Amiaspochalasins A–H, Undescribed Aspochalasins with a C-21 Ester Carbonyl from Aspergillus micronesiensis

2019 ◽  
Vol 84 (9) ◽  
pp. 5483-5491 ◽  
Author(s):  
Zhaodi Wu ◽  
Xiaotian Zhang ◽  
Weaam Hasan Al Anbari ◽  
Mi Zhang ◽  
Xia Chen ◽  
...  
Keyword(s):  
Ester Carbonyl

The antioxidant methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate

2014 ◽  
Vol 70 (11) ◽  
pp. 1050-1053 ◽  
Author(s):  
Xiang Li ◽  
Zhi-Gang Wang ◽  
Hou-He Chen ◽  
Sheng-Gao Liu
Keyword(s):  
Hydrogen Bonding ◽  
Dimethyl Sulfoxide ◽  
Methyl Acrylate ◽  
Title Compound ◽  
Intermolecular Hydrogen Bonding ◽  
Tert Butyl ◽  
Ester Carbonyl ◽  
Compound C ◽  
Steric Crowding

The title compound, C18H28O3, was prepared by the reaction of 2,6-di-tert-butylphenol with methyl acrylate under basic conditions using dimethyl sulfoxide as the promoter. The structure of this antioxidant indicates significant strain between theortho tert-butyl substituents and the phenolic OH group. In spite of the steric crowding of the OH group, it participates in intermolecular hydrogen bonding with the ester carbonyl O atom.

ChemInform Abstract: Addition of a Methylene Group Across the Ester Carbonyl Function.

ChemInform ◽  
1987 ◽  
Vol 18 (52) ◽  
Author(s):  
G. VERARDO ◽  
P. STRAZZOLINI ◽  
A. G. GIUMANINI
Keyword(s):  
Ester Carbonyl ◽  
Methylene Group ◽  
Carbonyl Function

Addition of a methylene group across the ester carbonyl function

1987 ◽  
Vol 28 (26) ◽  
pp. 3011-3012 ◽  
Author(s):  
Giancarlo Verardo ◽  
Paolo Strazzolini ◽  
Angelo G. Giumanini
Keyword(s):  
Ester Carbonyl ◽  
Methylene Group ◽  
Carbonyl Function

THE INFRARED SPECTRA OF MALONATE ESTERS

1958 ◽  
Vol 36 (1) ◽  
pp. 151-158 ◽  
Author(s):  
R. A. Abramovitch
Keyword(s):  
Infrared Spectra ◽  
Ester Carbonyl

The infrared spectra of a number of malonate esters have been examined. Most of them exhibit two ester carbonyl stretching bands which have been shown not to be due to enolization and conjugate chelation or to association. The influence of α-substituents is discussed, as well as the reason for the splitting of the band.

Unprecedented 1,3-dipolar cycloaddition of azomethine ylides to ester carbonyl

2002 ◽  
pp. 1628-1630 ◽  
Author(s):  
Mikhail S. Novikov ◽  
Igor V. Voznyi ◽  
Alexander F. Khlebnikov ◽  
Jürgen Kopf ◽  
Rafael R. Kostikov
Keyword(s):  
Azomethine Ylides ◽  
Dipolar Cycloaddition ◽  
Ester Carbonyl

Oxiranes from methylenation of the ester carbonyl group by diazomethane

1988 ◽  
Vol 53 (14) ◽  
pp. 3321-3325 ◽  
Author(s):  
Paolo Strazzolini ◽  
Giancarlo Verardo ◽  
Angelo G. Giumanini
Keyword(s):  
Carbonyl Group ◽  
Ester Carbonyl ◽  
Ester Carbonyl Group

scholarly journals Streptomyces K15 active-site serine dd-transpeptidase: specificity profile for peptide, thiol ester and ester carbonyl donors and pathways of the transfer reactions

1995 ◽  
Vol 307 (2) ◽  
pp. 335-339 ◽  
Author(s):  
J Grandchamps ◽  
M Nguyen-Distèche ◽  
C Damblon ◽  
J M Frère ◽  
J M Ghuysen
Keyword(s):  
Active Site ◽  
Kinetic Data ◽  
Transfer Reactions ◽  
Ester Bond ◽  
Penicillin Binding Protein ◽  
Thiol Ester ◽  
Ester Carbonyl ◽  
Simple Alternative ◽  
Scissile Bond ◽  
Enzyme Intermediate

The Streptomyces K15 transferase is a penicillin-binding protein presumed to be involved in bacterial wall peptidoglycan crosslinking. It catalyses cleavage of the peptide, thiol ester or ester bond of carbonyl donors Z-R1-CONH-CHR2-COX-CHR3-COO- (where X is NH, S or O) and transfers the electrophilic group Z-R1-CONH-CHR2-CO to amino acceptors via an acyl-enzyme intermediate. Kinetic data suggest that the amino acceptor behaves as a simple alternative nucleophile at the level of the acyl-enzyme in the case of thiol ester and ester donors, and that it binds to the enzyme.carbonyl donor Michaelis complex and influences the rate of enzyme acylation by the carbonyl donor in the case of amide donors. Depending on the nature of the scissile bond, the enzyme has different requirements for substituents at positions R1, R2 and R3.

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