Two efficient and convenient procedures for the synthesis of 6-amino-3-methyl-1,4-diphenyl-1,4-dihydropyrano[2,3c]pyrazole-5-carbonitrile derivatives based on four-component reaction involving ethyl acetoacetate, phenylhydrazine, malononitrile, and various aromatic aldehydes using trichloroacetic acid or ceric sulfate as heterogeneous catalysts in excellent yields and short reaction times have ...

l,l-Diphenyl-2-methyl-l-propene produces an equimolar mixture of two carbanions in contact with excess potassium-sodium alloy in tetrahydrofuran. The carbanions can be interpreted as the products of disproportionation reaction between two radical anions produced by one-electron reduction of the phenylpropene with alkali metal.

The title compound, C(22)H(21)NO(2), was synthesized from 4-meth-oxy-2-methyl-aniline and 2-hy-droxy-1,2-diphenyl-ethanone. In the title compound, the C-C-C-N-C backbone adopts an all-trans conformation. The crystal structure is stabilized by weak inter-molecular C-H⋯O hydrogen-bond inter-actions.

The conjugate addition of Ni(II) complexes of glycine Schiff base to α,β-unsaturated aldehydes catalyzed by (S)-2-(diphenyl(trimethylsilyloxy)methyl)pyrrolidine afforded adducts in excellent yields with up to 49:1 dr and 95% ee. This method enables the construction of two adjacent chiral centers in one step, and offers an alternative route to chiral α-amino acid derivatives.

Research works proposed that radical scavenging activity of flavonoids is due to ring B, andthe remaining part of the molecule can be disregarded. Thus the objective of this work is toobserve whether hydroxytoluenes account the radical scavenging activity of flavonoid and toestablish structural requirements for their activity (as they showed appreciable activity) andelucidate a comprehensive me...

Some new Schiff-base compounds based on pyrrole were synthesized by the reaction of 2-amino-1-methyl-4,5-diphenyl-1H-pyrrole-3-carbonitrile (1)with aromatic aldehydes (2a-2e) in ethanol/acetic acid at room temperature. The structures of the Schiff bases were characterized by full spectral data. The fluorescence emission intensity of the Schiff bases has bee...