lewis acidity造句

• Antimicrobial efficacies generally followed Lewis acidity values of the various metals.
• Even though triphenylborane and tris ( pentafluorophenyl ) borane are structurally similar, their Lewis acidity is not.
• Gutmann ( 1975 ) used 31 P NMR spectroscopy to parameterize Lewis acidity of solvents by Acceptor Numbers.
• This may be characterized as Lewis acidity of boron toward OH  ", rather than as Br鴑sted acidity.
• Owing to the Lewis acidity of the Li + ions, LiPF 6 also catalyses the tetrahydropyranylation of tertiary alcohols.
• This behavior is a consequence of the electronic influence of the alkoxy groups that diminish the Lewis acidity of the boron centre.
• In the context of Lewis acidity ) to optimize the material for a certain application ( e . g ., catalysis ).
• This coordination serves to activate the BH 3 as a hydride donor and to enhance the Lewis acidity of the catalyst s endocyclic boron.
• Some key properties of these four-coordinated Ti ( IV ) species are their high Lewis acidity and their high solubility in nonpolar organic solvents.
• However, this method is only applicable to 1, 1-disubstituted olefins, due to the modest Lewis acidity of the titanium-BINOL complex.
• Borane ( " BH 3 " ) occurs as the dimer diborane ( B 2 H 6 ), due to the high Lewis acidity of the boron center.
• In an alternative explanation, the low Lewis acidity for BF 3 is attributed to the relative weakness of the bond in the adducts F 3 B-L.
• The behavior of organoaluminium compounds can be understood in terms of the polarity of the C " Al bond and the high Lewis acidity of the three-coordinated species.
• :I thought that Au 2 O 3 was insoluble, so the Lewis acidity was " locked away " .-- talk ) 11 : 58, 30 July 2010 ( UTC)
• In this second step an alkoxide ( derived from a sugar ) takes the role of the hydroxide leaving group, this second step is not likely to require the lewis acidity of the calcium.
• This colourless liquid is a ligand precursor and a reagent used in MOCVD . Complexes of the conjugate base, often called Hfac  ", exhibit enhanced volatility and Lewis acidity relative to analogous complexes derived from acetylacetone.
• As one might expect, given the greater Lewis acidity of Cr ( III ) vs . Cu ( II ), MIL-101 is much more active than HKUST-1 as a catalyst for the cyanosilylation of aldehydes.
• The predominant driving force for this face-selective, intramolecular hydride transfer is the simultaneous activation of the borane reagent by coordination to the Lewis basic nitrogen and the enhancement of the Lewis acidity of the endocyclic boron atom for coordination to the ketone.
• The Lewis acidity of Mg 2 + ( p " K " a 11.4 ) is used to allow both hydrolysis and condensation reactions ( most common ones being phosphate ester hydrolysis and phosphoryl transfer ) that would otherwise require pH values greatly removed from physiological values.