The Structural Chemistry of N‐Monolithium Borazines

The N‐Lithiation of 2,4,6‐Triphenylborazine

“…[2,3] So far, only N-monolithio-borazines, R 3 B 3 N 3 H 2 Li (R = Me, tBu, NMe 2 ) have been characterized structurally as complexes with ligands such as diethyl ether (OEt 2 ), tetrahydrofuran (THF), tetramethyl diethylene diamine (TMEDA) or 1,3,5-trimethyl-1,3,5-hexahydrotriazine (TMTA). [1] Deprotonation proceeds by an addition-elimination process as demonstrated for the reaction of tBu 3 B 3 N 3 H 3 with tBuLi. [1] Solvates of N-lithioborazines R 3 B 3 N 3 H 2 Li (R = Me, tBu, Me 2 N) are usually present in the solid state in the form of dimers.…”

“…[1] Deprotonation proceeds by an addition-elimination process as demonstrated for the reaction of tBu 3 B 3 N 3 H 3 with tBuLi. [1] Solvates of N-lithioborazines R 3 B 3 N 3 H 2 Li (R = Me, tBu, Me 2 N) are usually present in the solid state in the form of dimers. Monomers are obtained with bulky ligands such as TMTA and/or large substituents (tBu) located at the boron atoms.…”

“…Monomers are obtained with bulky ligands such as TMTA and/or large substituents (tBu) located at the boron atoms. [1] In 2,4,6-triphenylborazine, 1, the phenyl groups are twisted against the borazine plane by about 29° [ 4] leaving a cleft between the phenyl groups. Due to this geometry, it was expected that 1 might behave differently towards LiR compounds compared with 2,4,6-trimethylborazine.…”

Novel Multidentate Sulfur–Nitrogen Ligands with Enhanced Complexation Properties

“…The reactants were synthesised according to the literature: (SA C H T U N G T R E N N U N G (NSiMe 3 ) 2 [36] and (SA C H T U N G T R E N N U N G (NtBu) 2 ); [37] tBuLi and nBuLi were supplied by Chemetall GmbH. All NMR spectra were either recorded on a Bruker Avance DPX 300 MHz or Bruker Avance DRX 500 MHz spectrometer with TMS ( 1 H, 13 C and 29 Si) and LiCl ( 7 Li) as the external reference and the protons of the deuterated solvents as an internal standard. The spectra were measured at room temperature if not otherwise stated.…”

“…The three/fourfold binding motif of lithium is well known-not only in diimido complexes [11,12] but also with other ligands. [13] It is one of the preferred coordination geometries for sulfur diimido compounds with donor solvents.…”