scholarly journals ON THE DERIVATIVES OF ANTHRAHYDROQUINONE DISULPHURIC ACID ESTERS. I. SYNTHESIS OF SOME AZO-COMPOUNDS

1936 ◽  
Vol 11 (3) ◽  
pp. 201-204
Author(s):  
Kenji Iwamoto
Keyword(s):  
Azo Compounds ◽  
Derivatives Of ◽  
Acid Esters

ChemInform Abstract: Anionic Derivatives of Pentafluoro-λ6-sulfanyl (Fluorosulfonyl) Acetic Acid Esters.

ChemInform ◽  
2010 ◽  
Vol 25 (7) ◽  
pp. no-no
Author(s):  
R. WINTER ◽  
G. L. GARD ◽  
R. MEWS ◽  
M. NOLTEMEYER
Keyword(s):  
Acetic Acid ◽  
Derivatives Of ◽  
Acetic Acid Esters ◽  
Acid Esters

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.

Evaluation of Phosphoramide Derivatives of Carboxylic Acid Esters for the Alkylation of Tricarbonyliron Complexes With Weak Regiodirecting Groups

1994 ◽  
Vol 47 (8) ◽  
pp. 1605 ◽  
Author(s):  
GR Stephenson ◽  
K Milne
Keyword(s):  
Carboxylic Acid ◽  
Derivatives Of ◽  
Acid Esters

Enolates derived from phosphoramide derivatives of carboxylic acid esters were found to act as regiocontrolled nucleophiles for the alkylation of tricarbonyl (η5-cyclohexadienyl)iron(1+) salts, even in cases where weak (Me) regiodirecting groups were present as unsymmetrically placed substituents. The nucleophiles, however, lacked the correct degree of basicity needed for high-yielding reactions.

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