pyrone


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pyrone

(ˈpaɪrəʊn; paɪˈrəʊn)
n
1. (Elements & Compounds) either of two heterocyclic compounds that have a ring containing five carbon atoms and one oxygen atom with two double bonds and a second oxygen atom attached to a carbon atom in either the ortho-position (alpha pyrone) or the para-position (gamma pyrone)
2. (Elements & Compounds) any one of a class of compounds that are substituted derivatives of a pyrone
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References in periodicals archive ?
Coumarins are a group of aromatic benzopyrones consisting of fused benzene and alpha pyrone rings.
Kava contains kavalactones, pipermethysticine and pyrone; these make it antimicrobial, antiseptic, stimulant, analgesic, antispasmodic, nervine and tonic.
Kojic acid is a natural pyrone produced from fungal fermentation from various types of carbon substrates in the presence of fungi [1, 2].
Kojic acid [21, 22], a natural pyrone which carries one C=O and two OH groups, is envisaged to have similar properties of natural anthocyanins dyes for its ability to bind with Ti[O.sub.2].
Flavonoids comprise approximately 6,000 compounds that are characterized and are distinguished from other aromatic compounds by having a common phenylchromanone structure (C6-C3-C6) consisting of two benzene aromatic rings (A and B rings) linked by three carbons that are usually in an oxygenated central pyrone ring (C ring) [11-13].
Meanwhile, Qura-tul-Ain D/o Mohammad Mansha got degree in the subject of Chemistry after approval of her thesis titled "Synthetic Studies of Condensed Pyrone Derivatives".
(2013) also reported that pyrone polyketides found in the cone snail Conus rolani are synthesized by bacteria.
Presence of surface functional groups such as carboxyl, lactone, phenol, carbonyl, ether, pyrone and chromene gives activated carbon an acid-base character (Rodriguez-Reinoso and Molina-Sabio, 1998).
Synthesis of the desired pyrone was accomplished utilizing a Jacobsen asymmetric hetero-Diels-Alder reaction between Danishefsky's diene and an optically pure aldehyde prepared in two steps from chiral pool.
Complex IR [cm.sup.1] (s = sharp; number b = broad; d = doublet; w = weak; vw = very weak) vC-O M-O, M-N, or M-Cl phenolic 1 BHDH-L5 (c) 1260 (s) -- 2 [[Cr(BHDH)Cl].sub.2] 1300-1310 (d) 550 (w), 435, 310, 295 (w) 3 [VO(BHDH)([H.sub.2]O)] 1270 (s) 970 (V=O), 820 (s), 520, 470, 440, 340 (a) Inter and intramolecular hydrogen bonding; (b) The breakage of hydrogen bonding and the deprotonation of both the hydroxyl groups (phenolic), that is, hydrazide -OH and pyrone -OH and their M-O coordination; (c) No shift of lactone vC=O at 1710 (s) [cm.sup.-1]; and vC-O-C at 1010 (s) [cm.sup.-1] suggests noninvolvement in complex formation; shift of hydrazide, phenolic vC-O and vC=N indicate participation in complexation.
Variation in pyrone production, lytic enzymes and control of Rhizoctonia root rot of wheat among single-spore isolates of Trichoderma koningii.
Ringe, "Observation of the light-triggered binding of pyrone to chymotrypsin by Laue X-ray crystallography," Proceedings of the National Academy of Sciences of the United States of America, vol.