Boron–carbon coupling constants: II—the tetraphenylborate anion

Abstract

Boron-carbon coupling constants were obtained from the lac FT-NMR, 'H noise decoupled spectra of sodium tetraphenylboron and tetra-n-butylammonium tetraphenylboron. The appearance of the spectra, as well as values obtained for J(BC), are discussed and contrasted with previously published data.

Defining Self-Assembling Linear Oligo(dioxaborole)s

“…The limited solubility and/or stability of the diesters and oligomers precludes 13 C NMR as an effective method for comparative analysis. Additionally, rapid quadrupolar relaxation associated with 11 B− 13 C coupling results in a broadened signal for the ipso -carbon, and therefore this signal is most often lost in baseline noise and not observed in the 13 C spectrum for phenylboronic acids 1c, and was used to confirm that there is no coordinative cross-linking between main-chain esters and free terminal hydroxyls 16a in solution and in the solid state 18b.…”

Rhenium–Germanium Triple Bonds: Syntheses and Reactions of the Germylidyne Complexes mer‐[X2(PMe3)3ReGeR] (X=Cl, I, H; R=m‐terphenyl)

“…: 130 °C (decomp). 1 H NMR (400.1 MHz, [D 8 ]THF, 298 K): δ =0.97 (d, 3 J (H,H)=6.9 Hz, 12 H; 2×C 2, 6 ‐CH Me A Me B , Trip), 1.35 (d, 3 J (H,H)=6.9 Hz, 12 H; 2×C 4 ‐CH Me 2 , Trip), 1.42 (d, 3 J (H,H)=6.9 Hz, 12 H; 2×C 2, 6 ‐CHMe A Me B , Trip), 1.48 (br s, 36 H; 4×P Me 3 ), 2.31 (s, 3 H; Me , toluene), 2.86 (sept, 3 J (H,H)=6.9 Hz, 4 H; 2×C 2, 6 ‐C H Me A Me B , Trip), 3.00 (sept, 3 J (H,H)=6.9 Hz, 2 H; 2×C 4 ‐C H Me 2 , Trip), 6.68 (t, 3 J (H,H)=7.3 Hz, 4 H; 4×C 4 ‐ H , BPh 4 ), 6.83 (t, 3 J (H,H)=7.4 Hz, 8 H; 4×C 3, 5 ‐H , BPh 4 ), 7.05–7.18 (m, 5 H; C 2, 6 ‐H +C 3, 5 ‐H+ C 4 ‐H , toluene), 7.23 (d, 3 J (H,H)=7.6 Hz, 2 H; C 3, 5 ‐ H , C 6 H 3 ), 7.24 (s, 4 H; 2×C 3, 5 ‐ H , Trip), 7.26 (m, 8 H; 4×C 2, 6 ‐H , BPh 4 ), 7.53 ppm (t, 3 J (H,H)=7.6 Hz, 1 H; C 4 ‐ H , C 6 H 3 ); 13 C{ 1 H} NMR (75.47 MHz, [D 8 ]THF, 298 K): δ =21.5 (s, 1 C, Me , toluene), 23.9 (s, 4 C, 2×C 2, 6 ‐CHMe A Me B , Trip), 24.6 (s, 4 C, 2×C 4 ‐CH Me 2 , Trip), 25.8 (m, 12 C, 4×P Me 3 ), 26.4 (s, 4 C, 2×C 2, 6 ‐CH Me A Me B , Trip), 32.1 (s, 4 C, 2×C 2, 6 ‐ C HMe A Me B , Trip), 35.4 (s, 2 C, 2×C 4 ‐ C HMe 2 , Trip), 121.7 (s, 4 C, 4× C 4 ‐H, BPh 4 ), 123.7 (s, 4 C, 2× C 3, 5 ‐H, Trip), 125.6 (q, 3 J ( 13 C, 11 B)=2.8 Hz, 8 C, 4× C 3, 5 ‐H, BPh 4 ),29 126.0 (s, 1 C, C 4 ‐H, toluene), 129.0 (s, 2 C, C 3, 5 ‐H, toluene), 129.62 (s, 1 C, C 4 ‐H, C 6 H 3 ), 129.66 (s, 2 C, C 2, 6 ‐H, toluene), 136.4 (s, 2 C, C 3, 5 ‐H, C 6 H 3 ), 137.2 (q, 2 J ( 13 C, 11 B)=1.4 Hz, 8 C, 4× C 2, 6 ‐H, BPh 4 ),30 138.0 (s, 2 C, 2× C 1 , Trip), 143.2 (s, 2 C, C 2, 6 , C 6 H 3 ), 148.4 (s, 4 C, 2× C 2, 6 , Trip), 151.4 (s, 2 C, 2× C 4 , Trip), 165.3 (q, 1 J ( 13 C, 11 B)=49.5 Hz, 4 C, B‐ C 1 , BPh 4 ),30 175.3 ppm (s, 1 C, Ge‐ C 1 , C 6 H 3 ); the C 1 signal of the toluene solvate is obscured by the C 1 signal of the Trip substituents at δ =138.0 ppm; 31 P{ 1 H} NMR (121.5 MHz, [D 8 ]THF, 298 K): δ =−45.5 ppm (s, 4× P Me 3 ); elemental analysis calcd (%) for 9⋅ toluene, C 79 H 113 BClGeP 4 Re (1491.7): C 63.61, H 7.64, Cl 2.38; found C 63.71, H 7.61, Cl 2.31.…”

Ion-Bearing Propellers: Alkali Metal Complexes of Tris(2-alkoxyphenyl)amine Ionophores

“…After 10 min of shaking, the KBPh 4 precipitate was removed by filtration. The 13 C chemical shift assignments for the BAr 4 - counterions are primarily based on known 11 B− 13 C coupling constants …”