Concert recording 2022-10-12

[Track 1]. Sonata for four trombones / Georg Daniel Speer -- [Track 2]. Scarborough fair / traditional ; arr. Bill Reichenbach -- [Track 3]. Quartet for trombones / Leslie Bassett -- [Track 4]. You made me love you / James Monaco ; arr. Bill Holcombe -- [Track 5]. Fanfare for 8 trombones / Michael P. Terry -- [Track 6]. Andante cantabile from Symphony no. 5, Mtv. II / Pyort IIlich Tchaikovsky ; arr. Nolan Miller -- [Track 7]. Rising tide / Jack Wilds

Concert recording 2022-10-12

[Track 1]. Sonata for four trombones / Georg Daniel Speer -- [Track 2]. Scarborough fair / traditional ; arr. Bill Reichenbach -- [Track 3]. Quartet for trombones / Leslie Bassett -- [Track 4]. You made me love you / James Monaco ; arr. Bill Holcombe -- [Track 5]. Fanfare for 8 trombones / Michael P. Terry -- [Track 6]. Andante cantabile from Symphony no. 5, Mtv. II / Pyort IIlich Tchaikovsky ; arr. Nolan Miller -- [Track 7]. Rising tide / Jack Wilds

Unsupported boron–carbon σ-coordination to platinum as an isolable snapshot of σ-bond activation

σ-Complexes of transition metals—key intermediates in metal-mediated bond activation and homogeneous catalysis—have traditionally been isolable only when chelating or when one of the participating atoms is hydrogen. Here, by treating the Lewis-basic transition metal complex [Pt(PEt3)4] with an electron-poor borirene, we isolate a complex with an unsupported borirene ligand bound, not through the unsaturated C=C bond, but exclusively via a B–C single bond. Using NMR spectroscopy, X-ray crystallography and density functional theory calculations, we show, herein, that coordination of the borirene ligand is based on electron donation from the B–C σ bond to the metal, aided by a strong Pt-to-B dative interaction. The complex is the first isolable non-agostic σ-complex featuring two p-block elements and has broad implications as a model for the metal-mediated activation of strong p-block-p-block σ-bonds