Heterocyclic chemistry

Acid_Base Catalysis in the Synthesis of Arylmethylene and Alkylmethine Pyrroles

by Claudius D'Silva

A New Method to N-Arylmethylene Pyrroles from N-Acylpyrroles

by Claudius D'Silva

Synthesis, 1996, 457-458.

Synthesis and Anti-Bacterial Activities of a Bis-Chalcone Derived from Thiophene and Its Bis-Cyclized Products

by Abdullah Asiri

New Conjugated Systems Derived from Piperazine-2,5-dione

by Abdullah Asiri

Abstract: The preparation of monoarylidene and both symmetrical and unsymmetrical bis-
arylidene derivatives of... more Abstract: The preparation of monoarylidene and both symmetrical and unsymmetrical bis-
arylidene derivatives of piperazine-2,5-dione is described. The use of 1,4-diacetyl-
piperazine-2,5-dione make it possible to prepare unsymmetrical bisarylidenes. The intro-
duction of a dicyanomethylene moiety into the para position of one of the arylidene groups
gave a remarkable deepening in the colour of the resulting compounds 11 and 16.