The ring contraction-lactamisation of anhydrides upon reaction with trimethylsilylazide in the presence an amine catalyst has been studied. Under controlled conditions, 5,- 6- and 8-membered lactams can be generated from cyclic operationally simple procedure. In case ?-lactams, methodology allows for synthesis challenging systems incompatible usual disconnection involving activated carbonyl gro...

The model of the pseudo-homogeneous, one-dimensional, cooled tubular reactor is applied to two consecutive, irreversible first order reactions. A criterion is derived to obtain a desired integral yield. Based on this criterion three requirements are formulated, which enable us to choose the relevant design and operating conditions. If any of the requirements are met, the reactor is also safe wi...

Chiral oligomeric diimides prepared from pyromellitic dianhydride, (R,R)-1,2-diaminocyclohexane and phthalic anhydride fold into M or P helical conformers; trimer 1 folds into the P conformer in the crystal but the M conformer dominates in solution; longer chain oligomers 2 and 3 form preferentially P conformers in solution, as a result of intermolecular interactions.

It is a great challenge to develop semicrystalline polyimides exhibited significant recrystallization ability and fast crystallization kinetics from the melt. A series of semicrystalline polyimides based on 1,4-bis(3,4-dicarboxyphenoxy)benzene dianhydride (HQDPA) and different diamines, including 1,3-bis(4-aminophenoxy)benzene (TPER), 1,4-bis(4-aminophenoxy)benzene (TPEQ), 4,4′-oxydianiline (4,...

The compounds containing the complex ion or complex molecule in which central metal atom or ion is surrounded by a number of oppositely charged ions or molecules are known as co-ordination compounds [1], complex compound or simply complex. Coordination basically refers to the "coordinate covalent bonds" (dipolar bonds) between the ligands and the central atom in 1914, when first coordination co...

The title compound, C(21)H(22)N(2)O(3), was synthesized by the reaction of tert-butyl-hydrazine with phthalic anhydride and further O-benzoyl-ation of the resulting inter-mediate by 3,5-dimethyl-benzoyl chloride. Inter-molecular C-H⋯O=C inter-actions link the mol-ecules into layers.

well as their derivatives have not been widely applied as therapeutics so far, although they exhibit significant biological activities e.g. antibacterial [1], antituberculitic [2, 3], antitumorus [4], antibacillary [5]. Amidrazones are also used for the synthesis of heterocyclic systems, 1,2,4ñtriazole derivatives [6, 7, 8]. Moreover the compounds, containing cyclic substituents (cyclopropyl, c...