The title compound, C(20)H(19)N(3)O, exists in a keto-enamine tautomeric form. The pyrazolone ring makes dihedral angles of 20.52 (10) and 77.73 (5)° with the two phenyl rings and an intra-molecular N-H⋯O hydrogen bond occurs. A weak inter-molecular C-H⋯O hydrogen bond is observed in the crystal structure. The allyl group is disordered over two positions, with site-occupancy factors of 0.533 (5...

Direct β-alkylation of saturated aldehydes has been accomplished by synergistically combining photoredox catalysis and organocatalysis. Photon-induced enamine oxidation provides an activated β-enaminyl radical intermediate, which readily combines with a wide range of Michael acceptors to produce β-alkyl aldehydes in a highly efficient manner. Furthermore, this redox-neutral, atom-economical C-H...

In the title compound, C(12)H(16)N(2)O(3)S(2), the S-vinyl, and tert-butyl-enamine fragments make dihedral angles of 14.19 (2) and 0.85 (2)°, respectively, with the thia-zole ring. In the crystal, mol-ecules are linked into chains with graph-set motifs C(5) along [100] by C-H⋯O inter-actions. The mol-ecular conformation is stabilized by an intra-molecular N-H⋯O hydrogen bond.

The title compound, C(15)H(15)NO, which was synthesized under solvent-free conditions by the reaction of acetoacetone and 2-naphthyl-amine, adopts a Z conformation about the C=C bond. The enamine-ketone fragment is approximately planar [maximum deviation = 0.026 (3) Å] and forms a dihedral angle of 39.78 (3)° with the naphthalene ring system. An intra-molecular N-H⋯O hydrogen bond is observed.

The asymmetric unit of the title compound, C(29)H(29)N(3)O(3), contains two mol-ecules, which exist in their enamine-keto form, being stabilized by strong intra-molecular N-H⋯O hydrogen bonds, which generate S(6) loops. In the crystal, inter-molecular C-H⋯O hydrogen bonds link the mol-ecules into chains, which are further linked by weak C-H⋯π inter-actions, forming a two-dimensional network.

The direct β-coupling of cyclic ketones with aryl ketones has been achieved via the synergistic combination of photoredox catalysis and organocatalysis. Diaryl oxymethyl or aryl-alkyl oxymethyl radicals, transiently generated via single-electron reduction of ketone precursors, readily merge with β-enaminyl radical species, generated by photon-induced enamine oxidation, to produce γ-hydroxyketon...