Deprotonation of tetraborane(10)

Abstract

increased stability of the parent ion on increased methyl substitution could be attributed to the ability of the methyl group to release election density into the borazine ring thus stabilizing the parent ion.The general substituent effects on the relative stability of the parent ion observed for the B-substituted vV-trimethylborazines also obtains for the B-substituted borazines. Mass spectral data available in the literature were analyzed by the method described here and the results summarized in Table X. The stability of the parent ion of B-monosubstituted borazines increases in the order F < Cl < OCH3 < CH3 < Br; for the known B-disubstitüted derivatives the same order is observed. The results in both series of compounds are in general agreement with the data obtained for the corresponding N-trimethylborazine derivatives. A comparison of the results in Tables IV and VIII indicates that the loss of a hydrogen atom from an //-methyl group is more facile than from a B-methyl group, which is in agreement with the more ready formation of an immonium ion (II).

Deprotonation of a Seemingly Hydridic Diborane(6) To Build a B−B Bond

“…The anion [ 1 H] − contains a central B−B single bond, supported by one residual μ ‐H atom, and may therefore be regarded as a formal deprotonation product of 1 H 2 . Examples of clear‐cut B−B coupling reactions through the deprotonation of neutral B( μ ‐H)B fragments are so far restricted to higher clusters B n H m with n ≥4 . Scheme shows the corresponding conversion of B 5 H 9 to give B 5 H 8 − .…”

Deprotonation of a Seemingly Hydridic Diborane(6) To Build a B−B Bond

“…[8][9][10][11] Specifically,o ur group generated the compound K[1H] from diborane 1H 2 [12,13] through ar eduction/hydride elimination sequence (Scheme 2). [14] Scheme 2s hows the corresponding conversion of B 5 H 9 to give B 5 H 8 À . 4.…”

“…4. [14] Scheme 2s hows the corresponding conversion of B 5 H 9 to give B 5 H 8 À . [15] Tr ansformations involving the abstraction of terminal BÀHprotons are even scarcer and have only been observed for Bertrandsc arbene adduct [16] and Finzes monohydridotricyanoborate anion, [17] which are equipped with strongly electron-withdrawing cyano/cAACsubstituents (Scheme 2).…”