Lewis base

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Le·wis base

(lū'wis),
a base that is an electron-pair donor.

Le·wis base

(lū'is bās)
A base that is an electron-pair donor.

Lewis base

A substance that donates an electron pair to an acid, forming a covalent bond with the acid.
References in periodicals archive ?
B3LYP/6-311+G** calculations seem to be best suited for investigation of trends in [BF.sub.3] affinities of different bases in the sense of compromise between speed and accuracy, while CBS-QB3 can be recommended for accurate calculation at absolute complexation energies between [BF.sub.3] and Lewis bases.
Generally halogen bonding is of two types, (i) halogen halogen interaction X X which is due to anisotropic distribution of electron density among halogen atoms, (ii) halogen lewis base interaction X AX.
12 Furthermore, the existence of these LUMOs confers Lewis acid properties on the Cp'M(NO)[R.sub.2] complexes, a feature clearly evident in the characteristic chemistry of CpW(NOX)([CH2SiMe.sub.3)2] SUMmarized in Figure 5.9 Hence, in addition to forming isolable 1:1 adducts with small Lewis bases (eg.
Initially, in order to determine optimal polymerization reaction conditions, the influences of catalyst quantity, Lewis base quantity, and monomer concentration on the inherent viscosity of the polymer were examined by the Friedel-Crafts acylation of IPC with a mixture of 70 mol% BPOBBP and 30 mol% DPODPS in DCE using anhydrous aluminum chloride as a catalyst and NMP as a Lewis base and the results are listed in Table 1.
Lewis bases her assertion on the results of an ongoing study of violent juvenile delinquents, as well as on previous research with young men on death row (SN: 10/31/87, p.287).
The Perrault of the Carrousel of 1662, as well as the one at the heart of the debate between the Anciens and the Modernes is what Lewis bases his study on at the beginning of his work.
Lewis bases the asymmetry of causation on counterfactual irreversibility, which fails, (11) in his view, only in those special situations in which causation asymmetry also fails, very far from our case.
Polar modifiers comprised of Lewis bases are most often employed to control the level of vinyl structures formed during lithium-based anionic polymerization in non-polar solvents.

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