Synthesis of Hallachrome

1999 ◽  
Vol 52 (9) ◽  
pp. 833 ◽  
Author(s):  
Donald W. Cameron ◽  
D. Ross Coller ◽  
Clinton A. McDonald
Keyword(s):  
Naturally Occurring ◽  
Synthetic Intermediates ◽  
Derivatives Of

Hallachrome (1), the only known example of a naturally occurring 1,2-anthraquinone, has been synthesized by successive cycloadditions involving the dienophile (8) with the dienes (7) and (12). Synthetic intermediates (18) and (6) are known derivatives of natural hallachrome.

scholarly journals Synthesis and Olfactory Characteristics of Hydroxyether Derivatives of Methyl Eugenol

2020 ◽  
Vol 24 (9) ◽  
pp. 1503-1507
Author(s):  
S.O. Okopi ◽  
L.M. Affiku
Keyword(s):  
Double Bond ◽  
Essential Oils ◽  
Plant Species ◽  
Chemical Transformation ◽  
Structural Modification ◽  
Methyl Eugenol ◽  
Naturally Occurring ◽  
Relationship Of ◽  
Derivatives Of ◽  
Functional Alteration

Methyl eugenol is a naturally occurring substance found in the essential oils of several plant species. It is a cheap and abundant material with a rather limited interest as perfuming ingredient. This research investigated the structure-odour relationship of methyl eugenol and its derivatives, focusing on the chemical transformation of the double bond to hydroxyether derivatives in a controlled manner. Two derivatives 2-(4-ethyl- 3-methoxybenzyl)oxirane (68.8% yield) and 1-(3,4-dimethoxyphenyl)-3-ethoxypropan-2-ol (63.58% yield), were synthesized from methyl eugenol. This research found that the odour characteristic of 2-(4-ethyl-3-methoxybenzyl)oxirane[floral, fresh, slight lime and sweet]compounds, is clearly different from the odours of the 1-(3,4-dimethoxyphenyl)-3-ethoxypropan-2-ol [Glue-like, pungent, and Caramel-like]. It is evident from our observations that double bond substitution and functional alteration of the methyl eugenol modifies the perceived odour of methyl eugenol  derivative. Thus, structural modification overall led to an increase in odour potency. Keywords: Fragrance, Methly-Eugenol, Ether, Olfactory characteristic, Epoxidation.

scholarly journals Insight into the Presence of Stilbenes in Medicinal Plants Traditionally Used in Croatian Folk Medicine

2016 ◽  
Vol 11 (6) ◽  
pp. 1934578X1601100 ◽  
Author(s):  
Ivana Generalić Mekinić ◽  
Danijela Skroza ◽  
Ivica Ljubenkov ◽  
Višnja Katalinić
Keyword(s):  
Biological Activity ◽  
Medicinal Plants ◽  
Biological Activities ◽  
Folk Medicine ◽  
Free Form ◽  
Naturally Occurring ◽  
Derivatives Of ◽  
Insight Into ◽  
Phenolic Extracts

Over the last years, great interest has arisen concerning plant stilbenes, especially resveratrol, which has a whole spectrum of positive biological activities. In this study, we investigated the presence of resveratrol monomers (trans- and cis- form) and naturally occurring derivatives of fraas-resveratrol (piceid, astringin and isorhapontin) in phenolic extracts of twenty medicinal plants traditionally used in Croatian folk medicine. The investigated compounds were present in the samples, in free form or as glucosides, and the highest share was found in immortelle, common yarrow and Lamiaceae plants. The obtained results indicate that biological activity of selected medicinal plants can be related to the presence of this valuable group of phytochemicals.

scholarly journals Structural and Solubility Parameter Correlations of Gelation Abilities for Dihydroxylated Derivatives of Long-Chain, Naturally Occurring Fatty Acids

2015 ◽  
Vol 21 (23) ◽  
pp. 8530-8543 ◽  
Author(s):  
Mohan Zhang ◽  
Sermadurai Selvakumar ◽  
Xinran Zhang ◽  
Mukund P. Sibi ◽  
Richard G. Weiss
Keyword(s):  
Fatty Acids ◽  
Solubility Parameter ◽  
Naturally Occurring ◽  
Derivatives Of ◽  
Long Chain

Hydroxycinnamoyl: Coenzyme A Transferase Involved in the Biosynthesis of Kaempferol-3-(p-coumaroyl Triglucoside) in Pisum sativum

1977 ◽  
Vol 32 (9-10) ◽  
pp. 765-768 ◽  
Author(s):  
Marie H. Saylor ◽  
Richard L. Mansell
Keyword(s):  
Coenzyme A ◽  
Chemical Properties ◽  
Acyl Donor ◽  
Coumaric Acid ◽  
Enzyme Preparations ◽  
Naturally Occurring ◽  
Enzymatic Formation ◽  
Derivatives Of ◽  
Acid Esters ◽  
And Chemical Properties

Abstract The major flavonoids of Pisum are derivatives of kaempferol and quercetin, including both tri-glucosides and acylated triglucosides in which the acyl group is p-coumaric acid. Although hydroxy-cinnamic acid esters of flavonoids are common pigments in many plants, neither the enzymes nor the precursors involved in their biosynthesis have been demonstrated. We report here that crude enzyme preparations extracted from peas catalyze the transfer of the p-coumaroyl moiety of p-coumaroyl: Coenzyme A to kaempferol-3-triglucoside forming kaempferol-3-(p-coumaroyl triglucoside) as the acylated product. The reaction product has been vigorously shown to be identical to the naturally occurring kaempferol-3-(p-coumaroyl triglucoside) in both chromatographic and chemical properties. The enzymatic formation of the acylated derivative occurred only minimally when incubated with the cofactors required for carboxyl group activation (ligase) and maximally when incubated with p-coumaroyl : Coenzyme A as the acyl donor.

Nutritional stability of various naturally occurring monoglutamate derivatives of folic acid

1975 ◽  
Vol 28 (5) ◽  
pp. 438-444 ◽  
Author(s):  
J D O’Broin ◽  
I J Temperley ◽  
J P Brown ◽  
J M Scott
Keyword(s):  
Folic Acid ◽  
Naturally Occurring ◽  
Derivatives Of
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