RESUMEN
An efficient cobalt-catalyzed C-H acetoxylation of phenols has been developed by using PIDA (phenyliodine diacetate) as a sole acetoxy source to synthesize pyrocatechol derivatives for the first time. The key feature of this method is the use of earth-abundant metal cobalt as the green and inexpensive catalyst for the acetoxylation of C(sp2)-H bonds under neutral reaction conditions. Furthermore, the gram-scale reaction and late-stage functionalization demonstrated the usefulness of this method.
RESUMEN
Highly para-selective palladium-catalyzed direct arylation of phenols with aryl iodides was demonstrated by taking advantage of the formal inverse direct arylation strategy. A series of 4-aryl phenols were synthesised by employing water as a "green" solvent under mild reaction conditions.
RESUMEN
In the title compound, [Ni(C16H12N2O5)(CH3OH)] n , the unique Ni(II) ion is coordinated in a distorted octa-hedral environment by three O atoms and one N atom from a symmetry-unique ligand in the equatorial sites. Coordination of the axial sites is provided by an O atom of a symmetry-unique methanol ligand and an O atom of a carboxyl-ate group from a symmetry-related ligand, thus generating a one-dimensional polymer parallel to [010]. In the crystal, O-Hâ¯N hydrogen bonds and π-π inter-actions, with a centroid-centroid distance of 3.693â (2)â Å, form a two-dimensional network parallel to (100). In addition, weak C-Hâ¯O and C-Hâ¯N hydrogen bonds complete a three-dimensional network. An intra-molecular O-Hâ¯O hydrogen bond is also observed.
RESUMEN
The oxolan-2-one ring in the title compound, C(12)H(9)NO(4), has an envelope conformation with the atom linking the two five-membered rings being the flap atom.
RESUMEN
In the title mol-ecule, C(24)H(17)N(3), the didhedral angles formed by the mean planes of the indole ring systems and the benzene ring are 86.44â (7) and 86.96â (7)°. The dihedral angle between the two indole ring systems is 72.08â (6)°. In the crystal, inter-molecular bifurcated (N-H)(2)â¯N hydrogen bonds link mol-ecules into sheets lying parallel to (010).
RESUMEN
In the title compound, {[Zn(C(16)H(12)N(2)O(5))]·H(2)O}(n), the unique Zn(II) ion is coordinated in a distorted square-pyramidal environment by three O atoms and one N atom from a symmetry-unique ligand. A symmetry-related ligand provides an O atom from a carboxyl-ate group to complete the coordination in the apical site and generate a one-dimensional polymer parallel to [010]. In addition to an intra-molecular O-Hâ¯N hydrogen bond, inter-molecular O-Hâ¯O and weak C-Hâ¯O hydrogen bonds are observed within the one-dimensional structure.
RESUMEN
In the title compound, C(29)H(29)N(5)O(8), the ester group is disordered over two sites with site-occupancy factors of 0.91/0.09. The crystal structure is stabilized by inter- and intra-molecular hydrogen-bond inter-actions.