Facile synthesis of closo-nido bis(carborane) and its highly regioselective halogenation

Synthesis, Structure, and Spectroscopy of the Biscarboranyl Stannylenes ()Sn·THF and K2[()Sn]2 ( = 1,1'(ortho-Biscarborane)) and Dibiscarboranyl Ethene ()CH=CH()

Two compounds containing a Sn(II) atom supported by a bidentate biscarborane ligand have been synthesized via salt metathesis. The synthetic procedures for (bc)Sn·THF (bc = 1,1' (ortho-carborane) (1) and K2[(bc)Sn]2 (2) involved the reaction of K2[bc] with SnCl2 in either a THF solution (1) or in a benzene/dichloromethane solvent mixture (2). Using the same solvent conditions as those used for 2 but using a shorter reaction time gave a dibiscarboranyl ethene (3). The products were characterized by 1H, 13C, 11B, 119Sn NMR, UV-vis, and IR spectroscopy, and by X-ray crystallography. The diffraction data for 1 and 2 show that the Sn atom has a trigonal pyramid environment and is constrained by the bc ligand in a planar five-membered C4Sn heterocycle. The 119Sn NMR spectrum of 1 displays a triplet of triplets pattern signal, which is unexpected given the absence of a Sn-H signal in the 1H NMR, IR spectrum, and X-ray crystallographic data. However, a comparison with other organotin compounds featuring a Sn atom bonded to carboranes reveal similar multiplets in their 119Sn NMR spectra, likely arising from long-range nuclear spin-spin coupling between the carboranyl 11B and 119Sn nuclei. Compound 3 displays structural and spectroscopic characteristics typical of conjugated alkenes.

Tungsten carbonyl σ-complexes with C-thioethers based on 9-Me3N-7,8-C2B9H11

Complexation of tungsten carbonyl moieties with C- and C,C-methylthio-derivatives of charge-compensated nido-carborane.

Double deboronation and homometalation of 1,1′-bis(ortho-carborane)

Diastereomeric diruthenium and dicobalt species derived from double deboronation and metalation of 1,1′-bis(ortho-carborane) have been prepared and characterised.

Large, weakly basic bis(carboranyl)phosphines: an experimental and computational study

Bis(carboranyl)phosphines and their {AuCl} and {Se} derivatives have been the subject of experimental and computational studies.

Developing nitrosocarborane chemistry

New nitrosocarboranes or their hydroxylamine or Diels–Alder cycloadducts have been prepared and fully characterised.

Reversible water activation driven by contraction and expansion of a 12-vertex-closo-12-vertex-nido biscarborane cluster

The metal-free reversible activation of H–OH bonds of water driven by the rearrangement of a boron cluster is presented.