Synthesis and structures of π-allylpalladium(II) complexes containing bis(1,2,4-triazol-5-ylidene-1-yl)borate ligands. An unusual tetrahedral palladium complex

Poly(imidazolyliden-yl)borato Complexes of Tungsten: Mapping Steric vs. Electronic Features of Facially Coordinating Ligands

“…Fehlhammer first demonstrated the confluence of poly(azolyl)borate and NHC chemistries with reports of the first tris(N-alkylimidazolylidenyl)borates (HB(ImR 1 ) 3 , R 1 = Me, Et, i Pr; Scheme 2) [7][8][9][10], and whilst the trimethyl derivative HB(ImMe) 3 most closely resembles the topology of the Tp* scorpionate, its chemistry has been scarcely developed beyond the original Fehlhammer work. Rather, the ligand class has been functionally elaborated to include (i) sterically imposing N-subtituents (R 1 = t Bu, Cy, adamantly, mesityl and 2,6-diisopropylphenyl) [11][12][13][14], (ii) macrocyclic variants [15][16][17][18][19][20][21], (iii) extension to bidentate examples [5,[22][23][24][25][26][27][28][29][30][31][32][33][34], (iv) replacement of the bridgehead borohydride with phenyl or fluoro groups [35][36][37] and (v) substitution of the imidazolylidene bridges by triazolylidenes or benzoimidazolylidenes [35][36][37][38].…”

“…groups [35][36][37] and (v) substitution of the imidazolylidene bridges by triazolylidenes or benzoimidazolylidenes [35][36][37][38].…”

“…Given the important role that poly(pyrazolyl)borate ligands have played in the development of alkylidyne chemistry [58], herein we report the first carbyne complex ligated by a poly(imidazolylidenyl)borate, [W(≡CC6H4Me-4)(CO)2{HB(ImMe)3}] (HB(ImMe)3 = hydrotris(3-methylimidazoylyliden-1-yl)borate) which provides an opportunity to benchmark the donor properties of the HB(ImMe)3 ligand against more familiar tripodal tridentate ligands. The complex also serves as a groups [35][36][37] and (v) substitution of the imidazolylidene bridges by triazolylidenes or benzoimidazolylidenes [35][36][37][38].…”

Performance enhancement strategy for tetrazoles based on nitrogen–boron bonds

“…26 It could also be possible to obtain tris-(tetrazolyl) boranes by reacting triethylamine borane and azole with iodine. 27…”