Within the second objective, we will strive to establish first-of-its-kind applications of chalcogen-based Lewis acids
in organic synthesis and organocatalysis.
It is known that aziridines are not reactive towards nucleophilic compounds unless the nitrogen has been quatemized, protonated or has formed a Lewis acid
Their frustrated pair comprised of the Lewis base tetramethylpiperidine or TMP and the Lewis acid
The high acute toxicity of these compounds underscores the need to detect, decontaminate, and destruct these chemicals in order to protect human health and ecosystems Oxides of many metals are highly ionic and high melting, and their surfaces exhibit both Lewis base and Lewis acid
The 3-APB Lewis acid
receptor endows the hydrogel with saccharide responsivity, and ATMA is included at the specified concentration because of its ability to modify the sugar response of the sensor and increase its selectivity for glucose over other saccharides possessing cis-1,2- or -1,3-diols, including the main potential interferent for phenylboronic acids, fructose.
2] compared donor-acceptor complexes of the Lewis acids
These copolymers can be prepared in a conventional butyl type slurry polymerization process employing Lewis Acid
based carbocationic catalysis over a wide range of isobutylene/PMS ratios as shown in figure 1.
As one initiator of Lewis acids
, aluminum trichloride (AIC[1.
The technique uses the Lewis acid
tris(pentafluorophenyl) borane and the Lewis base tetramethylpiperidine that have been modified to be too large to get close enough to form an adduct (Lewis bases, which carry a lone pair of electrons, can bond with Lewis acids
to form molecules called adducts).
Scientists mainly in Japan, but also in China, Singapore, France, Canada, and the US are the authors, with chapters on the many uses of Lewis acid
as a catalyis for organic synthesis including Mg(II), Zn(II), Ca(II), Li(I), Na(I), K(I), Boron(III), Al(III), Ga(III), IN(III), Si(IV), Sn(II & IV), Bismuth(III), and polymer-supported metal Lewis acids
, among others.
the famous Koppel-Palm equation), substituent effects, photoelectron spectroscopy, gas-phase equilibriums involving both Bronsted and Lewis acids
and bases, acid-base equilibriums in different media starting from the most common--water--and ranging to such an exotic one (for charge-transfer reactions) as heptane, where until recently the accurate determination of [pK.
Boronic acids are well-known Lewis acids
, which can accept the electron pairs from oxygen of an alcohol.