scholarly journals Structural Insights into the Free-Standing Condensation Enzyme SgcC5 Catalyzing Ester-Bond Formation in the Biosynthesis of the Enediyne Antitumor Antibiotic C-1027

Biochemistry ◽  
2018 ◽  
Vol 57 (23) ◽  
pp. 3278-3288 ◽  
Author(s):  
Chin-Yuan Chang ◽  
Jeremy R. Lohman ◽  
Tingting Huang ◽  
Karolina Michalska ◽  
Lance Bigelow ◽  
...  
Keyword(s):  
Bond Formation ◽  
Ester Bond ◽  
Antitumor Antibiotic ◽  
Free Standing ◽  
Structural Insights

Synthesis of para-olivetol depsides

1974 ◽  
Vol 27 (8) ◽  
pp. 1767 ◽  
Author(s):  
JA Elix
Keyword(s):  
Bond Formation ◽  
Trifluoroacetic Anhydride ◽  
Ester Bond ◽  
Catalytic Hydrogenolysis

The unambiguous synthesis of the lichen depsides, anziaic, perlatolic, 2'-O-methylanziaic, 2-O- methylperlatolic, 2'-O-methylperlatolic, 4-O-demethylplanaic, planaic, imbricaric and stenosporic acids is reported. Where necessary the phenolic and carboxy groups of the intermediate phenols were protected by O-benzylation until after the depside-ester bond formation had been achieved by treatment with trifluoroacetic anhydride. Catalytic hydrogenolysis of the depside esters so formed subsequently gave the natural acids.

scholarly journals Optical absorption property of oxidized free-standing porous silicon films

2000 ◽  
Vol 72 (1-2) ◽  
pp. 237-243 ◽  
Author(s):  
Dongsheng Xu ◽  
Guolin Guo ◽  
Linlin Gui ◽  
Youqi Tang ◽  
G. G. Qin
Keyword(s):  
Optical Absorption ◽  
Thermal Oxidation ◽  
Quantum Confinement ◽  
Oxidation Process ◽  
Energy Gap ◽  
Quantum Confinement Effect ◽  
Bond Formation ◽  
Confinement Effect ◽  
Transmission Curve ◽  
Free Standing

We have systematically studied the evolution of the optical absorption of free-standing PS films during thermal oxidation at 200°C in air. Our experiment results show the evolution of transmission curve is quite complicated, which red-shifts first and then blue-shifts during thermal oxidation. At the same time, the transmission at the low energy decreases first and then increases. We propose an explanation as follows: (1) the energy gap associated with each crystallite should increase during thermal oxidation process, due to the quantum confinement effect; (2) the energy gap should decrease with an increase in oxygen termination atoms. Both the increasing of the gap due to the quantum confinement effect and the decreasing of the gap due to the Si-O bond formation cause a complicated evolution of optical absorption.

scholarly journals Understanding the mechanism of ester bond formation in bacterial adhesins

2017 ◽  
Vol 73 (a2) ◽  
pp. C226-C226
Author(s):  
Yuliana Yosaatmadja ◽  
Ted Baker ◽  
Paul Young ◽  
Christopher Squire
Keyword(s):  
Bond Formation ◽  
Ester Bond ◽  
Bacterial Adhesins

scholarly journals Zeolite-Based Catalysts: A Valuable Approach toward Ester Bond Formation

Catalysts ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 758 ◽  
Author(s):  
Nadia Fattahi ◽  
Konstantinos Triantafyllidis ◽  
Rafael Luque ◽  
Ali Ramazani
Keyword(s):  
Organic Synthesis ◽  
Size Structure ◽  
Bond Formation ◽  
Industrial Processes ◽  
Ester Bond ◽  
Laboratory Studies ◽  
Catalytic Systems ◽  
Wide Range ◽  
Catalytic Applications ◽  
Insight Into

Zeolite-based catalysts are versatile catalytic systems for a wide range of laboratory studies and industrial scale processes. The chemical composition, ion exchange, and pore size structure attributes of zeolites are responsible for their extensive catalytic applications. Esterification is one of the most important and routinely processes in diverse fields of organic synthesis. It has a long history in both industrial processes and laboratory work due to its versatility. This review intends to give a detailed insight into the significance of zeolite-based catalysts for ester bond formation

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