The Chemistry of the Sydnones

Spectral LFER Studies on Some Sydnone Chalcones

“…When these data are produced satisfactory correlations in multi-regression analysis with σ I, σ R and Swain-Lupton's constants [33]. The generated multi-regression analysis equations are given in (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19) …”

“…With reactivity and stability they are fairly different compounds from other aromatics [2]. Sydnones plays on important role in medicinal, heterocyclic and theoretical chemistry [3]. These compounds used as key intermediates for synthesis of organic compounds and possess physiological potentials.…”

Steric effects on the sydnones reactivity. New sydnones and pyrazoles

“…[1][2][3][4][5] Sydnones can readily prepared by cyclodehydration of N-substituted-N-nitroso-aminoacids 1 with reagents such as acetic anhydride. The resulting compounds contain a mesoionic aromatic system which can be depicted with polar resonance structures.…”

“…The 4-unsubstituted sydnones 7a and 7b were prepared in good yields by known procedure [1][2][3][4][5][6] from the corresponding N-arylglycines 6a and 6b (Scheme 2). The chemical shift of the 4-H proton of sydnones 7a and 7b in DMSO-d 6 appears as being unusually high (δ = 7.47 and 7.51 ppm) as compared to those measured in other solvent as CDCl 3 (δ = 6.48 ppm).…”

Structures of 3-(p-benzyloxyphenyl)sydnone (1) and 3-(p-isopropoxyphenyl)sydnone (2)

“…There are a few studies on the unique aromaticity of the sydnone ring (Stewart, 1964;Ohta & Kato, 1969). The dominant delocalized form of the sydnone ring among the possible resonance structures Bond lengths and angles are shown in Fig.…”