โ Scribed by Henninger, Joachim ;Mayr, Herbert ;Patz, Matthias ;Stanescu, Michaela Dina
No coin nor oath required. For personal study only.
The kinetics of the hydride transfer reactions of the dibenzoโtropylium ion (2) with dimethylphenylsilane (5) and triphenylsilane (6) were used to determine its electrophilicity parameter E = โ0.71. The nucleophiles 7โ9 react 10โ40 times faster with 2 than expected from the linear free energy relationship (1), probably due to the formation of a โstabilized carbocation (e.g. 15). A detailed investigation of the reaction of 2 with isobutene (4) shows that the linear addition product 13a and the cyclization products are not formed via a common intermediate.
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## Abstract The ^1^H NMR spectrum of tropylium fluoroborate dissolved and oriented in a lyotropic decyl sulphate phase has been recorded and analysed. Direct as well as indirect H๏ฃฟH coupling constants have been obtained. The vibrationally uncorrected proton skeleton structure deviates slightly from
Some of the more electronegative transition metals can also be surface metallized by Zintl anions via a similar mechanism. Treatment of Pt foil with &Pb9 in en (24-48 h, 2SยฐC) gives lead crystals surrounded by a potassiumrich phase (XRD, SEM, EM/EDX). The potassium-rich phase is not present as K' as