[ n ]‐Cyclo‐9,9‐dibutyl‐2,7‐fluorene ( n =4, 5): Nanoring Size Influence in Carbon‐Bridged Cyclo‐ para ‐phenylenes

[n]Sila-acenes (n=2-4): The Influence of Ring Size on the Properties

The structures and properties of [n]sila-acenes (n=2-4) were investigated by density functional theory method. The results of calculations were obtained at B3LYP/6-311G (d,p) level on model species. Energetic criteria suggest that 2-1b (n=2), 3-1b (n=3), and 4-1b (n=4) isomers enjoy stabilization. By frontier orbital analysis, these systems are among the most stable of the family. Also, calcula...

[n]sila-acenes (n=2-4): the influence of ring size on the properties

N 6,3′-cyclo-5′-O-Cyano­methyl­thymidine

The title compound, C(19)H(20)N(4)O(4), is a cyclo-nucleoside with a C-N linkage. The furan-ose ring adopts a twist C3'-endo/C2'-exo (close to (3)T(2)) conformation with a pseudorotational phase angle (P) of 8.1° and puckering amplitude (v(m)) of 30.6°. The orientation of the pyrimidine ring with respect to the sugar group is anti. One intra-molecular C-H⋯O hydrogen bond is observed. The packin...

Synthesis of N, N΄3, 4-Dialkylamino-1, 2, 5-Oxadiazoles

N, N΄-3, 4-di(methylamino)-1, 2, 5-oxadiazole (1f) was prepared by dehydration of N, N΄-3, 4-di(methylamino)glyoxime (2f) in aqueous potassium hydroxid at 170-180 ˚C. Under similar conditions N, N΄-3, 4-di(benzylamino)-1, 2, 5-oxadiazole (1c) and N, N΄-3, 4-di(isopropylamino)...

cyclo-Tris[μ-5-(2-pyrid­yl)pyrazol-1-ido-κ3 N 1,N 5:N 2]tris­ilver(I)

In the title compound, [Ag(3)(C(8)H(6)N(3))(3)], the asymmetric unit contains three silver cations and three depronated 5-(2-pyrid-yl)pyrazol-1-ide ligands. Each silver cation is chelated by one 5-(2-pyrid-yl)pyrazol-1-ide ligand, which also acts as a bridging ligand towards the next silver ion via the second pyrazole N atom. In summary, three silver cations and three deprotonated 3-(2-pyrid-yl...