We report on a strategy for using SABRE (signal amplification by reversible exchange) for polarizing (1)H and (13)C nuclei of weakly interacting ligands which possess biologically relevant and nonaromatic motifs. We first demonstrate this via the polarization of acetonitrile, using Ir(IMes)(COD)Cl as the catalyst precursor, and confirm that the route to hyperpolarization transfer is via the J-c...

In this paper, we report a novel synthesis of anhydrous 1-hydroxy-2,2,6,6-tetramethyl-piperidine (TEMPO-H). An X-ray crystal structure and full characterization of the compound are included. Compared to hydrated TEMPO-H, its anhydrous form exhibits improved stability and a differing chemical reactivity. The reactions of anhydrous TEMPO-H with a variety of low-valent carbon centres are described...

We investigate the conditions under which systems of two differential eigenvalue equations are quasi exactly solvable. These systems reveal a rich set of algebraic structures. Some of them are explicitely described. An exemple of quasi exactly system is studied which provides a direct counterpart of the Lamé equation.

We derive and investigate the S-matrix for the su(2|3) dynamic spin chain and for planar N = 4 super Yang-Mills. Due to the large amount of residual symmetry in the excitation picture, the S-matrix turns out to be fully constrained up to an overall phase. We carry on by diago-nalising it and obtain Bethe equations for periodic states. This proves an earlier proposal for the asymptotic Bethe equ...

Tandem iron/zinc or iron/indium-catalysed reductions of various primary amides to amines under hydrosilylation conditions are reported visible light activation. By a simple modification the nature co-catalyst (Zn(OTf)2 vs In(OTf)3), Fe(CO)4(IMes) can promote highly chemoselective reduction into (21 examples, up 93 % isolated yields) and secondary (8 51 yields), respectively. Notably, both benza...

The interaction of N,N0-bismesitylimidazolin-2-yl (IMes) with alcohols is discussed. NMR spectroscopy and X-ray crystallography were used to examine the influence of solvent and alcohol on this interaction. The stabilizing effect of these interactions may be used for the storage of nitrogen–heterocyclic carbenes (NHCs) since removal of the volatiles liberates the NHC. 2008 Elsevier Ltd. All rig...

General information. N-Heterocyclic carbene ligands and their corresponding salts (e.g., IMes and IMesBF 4 , IPr and IPrBF 4) were prepared as previously reported or under slightly modified procedures and handled in a N 2 filled drybox or using standard Schlenk techniques.