Stable radicals 2-(6-uradinyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-1-oxyl (Ur6IN) and 4-(p-tert-butylaminoxylphenyl)-2,6-di(propylamido)pyridine (DAPPN) form heterospin radical pair complexes due to complementary multi-point hydrogen-bonds.

The piperidine ring of the title compound, C15H25N3O3, adopts a slightly distorted chair conformation with the cis substituents displaying an N-C-C-C torsion angle of 43.0 (3)°. The cyano group (plane defined by C-C-C N atoms) is bent slightly out of the plane of the amide group by 13.3 (2)°. The carbamate group is oriented at a dihedral angle of 60.3 (5)° relative to the amide group.

In the title mol-ecule, C(13)H(19)NO(4), except for two C atoms of the tert-butyl group, the non-H atoms are almost coplanar (r.m.s. deviation = 0.2542 Å). In the crystal, mol-ecules are linked into centrosymmetric dimers by two inter-molecular N-H⋯O hydrogen bonds, forming an R(2) (2)(10) ring motif.

Room temperature zinc-mediated diastereoselective allylation or propargylation of isatin-derived N-tert-butanesulfinyl ketimines for synthesis of highly enantiomerically enriched tetrasubstituted 3-aminooxindoles is described.

In the title compound, C(25)H(23)BrN(2)O(4), the seven-membered ring adopts a twisted-boat conformation. The indole ring system is planar within 0.021 (2) Å and the ester group [-C(=O)-O-C-] is almost coplanar with it [dihedral angle = 3.0 (2)°]. The conformation of the ester group is influenced by intra-molecular C-H⋯O inter-actions. In the crystal structure, mol-ecules are linked into chains ...

The title compound, C40H47FN2O5, crystallizes with two independent but similar mol-ecules in the asymmetric unit. In the crystal, mol-ecules are linked into chains along [100] by inter-molecular N-H⋯O hydrogen bonds.

We examine an unusual case where a neutral hydrogen atom acts as a hydrogen-bond acceptor. The association constant between trihexylsilane and perfluoro-tert-butanol was measured as ∼0.8 M(-1) in cyclohexane. Computations and experimental NMR data are consistent with a weak, but favourable Si-H···HO interaction.

In the title compound, C21H20ClNO6, the furan moiety is located above the mean plane of the indole ring and displays rotational disorder (i.e. rotation through 180°); the site occupancy of the major component is 0.809 (6). In the crystal, C-H⋯O inter-actions link the mol-ecules into chains which run parallel to the b axis.

The hydroboration of phosphaalkynes with Piers' borane (HB(C6 F5 )2 ) generated unusual phosphaalkenylboranes [RCH=PB(C6 F5 )2 ]2 that persisted as dimers in both solution and the solid state. These P2 B2 heterocycles underwent ring opening when subjected to nucleophiles, such as pyridine and tert-butylisocyanide, to yield monomeric phosphaalkenylborane adducts RCH=PB(C6 F5 )2 (L). DFT calculat...

In the title compound, C(14)H(27)NO(5), the hydr-oxy group and one of the acetate carbonyl O atoms are linked by an intra-molecular O-H⋯O hydrogen bond, forming an eight-membered ring. This inter-action gives rise to an asymmetric mol-ecular conformation.