Synthesis of some halogenated tetraarylborates

[B(3,5‐C6H3Cl2)4]– as a Useful Anion for Organometallic Chemistry

“…The anion [B(3,5‐C 6 H 3 Cl 2 ) 4 ] – is best prepared as the Na + salt, Na[BAr Cl2 4 ], by a slight modification of the published route,11 in that additional drying is necessary to obtain anhydrous material necessary for organometallic chemistry. This is simply achieved by heating under vacuum overnight.…”

“…The former is a 12‐electron Rh III fragment that binds arenes (e.g., fluorobenzene) in an η 6 ‐manner, whereas the latter is formally a 12‐electron Rh III centre with a supporting C–C σ‐bond and an agostic C–H interaction. Although the [BAr Cl2 4 ] – anion was originally reported in the open literature by Pacey as the Cs + salt,10 with a refinement in the synthesis by Serwatowski and co‐workers in 2003,11 as far as we are aware it has not been utilised in organometallic chemistry to generate and stabilise potentially reactive metal cations 12. We believe that this anion will be of use to the organometallic and catalysis communities as well as those interested in the structural determination of cationic species given its ease of preparation, attractive solubility properties, lack of anion disorder in the solid‐state, comparable coordinating properties to C 6 H 5 F and [BAr F 4 ] – , and its expedient use in synthesis.…”

“…[Rh(NBD)(P i Pr 3 )Cl],9 [RhCl{κ 3 ‐P t Bu 2 CH 2 CH(CH 2 ) 2 }] 4 8 and [Rh{κ 3 ‐P t Bu 2 CH 2 CH(CH 2 ) 2 }(C 6 H 5 F)][BAr F 4 ]8 were prepared according to literature methods. Na[BAr Cl2 4 ] was prepared according to a literature procedure11 and dried at 120 °C under dynamic vacuum (5 × 10 –3 Torr). All other chemicals are commercial products and were used as received.…”

Reactive p-block cations stabilized by weakly coordinating anions

“… 35 A recent noteworthy addition overcoming the frequent disorder of the also towards fluoride abstraction less stable [B(Ar CF 3 ) 4 ] – anion is the [B(Ar Cl ) 4 ] – WCA. 36 …”

Base‐Stabilized Boryl and Cationic Haloborylene Complexes of Iron

“…IR spectra were recorded on a Bruker FTIR spectrometer Vector 22 and on a FTIR spectrometer JASCO FTIR 6200 as toluene solutions. Compounds IMe,13 Na[(η 5 ‐C 5 Me 5 )Fe(CO) 2 ],14 [(η 5 ‐C 5 Me 5 )Fe(CO) 2 (CH 3 )],15 [(η 5 ‐C 5 Me 5 )Fe(CO) 2 (BCl 2 )],16 IMe ⋅ BH 3 ,17 and NaBAr Cl 4 18 were prepared according to literature procedures.…”