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- W2048528822 abstract "The ionisation equilibria of diarylmethyl chlorides Ar2CHCl (Ar = p-CH3O-C6H4, p-PhO-C6H4, p-CH3-C6H4 reacting with BCl3 in CH2Cl2 to give ion-pairs Ar2CH BCl−4 (KI), and the dissociation of these (KD) were studied by conductimetry and spectro-photometry. The molar conductivities are almost independent of the nature of the aryl group (3.5 · 10−3 Sm2/mol at — 70°C). The ionisation constants KI increase strongly with increasing electron releasing ability of the p-substituents. The standard ionisation enthalpies and entropies for (p-CH3-C6H4)2CHCl and (p-PhO-C6H4)(Ph)CHCl, calculated from the KI at different temperatures are negative. The dissociation constants KD [(1.9—2.9) · 10−4 mol/L at — 70°C] do not show a systematic dependence on the electron donating abilities of the substituents in the aryl groups. Small differences between the UV-vis absorption spectra of unpaired and paired ions were used to confirm the conductimetrically determined values of KD." @default.
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- W2048528822 date "1987-12-01" @default.
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- W2048528822 title "Ionisation and dissociation of diarylmethyl chlorides in BCl<sub>3</sub>/CH<sub>2</sub>Cl<sub>2</sub>solution: Spectroscopic evidence for carbenium ion pairs" @default.
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- W2048528822 doi "https://doi.org/10.1002/bbpc.19870911212" @default.
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