A convenient n.m.r. method for the measurement of Lewis acidity at boron centres: correlation of reaction rates of Lewis acid initiated epoxide polymerizations with Lewis acidity

Systematics of BX3 and BX2+ Complexes (X = F, Cl, Br, I) with Neutral Diphosphine and Diarsine Ligands

“…Symmetry operation: a = x, ½ -y, z. Selected bond lengths (Å) and angles (°): B1F1 = 1.376 (11), B1F2 = 1.396(7), B1P1 = 2.029 (10), F1B1F2 = 110.3(5), F2B1F2a = 110.5(7), F1B1P1 = 108.4(6), F2B1P1 = 108.6(5).…”

Phase Structure Characterization by SALS of In Situ Compatiblized Binary Polymer Blends and Its Relation to Rheology

“…2 (from a paper by Kratky), [26] l 1 and l 2 represent the mean length of the line segments through regions of phase 1 and phase 2, respectively. These chord lengths are given by Equations (8) and (9), [26] which can be changed as Equations (10) and (11) if Equation (7) is substituted in. Thus, average chord lengths l 1 and l 2 can be calculated directly from the correlation distancea c and can be used to characterize the phase sizes in the binary polymer blends: [26] l 1 = a c /ϕ 2 (10)…”

“…Lewis acids are known and widely used as catalysts for many organic reactions between small molecules [1][2][3][4][5] and for polymerization reactions of monomers, [6][7][8] such as radical polymerization and epoxide polymerization. Reactions between different macromolecules, including crosslinking reactions [9][10][11] and grafting reactions, [12][13][14][15][16][17][18][19][20] can also be catalyzed by Lewis acids.…”

Borenium ionic liquids as catalysts for Diels–Alder reaction: tuneable Lewis superacids for catalytic applications

“…AN values have been reported to correlate with catalytic activity of strong boron Lewis acids, such as BBr 3 or BI 3 (AN < 120). 6 Nevertheless, in claiming practical importance of Lewis superacidity of borenium ionic liquid, it was crucial to establish that such correlation holds also for extremely high AN values. In order to compare the new borenium systems to known catalysts, a well-established model reaction was required.…”