The crystal structures of triethyl-1,3,5-triazine-2,4,6-tricarboxylate (I), triethyl-1,3,5-benzenetricarboxylate (II) and tris-2-hydroxyethyl isocyanurate (III) have been determined from conventional laboratory X-ray powder diffraction data using the differential evolution structure solution technique. The determination of these structures presented an unexpectedly wide variation in levels of d...

The aim of our research was to investigate theeffect of the length of the polymer chain and the concen-tration of triethyl citrate used as a plasticizer on the thermalstability of the film structure in the case of two ethyl cel-lulose films (EC 10 and EC 45) used for preparing MRdosage forms. The influence of storage time was studied bymonitoring the changes in the therm...

In the title compound, C(6)H(16)N(+)·C(7)H(5)O(4) (-), the hy-droxy groups of the 3,4-dihy-droxy-benzoate anion form O-H⋯O hydrogen bonds to the carboxyl-ate groups of two adjacent anions, generating layers propagating in the ac plane. The triethyl-ammonium cations lie between these layers, forming N-H⋯O hydrogen bonds to the carboxyl-ate groups of the anions. The structure is consolidated by w...

The title compound, C(25)H(24)N(2)O(3) was prepared by the reaction of (Z)-2-(1H-indol-3-ylmethyl-ene)-1-aza-bicyclo-[2.2.2]octan-3-one with methyl p-(bromo-meth-yl)benzoate, under phase-transfer catalytic (PTC) conditions using triethyl-benzyl-ammonium chloride and 50% w/v aqueous NaOH solution in dichloro-methane. The crystal structure indicates the presence of a double bond with Z geometry c...

ABSTRACT A series of novel 5-substituted 2-[2-(pyridyl)ethenyl]-1,3,4-oxadiazoles were efficiently synthesized by cyclocondensation of the appropriate 3-(pyridyl)acrylohydrazides with triethyl orthoesters in the presence of glacial acetic acid. The products were identified by means of spectroscopic methods and their pKA ionization constants were determined. The influence of substituents on the ...

The reaction of dimethyl acetylenedicarboxylate with OH-acid such as 2-naphthol in the presence of trimethyl or triphenyl phosphite under solvent-free conditions produce oxaphosphaphenanthrene derivatives in good yields. Also, the reaction of dimethyl acetylenedicarboxylate and trimethyl phosphite in the presence of 1-naphthol leads to succinate derivatives in excellent yields. Using triethyl p...

The title compound, C(27)H(27)N(7)O(6), a Schiff base, was synthesized by the reaction of triethyl-enetetra-mine with 3-nitro-benzealdehyde. There are two independent mol-ecules in the asymmetric unit. The central aromatic ring in one mol-ecule makes dihedral angles of 23.99 (7) and 20.06 (6)° with the two terminal rings; for the second mol-ecule, these angles are 26.14 (6) and 24.64 (6)°.