing facility...

nitration of cis-syn-cis-2,6-dioxodecahydro-1H,5H-diimidazo[4,5-b:4',5'-e]pyrazine". The Journal of Organic Chemistry. 56 (10): 3413–3419. doi:10.1021/jo00010a043...

cuminaldehyde. Other aroma compounds of toasted cumin are the substituted pyrazines, 2-ethoxy-3-isopropylpyrazine, 2-methoxy-3-sec-butylpyrazine, and...

The most odorous chemicals in cigar smoke are pyridines. Along with pyrazines, they are also the most odorous chemicals in cigar smokers' breath. These...

hydroxide and 2,3,5-Trimethyl-5,6-dihydro-pyrazine is 3:1, the mass ratio of ethanol to 2,3,5-trimethyl-5,6-dihydro-pyrazine 10:1,reaction temperature 68 °C, reaction...

diazine heterocycles (C4H4N2), with the names pyridazine, pyrimidine, and pyrazine. Impure pyridine was undoubtedly prepared by early alchemists by heating...

receptor class. The urine of canids, such as wolves, contains sulfur-bearing pyrazine analogues that have been identified as kairomones. These interspecific...

harvested. Many of the phenolic compounds and aroma compounds, such as pyrazine, that contribute to strong grassy flavours are found in the grape skins...

mashing process, particularly through formation of 2-furanmethanol and pyrazines imparting nutty or cereal characteristics contributes to the baked bread...