The two title compounds, di-mu-bromo-bis{[2,6-bis(pyrazol-1-yl-kappaN(2))pyridine-kappaN](perchlorato-kappaO)copper(II)}, [Cu(2)Br(2)(ClO(4))(2)(C(11)H(9)N(5))(2)], (I), and [2,6-bis(pyrazol-1-yl)pyridine]dibromocopper(II), [CuBr(2)(C(11)H(9)N(5))], (II), were synthesized by only slight modifications of the same reaction; compound (II) was formed by adding one molar equivalent of pyrazole (C(3)...

Novel palladium(II) complexes (4-6) have been synthesized from the reaction of (E)-3{[(diethoxythiophosphoryl)-methylhydrazone]-methylene}-4-hydroxy-2H-1-benzopyran-2-one (1), E)-3-{[(dimethoxythiophosphoryl)-methylhydrazine]-methylidene}-3,4-dihydro-2H-1- benzopyran-2,4-dione (2) and (E)-3-{[(diethoxythiophosphoryl)-hydrazone]-methylene}- 4H-1-benzopyran-4-one (3), respectively, with PdCl2(PhC...

straightforward conversion of (+)-6,8-dimethoxy-3,4-dihydro-3- undecylisocoumarin (3) to the title isocoumarin was carried out. hydrolytic ring opening of (3) afforded the hydroxy acid (4) which was immediately oxidized to keto acid (5) using chromic acid, cyclodehydration of (5) afforded the 6,8- dimethoxy-3-undecylisocoumarin (6) which on selective demethylation of 8- methoxy group furnished ...

The family of the spin crossover (SCO) compounds based on the 1-bpp unit has furnished striking examples of how subtle changes in the crystal packing have important consequences in their spin transition. Small modifications of the 1-bpp unit itself have been recently reported, obtaining the indazolyl and pirazolyl derivatives [FeII(1-bip)]2+ (1, 1-bip = 2,6-bis(indazol-1-yl)pyridine), [FeII(1,2...

Enantiopure helicene-based bis(pyrazol-1-yl)pyridine (bpp-[6]helicene), with the helicene unit in position 4 of pyridine ring, have been prepared and structurally characterized. Their chiroptical properties studied experimentally, both absorption circular dichroism (CD) spectra reproduced theoretically by time-dependent density functional theory (TDDFT). Remarkably, spite remote localization re...