Proximity between a noninteractive organic substrate and a transition metal (trans-MCl2(PEt3)2; M = Pd or Pt) is achieved by their co-encapsulation within a synthetic cage, as revealed by X-ray crystallographic analysis and NOESY experiments. Through co-encapsulation with a Pd(II) complex, a terminal alkyne was activated within the cage to give a σ-alkynylpalladium complex.

Aryl-substituted allylic chlorides are accommodated by a self-assembled cage in such a restricted orientation that the internal reaction sites are shielded while the external ones are exposed. This non-covalent protection enhances terminal regioselectivity in the allylic substitution.

The ¢x-amino group of the title compound, CTH16NsOLCl-, is positively charged; the nitroguanidinium moiety remains neutral. All atoms in the nitroguanidinium group are nearly coplanar. The side chain of the molecule consists of two planar groups which intersect almost perpendicularly at C ~.

The structure of bis(2-amino-1,5-dihydro-1-methyl-4H-imidazol-4-one-N3)dichlorocadmium(II), [CdCI2-(C4H7N30)2], consists of four-coordinate molecular units with the metal centre bonded to two imidazole N(3) atoms and two C1 ions. The coordination about the Cd atom is pseudo-tetrahedral. The amino H atom is hydrogen bonded to the carbonyl O atom of an adjacent molecule. CommentCreatinine (2-amino-1,5-dihydro-1-methyl-4H-imidazol-4-one) is the anhydride form of creatine and is produced in muscle, by dehydration of creatine phosphate, as the