Reactions of Zinc Dialkyls with (Perfluorophenyl)boron Compounds:  Alkylzinc Cation Formation vs C₆F₅ Transfer

Abstract

Reaction between ZnR2 and [H(OEt 2 ) 2 ][B(C 6 F 5 ) 4 ] in ether leads to the salts [RZn(OEt 2 ) 3 ]-[B(C 6 F 5 ) 4 ], while mixtures of ZnR 2 (R ) Me, Et) and B(C 6 F 5 ) 3 in toluene-d 8 undergo facile alkyl/C 6 F 5 group exchange to give Zn(C 6 F 5 ) 2 ‚(toluene). Mixtures of ZnR 2 and B(C 6 F 5 ) 3 in hydrocarbon/diethyl ether solvent mixtures react with alkyl transfer to afford the ion pairs [RZn(OEt 2 ) 3 ][RB(C 6 F 5 ) 3 ], whereas the reaction of ZnEt 2 with [Ph 3 C][B(C 6 F 5 ) 4 ] in toluene-d 8 proceeds with β-H abstraction to give ethene and Ph 3 CH, with the subsequent rapid formation of Zn(C 6 F 5 ) 2 .

Synthesis and Reactivity of Alkynyl‐Linked Phosphonium Borates

“…Combustion analyses were performed in house by employing a Perkin-Elmer CHN Analyzer. Mes 2 PCl, [38] ClBA C H T U N G T R E N N U N G (C 6 F 5 ) 2 , [39] [ZnA C H T U N G T R E N N U N G (C 6 F 5 ) 2 ]·C 7 H 8 , [40] and [Al-A C H T U N G T R E N N U N G (C 6 F 5 ) 3 ]·C 7 H 8 [34] were synthesized according to literature preparations. (14) was prepared as previously reported.…”

Cationic Brønsted Acids for the Preparation of SnIV Salts: Synthesis and Characterisation of [Ph3Sn(OEt2)][H2N{B(C6F5)3}2],[Sn(NMe2)3(HNMe2)2][B(C6F5)4] and [Me3Sn(HNMe2)2][B(C6F5)4]

“…[43][44][45][46][47] For instance, the reactions of ZnR 2 [R = C 6 [44][45] [(Et 2 O) 3 MgR][X] [45] and [Cp 2 Zr(OiPr)(HO-iPr)] [X]. [46] In addition, the anilinium salts [PhNMe 2 4 ] have long been known and used as activating agents in olefinpolymerisation catalysis.…”

“…[46] In addition, the anilinium salts [PhNMe 2 4 ] have long been known and used as activating agents in olefinpolymerisation catalysis. [48][49] As part of our ongoing studies on the preparation and the reactivity of main-group element cations, [43][44][45]47,50] (2) in hot toluene (Scheme 2). The 119 Sn NMR spectrum of 1 exhibited a single peak at δ -106.4 ppm, i.e.…”

19F NMR Investigations of the Reaction of B(C6F5)3 with Different Tri(alkyl)aluminum Compounds

“…Reactions of boranes with aluminum alkyls, AlR 3 or zinc dialkyls, ZnR 2 have been observed. [10,11] The combination of B(C 6 F 5 ) 3 and AlMe 3 reacts by a facile aryl/alkyl group exchange to give Al(C 6 F 5 ) 3 and BMe 3 as the main products (eq. 1).…”

“…The interpretation is provided in Figure 1 in combination with Figure 2. The assignment of the signals is based on 19 F NMR literature [10][11][12][13] with consideration of the applied molar B:Al ratios. It should be note that the exact addition of low amounts of AlEt 3 to B(C 6 F 5 ) 3 was difficult, hence, for spectra b) to e) in Figure 1 the noted B:Al ratio is meant to reflect the trend.…”