For most carbocationic polymerizations of a vinyl ether produced using a Lewis Acid
coinitiator, such as ethylaluminum sesquichloride, an appropriate concentration of Lewis base is needed to obtain a living polymerization.
3] Lewis acid
as well as Br0nsted acid increases the number of sites that has a chance to absorb large amounts of pyridine.
The procedure is based on molecules called Lewis bases, which carry a lone pair of electrons and can bond with so-called Lewis acids
to make a molecule called an adduct.
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
These Lewis acids
can bind the cis-1,2- or -1,3diols of glucose covalently to form 5- or 6-part rings.
3:15 LEWIS ACID
AND BRONSTED ACID AS CATALYSTS FOR ORGANIC
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.
catalysts can form beta-ketone polymers with a high selectivity and yields that are too low-less than 65%--to be commercially useful.
Using our novel covalently attached Lewis acid
deactivation chemistry, ZirChrom has developed a highly retentive carbon-based reversed- phase HPLC column, which is easy to use and which still has the inherent chemical stability advantages of zirconia-based HPLC columns.
Molecular recognition of carbohydrates by zinc porphyrins: Lewis acid
Lewis base combination as a dominant factor for their selectivity.
It is known that aziridines are not reactive towards nucleophilic compounds unless the nitrogen has been quatemized, protonated or has formed a Lewis acid
3:15 LEWIS ACID
AND BRONSTEAD ACID AS CATALYSTS FOR ORGANIC REACTIONS IN WATER**, Shinelle Caldwell * and Nripendra Bose, Spelman College, Atlanta, GA 30314.