Nitro group attached to a benzene ring acts as a very strong lewis base
due to high electron density on oxygen and t e electron withdrawing inductive and resonance effect of nitro group .
Calculated complexation energies ([DELTA]H, in kJ/mol) of the studied Lewis bases
Often, alkali metal alkoxides are also used in conjunction with Lewis base
modifiers to achieve even higher vinyl contents (ref.
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.
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).
Treatment of 5 with a variety of Lewis bases such as P[Me.
The nitrogen analog of this heterocycle (bipytidine) is a commonly employed chelating Lewis base, which reacts with Lewis acidic metals and other species.
9 Hence, in addition to forming isolable 1:1 adducts with small Lewis bases