Synthesis of tetrafunctionalized pentiptycenequinones for construction of cyclic dimers with a cylindrical shape by boronate ester formation

2015 ◽  
Vol 56 (34) ◽  
pp. 4880-4884 ◽  
Author(s):  
Shigehisa Akine ◽  
Daisuke Kusama ◽  
Yuri Takatsuki ◽  
Tatsuya Nabeshima
Keyword(s):  
Cylindrical Shape ◽  
Boronate Ester ◽  
Ester Formation

scholarly journals On the rate of boronate ester formation inortho-aminomethyl-functionalised phenyl boronic acids

2013 ◽  
Vol 25 (2) ◽  
pp. 79-86 ◽  
Author(s):  
Byron E. Collins ◽  
Pedro Metola ◽  
Eric V. Anslyn
Keyword(s):  
Boronic Acids ◽  
Boronate Ester ◽  
Ester Formation

Injectable Self-Healing Hydrogels Based on Boronate Ester Formation between Hyaluronic Acid Partners Modified with Benzoxaborin Derivatives and Saccharides

2019 ◽  
Vol 21 (1) ◽  
pp. 230-239 ◽  
Author(s):  
Tamiris Figueiredo ◽  
Jing Jing ◽  
Isabelle Jeacomine ◽  
Johan Olsson ◽  
Thibaud Gerfaud ◽  
...  
Keyword(s):  
Hyaluronic Acid ◽  
Self Healing ◽  
Boronate Ester ◽  
Ester Formation

Facile amidinations of 2-aminophenylboronic acid promoted by boronate ester formation

2019 ◽  
Vol 17 (4) ◽  
pp. 803-806 ◽  
Author(s):  
Brighid B. Pappin ◽  
Taylor A. Garget ◽  
Peter C. Healy ◽  
Michela I. Simone ◽  
Milton J. Kiefel ◽  
...  
Keyword(s):  
High Temperatures ◽  
Boronate Ester ◽  
Ester Formation ◽  
Aminophenylboronic Acid ◽  
Amine Addition

Amidine synthesis by amine addition to nitriles normally requires high temperatures or harsh catalysts.

An approach to enzyme inhibition employing reversible boronate ester formation

MedChemComm ◽  
2011 ◽  
Vol 2 (5) ◽  
pp. 390 ◽  
Author(s):  
Ivanhoe K. H. Leung ◽  
Tom Brown Jr ◽  
Christopher J. Schofield ◽  
Timothy D. W. Claridge
Keyword(s):  
Enzyme Inhibition ◽  
Boronate Ester ◽  
Ester Formation

scholarly journals The mechanisms of boronate ester formation and fluorescent turn-on in ortho-aminomethylphenylboronic acids

2019 ◽  
Vol 11 (9) ◽  
pp. 768-778 ◽  
Author(s):  
Xiaolong Sun ◽  
Brette M. Chapin ◽  
Pedro Metola ◽  
Byron Collins ◽  
Binghe Wang ◽  
...  
Keyword(s):  
Boronate Ester ◽  
Turn On ◽  
Ester Formation

Effect of pipe expansion on the redistribution of residual stresses after molding

2020 ◽  
Vol 10 (2) ◽  
pp. 122-126
Author(s):  
Nikolay A. Makhutov ◽  
◽  
Dmitry A. Neganov ◽  
Eugeny P. Studenov ◽  
◽  
...  
Keyword(s):  
Residual Stresses ◽  
Strain Distribution ◽  
Strain State ◽  
Stress And Strain ◽  
Cylindrical Shape ◽  
Pipe Material ◽  
Pipe Expansion ◽  
Calculation Results ◽  
Residual Deformations ◽  
Stress And Strain Distribution

In the factory, pipes for trunk oil and oil product pipelines are obtained by molding and welding. To ensure a cylindrical shape and reduce technological residual stresses, expansion technology is used. Pipe expansion causes a significant change in the values of residual deformations and stresses. The article presents both the calculation results and graphs regarding stress and strain distribution during bending of the stock and their redistribution after expansion. Based on the calculation results, the final total values of residual stresses and residual deformations caused by bending and expansion were stated to be important components of the stress-strain state observed in pipelines being operated under cyclic loading, as well as those used in assessing how degradation affects the ductility of the pipe material. These factors were concluded as being reasonably taken into account when performing verification calculations regarding long-running pipelines if, based on their diagnostics and analysis, their state does not meet modern strength requirements.

Redrawing Operation a Star Shape from Cylindrical Shape Using Experimental and FE Analysis

2020 ◽  
Vol 38 (1A) ◽  
pp. 25-32
Author(s):  
Waleed Kh. Jawad ◽  
Ali T. Ikal
Keyword(s):  
Finite Element ◽  
Effective Strain ◽  
Element Model ◽  
Cylindrical Shape ◽  
Element Analysis ◽  
Punch Force ◽  
Maximum Value ◽  
Element Simulation ◽  
Blank Sheet ◽  
The Finite Element Model

The aim of this paper is to design and fabricate a star die and a cylindrical die to produce a star shape by redrawing the cylindrical shape and comparing it to the conventional method of producing a star cup drawn from the circular blank sheet using experimental (EXP) and finite element simulation (FES). The redrawing and drawing process was done to produce a star cup with the dimension of (41.5 × 34.69mm), and (30 mm). The finite element model is performed via mechanical APDL ANSYS18.0 to modulate the redrawing and drawing operation. The results of finite element analysis were compared with the experimental results and it is found that the maximum punch force (39.12KN) recorded with the production of a star shape drawn from the circular blank sheet when comparing the punch force (32.33 KN) recorded when redrawing the cylindrical shape into a star shape. This is due to the exposure of the cup produced drawn from the blank to the highest tensile stress. The highest value of the effective stress (709MPa) and effective strain (0.751) recorded with the star shape drawn from a circular blank sheet. The maximum value of lamination (8.707%) is recorded at the cup curling (the concave area) with the first method compared to the maximum value of lamination (5.822%) recorded at the cup curling (the concave area) with the second method because of this exposure to the highest concentration of stresses. The best distribution of thickness, strains, and stresses when producing a star shape by

Ester formation fromn-alkanes by fungi isolated from aircraft fuel

1970 ◽  
Vol 10 (3) ◽  
pp. 189-196 ◽  
Author(s):  
H. Iizuka ◽  
H. T. Lin ◽  
M. Iida
Keyword(s):  
Aircraft Fuel ◽  
Ester Formation
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