A hydroxoiridium complex coordinated with 1,5-cyclooctadiene efficiently catalyzed the hydroacylation of bicyclic alkenes with 2-hydroxybenzaldehyde and its derivatives in high yields with high stereoselectivity.

Two new chelating materials (Si-DDE-o-HB, and Si-DDS-o-HB) were synthesized by modifying the activated silica gel phase with Schiff bases of 4,4'-diaminodiphenylether (DDE)/4,4'-diaminodiphenylsulfone (DDS) and o-hydroxybenzaldehyde (o-HB). The synthesized materials were characterized by FTIR and BET surface area measurement techniques. The extraction of metal ions such as Zn2+, Mn2+ and Cr3+ b...

The molecular structures of vanillin (4-hydroxy-3-methoxybenzaldehyde), isovanillin (3-hydroxy-4-methoxybenzaldehyde) and ethylvanillin (3-ethoxy-4-hydroxybenzaldehyde) were determined by means of gas electron diffraction. Among them, vanillin and ethylvanillin have a vanilla odor but isovanillin smells differently. The nozzle temperatures were 125 °C, 173 °C and 146 °C, for vanillin, isovanill...

Seven phenolic compounds, including a new phenylethanoid, named passifoside (1), and 6 previously described syringaresinol (2), berchemol (3), threo-guaiacylglycerol (4), p-hydroxybenzaldehyde (5), 3,4,5-trimethoxyphenyl- O- β-D-glucopyranoside (6), trans- p-coumaric acid (7), were identified from the aerial parts of Passiflora foetida. Their chemical structures elucidated HR-ESI-MS NMR spectra...

In this article we describe a new methodology for the total synthesis of 3,4-unsubstituted coumarins from commercially available starting materials. Six examples were prepared, including five naturally occurring coumarins--7-hydroxy-6,8-dimethoxy-coumarin (isofraxidin), 7-hydroxy-6-methoxycoumarin (scopoletin), 6,7,8-trimethoxy-coumarin, 6,7-dimethoxycoumarin (scoparone), and 7,8-dihydroxycouma...

Four acyl-hydrazones derived from 5-hydroxypicolinohydrazide and 4-hydroxybenzaldehyde (HL11), 2-fluoro-4-hydroxybenzaldehyde (HL12), 2,4-dihydroxybenzaldehyde (HL13) or 2-pyridinecarboxaldehyde (HL14) two hydrazones 2-hydrazino pyridine 4-dimethylaminobenzaldehyde (HL21) 4-diethylamino-2-hydroxybenzaldehyde (HL22) were synthesized their X-ray structures determined. Twelve rhenium(I) complexes ...

The phytochemical study of Cordia exaltata Lam. (Boraginaceae) led to the isolation, through chromatographic techniques, of nineteen secondary metabolites: 8,8'dimethyl-3,4,3',4'-dimethylenedioxy-7-oxo-2,7'cyclolignan (1), 8,8'-dimethyl-4,5-dimethoxy-3',4'-methylenodioxy-7-oxo-2,7'cyclolignan (2), sitosterol (3a), stigmasterol (3b), sitosterol-3-O-β-D-glucopyranoside (4a), stigmasterol-3-O-β-D-...

New series of three bidentate N, O donor type Schiff bases (L (1) )-(L (3) ) were prepared by using ethylene-1,2-diamine with 5-methyl furfural, 2-anisaldehyde, and 2-hydroxybenzaldehyde in an equimolar ratio. These ligands were further complexed with Co(II), Cu(II), Ni(II), and Zn(II) metals to produce their new metal complexes having an octahedral geometry. These compounds were characterized ...

A new se ries of tricarbonyl com pounds, in which the keto groups are at tached to olefinic link ages, have been syn the sized by the re ac tion be tween acetoacetanilide and ar o matic al de hydes (2-chlorobenzaldehyde, 4-chlorobenzaldehyde, 4-hydroxybenzaldehyde and vanillin) un der spec i fied con di tions. Their IR, H NMR and mass spec tral data re vealed that only one of the car bonyl grou...