In the crystal structure of the title compound, [Co(C(8)H(8)O(5))(C(3)H(4)N(2))(3)]·3.35H(2)O, the central Co(II) ion is in a slightly distorted octa-hedral environment, coordinated by the bridg-ing O atom from the bicyclo-[2.2.1]heptane ligand, by two carboxyl-ate O atoms from two different carboxyl-ate groups and by three N atoms from imidazole ligands. Uncoordinated water mol-ecules, some of...

The title complex, [Co(C(8)H(8)O(5))(H(2)O)(3)]·H(2)O, was synthesized by reaction of cobalt acetate with 7-oxabicyclo-[2.2.1]heptane-2,3-dicarb-oxy-lic anhydride (norcantharidin) in aqueous solution. In the mol-ecule, the Co(II) atom is six-coordinated in a distorted octa-hedral environment, binding to the bridging O atom of the bicyclo-heptane unit, to two O atoms from monodentate carboxyl-at...

The title salt, K(+)·C(8)H(8)NO(5) (-) [systematic name: potassium (2R,5R,Z)-3-(2-hy-droxy-ethyl-idene)-7-oxo-4-oxa-1-aza-bicyclo-[3.2.0]heptane-2-carb-oxyl-ate], a widely used β-lactam anti-biotic, is usually chemically unstable even in the solid state owing to its tendency to be hydrolysed. In the crystal structure, the potassium cations are arranged along the a axis, forming inter-actions to...

The title compound, C(10)H(16)O(3), with a bicyclo-[3.1.1]heptane unit, was obtained by oxidation of β-pinene. The asymmetric unit contains two independent mol-ecules with similar geometry: the six-membered rings in both mol-ecules adopt envelope conformations. In the crystal, the independent mol-ecules exist as O-H⋯O hydrogen-bonded dimers. The dimers are linked into helical chains along the b...

Full (1)H and (13)C NMR chemical shift assignments were made for two sets of penam beta-lactams: namely, the diastereomeric (2S, 5S, 6S)-, (2S, 5R, 6R)-, (2S, 5S, 6R)-, and (2S, 5R, 6S)-methyl 6-(1,3-dioxoisoindolin-2-yl)-3,3-dimethyl-7-oxo-4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylates (1-4) and (2S, 5R, 6R)-, (2S, 5S, 6R)-, and (2S, 5R, 6S)-6-(1,3-dioxoisoindolin-2-yl)-3,3-dimethyl-7-oxo-4...

The title compound C(23)H(26)O(7), was prepared by esterification of 2-ethyl-7-hydr-oxy-8-methoxy-methyl-4H-chromen-4-one with (S)-(-)-camphanic chloride. The two rings of the chromone system are coplanar, making a dihedral angle of 1.99 (19)°, and the camphanoyl unit substituted at 7-O retains the original bicyclo-[2.2.1]heptane conformation of the starting reagent.

Indandione 1 was brominated to yield 2-bromoIndandione 2 which on further reacted with substituted thiocarbamides, carbamides, 2-aminothiophenols, 2-aminophenol and triazoles to furnished 3-substituted aniline-2-thia-4-aza-6,7-benzo-8-oxo-bicyclo [3.3.0]-1(5),3-octadiene 3, 3-substituted aniline-2-oxa-4-aza-6,7-benzo-8-oxo-bicyclo [3.3.0]-1(5),3-octadiene 4, 2-Thia-5-aza-9-oxo-3,4-(3’-substitut...

The polymeric title complex, [Co(C(8)H(8)O(5))(H(2)O)(2)](n) was synthesized by reaction of cobalt acetate with 7-oxabicyclo-[2,2,1]heptane-2,3-dicarb-oxy-lic anhydride. The Co(II) ion is six-coordinated in a distorted octa-hedral environment, binding to two water O atoms, to the ether O atom of the bicyclo-heptane unit, to two carboxyl-ate O atoms from two different carboxyl-ate groups of the ...

Ionic liquids such as 1,3-dialkylimidazolium salts make excellent catalysts and solvents for synthesis of dialkyl 2-(dialkoxyphosphoryl)-3-(1-oxo-1-H-phthalazin-2-yl)succinates from 2H-phthalazin-1-one, dialkyl acetylenedicarboxylates, and trialkyl phosphites. Under similar conditions, triphenyl phosphite led to dialkyl 2-(diphenoxyphosphoryl)-3-(1-oxo-1-H-phthalazin-2-yl)succinates. The ionic ...