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.

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

scholarly journals Fabrication of Photomagnetic Carbon Surfaces via Redox Assembly

2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Y.-L. Song ◽  
C. M. Wang
Keyword(s):  
Ruthenium Complex ◽  
Pyrolytic Graphite ◽  
Building Blocks ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Highly Ordered Pyrolytic Graphite ◽  
Ester Formation ◽  
Aminophenylboronic Acid ◽  
Carbon Surfaces ◽  
Reaction Stoichiometry

3-Aminophenylboronic acid (APBA) and the complex Ru(bpy)2(phendione)2+ (bpy = 2,2′-bipyridine, phendione = 1,10-phenanthroline-5,6-dione) were found to be useful building blocks for preparing photomagnetic carbon surfaces. Scanning tunneling microscopy (STM) showed that when APBA was diazotized in acidic sodium nitrite solutions and cathodically reduced with highly ordered pyrolytic graphite (HOPG) electrodes, nanoscale films formed on the electrodes. The resulting HOPG had strong affinities for phendione and Ru(bpy)2(phendione)2+ as the electrodes were biased in the presence of them, respectively, with voltages more negative than the cathodic peak potentials for phendione/phendiol and Ru(bpy)2(phendione)2+/Ru(bpy)2(phendiol)2+ (phendiol = 1,10-phenanthroline-5,6-diol). However, if APBA was excluded, the affinities did not exist. Boronate ester formation featured prominently in these intermolecular interactions. The average increments in the HOPG surface roughness contributed by APBA and Ru(bpy)2(phendione)2+ were roughly 1 : 2, suggesting that the reaction stoichiometry between APBA and Ru(bpy)2(phendione)2+ be 1 : 1. Ru(bpy)2(phendione)2+ could also be grafted to carbon nanotubes (CNTs) under conditions similar to those for the HOPG using ascorbate as sacrificial donor. The resulting CNTs and HOPG exhibited photomagnetism when exposed to the 473 nm light. The ruthenium complex was shown to be a room-temperature photomagnetism precursor, and APBA was shown to be an effective molecular bridge for the complex and carbon substrates.

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

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

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

In situ REM imaging of surface processes on ceramic bulk crystals from 300 to 1670 K in a conventional TEM

1991 ◽  
Vol 49 ◽  
pp. 660-661
Author(s):  
Z. L. Wang ◽  
J. Bentley
Keyword(s):  
High Temperatures ◽  
Image Resolution ◽  
Atomic Processes ◽  
Crystal Surfaces ◽  
Beam Radiation ◽  
Surface Areas ◽  
Transmission Electron ◽  
Reflection Electron Microscopy ◽  
Gas Reactions

Studying the behavior of surfaces at high temperatures is of great importance for understanding the properties of ceramics and associated surface-gas reactions. Atomic processes occurring on bulk crystal surfaces at high temperatures can be recorded by reflection electron microscopy (REM) in a conventional transmission electron microscope (TEM) with relatively high resolution, because REM is especially sensitive to atomic-height steps.Improved REM image resolution with a FEG: Cleaved surfaces of a-alumina (012) exhibit atomic flatness with steps of height about 5 Å, determined by reference to a screw (or near screw) dislocation with a presumed Burgers vector of b = (1/3)<012> (see Fig. 1). Steps of heights less than about 0.8 Å can be clearly resolved only with a field emission gun (FEG) (Fig. 2). The small steps are formed by the surface oscillating between the closely packed O and Al stacking layers. The bands of dark contrast (Fig. 2b) are the result of beam radiation damage to surface areas initially terminated with O ions.

Sign in / Sign up

Export Citation Format

Share Document