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13C NMR spectra of 1‐(α‐aroyloxyarylideneamino)‐1,2,3‐triazoles. Identification of 4,5‐unsymmetrically substituted derivatives
The 13C nmr spectra of the title compounds are reported. Chemical shifts of C-4 and C-5 carbons of the triazole ring are used for structural assignment of the 4,5-unsymmetrically substitutedExpand
Synthesis and a UV and IR spectral study of some 2‐aryl‐Δ‐2‐1,3,4‐oxadiazoline‐5‐thiones
Twenty four 2-Aryl-Δ-2-1,3,4-oxadiazoline-5-thione derivatives 2 were synthesized and their uv and ir spectra were studied. Correlation between σ-Hammett constants of aryl substituents and theExpand
A comparative study of the interaction of salicylaldehydes with phosphonoacetates under Knoevenagel reaction conditions. Synthesis of 1,2-benzoxaphosphorines and their dimers
Abstract The reaction of salicylaldehydes 5 with phosphonoacetates 6 gives the coumarin-3-phosphonates 7 and the 1,2-benzoxaphosphorine-3-carboxylates 8 in yields and 7:8 ratios depending on theExpand
Regio- and Stereoselective [2+2] Photodimerization of 3-Substituted 2-Alkoxy-2-oxo-2H-1,2-benzoxaphosphorines
Diethyl 1,2-benzoxaphosphorine-3-carboxylates 5 undergo a regio- and stereoselective [2+2] photodimerization reaction in methanol solution under the action of sunlight, giving in all cases theExpand
Solution conformation of Monensin free acid, a typical representative of the polyetherin antibiotics
Abstract The solution conformation of the ionophore Monensin in its free-acid form bears a close resemblance to that of its Na + salt. The backbone is folded into a closed loop, and the pseudocyclicExpand
Synthesis and spectroscopic characterization of 1‐[1,2,3‐triazol‐1‐yl]‐4‐aroylazetidin‐2‐ones
1-(N-Phenacylidene)amino-1,2,3-triazoles 3 react with propionylchloride and phenoxyacetylchloride in the presence of triethylamine to give trans- (5) and cis- (6)Expand
A new and efficient method for conjugate addition of trialkylphosphites to 3-acylsubstituted coumarins
Abstract A new and efficient conjugate addition of trialkylphosphites to 3-ω-bromoacetylcoumarin 1 catalysed by p-toluenesulfonic acid (TsOH) has been studied. Under the same conditions, anExpand
Solution conformation of septamycin and its sodium salt.
The interpretation of the 300 MHz 1H-nmr spectra of septamycin (1) and its sodium salt (1+) allow one to extract most of the parameters revealing their resemblant conformations in solution. TheExpand