Stereoselective synthesis of two potential metabolites of cis -metconazole

Crystal structure and Hirshfeld surface analysis of the fungicide metconazole

Metconazole is a systemic triazole fungicide that inhibits the ergosterol bio-synthesis pathway. It is widely used in agriculture to control fungal infections, including rusts, fusarium and septoria diseases. The mol-ecular structure is a three-ring system, namely, 5-(4-chlorobenz-yl)-2,2-dimethyl-1-(1H-1,2,4-triazol-1-ylmeth-yl)cyclo-pentan-1-ol, C17H22ClN3O, consisting of a cyclo-pentan-1-ol with 1,2,4-triazol-1-ylmethyl, gem-dimethyl and 4-chloro-benzyl groups attached at the 1-, 2- and 5-positions of the cyclo-penta-nol ring. It has two stereocentres (cyclo-penta-nol positions 1 and 5) leading to four stereoisomers, with the (1S,5R) form being the most bioactive. Despite its agricultural significance, detailed crystallographic data remain scarce. This study reports the crystal structure and Hirshfeld surface analysis of racemic cis-metconazole [(1S,5R)/(1R,5S)], determined in the monoclinic space group P21/c with two independent mol-ecules in the asymmetric unit (Z' = 2). Both exhibit similar conformations, with minor differences in the cyclo-penta-nol ring puckering and the torsion angles between the three rings. The crystal packing consists of 21-screw-related hy-dro-gen-bonded chains parallel to the b axis, with additional weak C-H⋯N and C-H⋯Cl contacts linking adjacent mol-ecules. Hirshfeld surface analysis indicates that inter-molecular inter-actions are dominated by contacts involving hy-dro-gen (96.1 and 96.7% for the two mol-ecules).

Synthetic approach to iodosulfuron-methyl and metsulfuron-methyl metabolites and their application for water analysis

A synthetic approach to ten metabolites of iodosulfuron-methyl sodium and metsulfuron-methyl was performed and reported in this study. The compounds of interest were prepared by controlled hydrolytic degradation of active substances or by de novo synthesis from commercially available triazine precursor 10. Obtained compounds were characterized by IR, NMR, and elemental analysis techniques. Metabolites and active substances were utilized during the development of a separation and quantification method using reversed-phase high-performance liquid chromatography coupled with tandem mass spectrometry. The validated method was applied for the analysis of all studied compounds in the extracts from water samples collected from the Vistula river (Toruń, Poland).

Electrosynthesis of 1,2,4-Triazolium Tetrafluoroborates

The synthesis of 1,2,4-triazolium tetrafluoroborates under electrochemical conditions is reported. The reaction is performed with stoichiometric amounts of HBF₄, which converts starting materials to their corresponding cationic forms due to protonation. As a result, sufficient conductivity is gained in MeOH, CD₃OD, and EtOH, and no additional supporting electrolyte is required. Agrochemical fungicide, (±)-triticonazole (1), is transformed in this manner into 2a, an O-methylated potential intermediate involved in the metabolism of 1, in 42% yield on a gram scale.