Structural and conformational study of substituted triazines by 1H and 13C NMR analysis

High-Performance Coral Reef-like Carbon Nitrides: Synthesis and Application in Photocatalysis and Heavy Metal Ion Adsorption

“…The proton spectrum exhibited sharp resonances at 3.8, 5, and 12 ppm. The chemical shifts centered at 3.8 and 5 ppm evidenced the presence of CH interaction and H proximate from the symmetrical NH 2 group, respectively. , The broad resonance at 12 ppm revealed the possible presence of COOH functional group . Although the 1 H background is strong (green dashed line in Figure S3a), some signals could arise from the terminal CH 3 (0.9 ppm) and CH 2 (1.2 ppm) since these groups were found in the 13 C spectrum (Figure S3b) as weak peaks positioned at 14 ppm (CH 3 ) and at 60 and 70 ppm (CH 2 and CH, respectively). , The weak intensity peaks at 14, 60, and 70 ppm indicate a small fraction of aliphatic carbons that would also contribute to the C content in the synthesized samples (leading to an almost 1:1 atomic ratio of C:N, as in Table S1).…”

“…The chemical shifts centered at 3.8 and 5 ppm evidenced the presence of CH interaction and H proximate from the symmetrical NH 2 group, respectively. 43,44 The broad resonance at 12 ppm revealed the possible presence of COOH functional group. 45 Although the 1 H background is strong (green dashed line in Figure S3a), some signals could arise from the terminal CH 3 (0.9 ppm) and CH 2 (1.2 ppm) since these groups were found in the 13 C spectrum (Figure S3b) as weak peaks positioned at 14 ppm (CH 3 ) and at 60 and 70 ppm (CH 2 and CH, respectively).…”

Serinolic Amino‐s‐triazines: Iterative Synthesis of N‐Substituted Amino‐1,3‐dioxane Derivatives from l‐(p‐Nitrophenyl)serinols and Rotational Stereochemistry Phenomena

“…In previous structural approaches involving N ‐substituted amino‐ s ‐triazines and directed towards investigation of restricted rotation about C( s ‐triazine)–N< bonds,5a,5b,9 due to lpN → π( s ‐triazine) conjugation, only minor attention had been paid until now to a specific conformation5d,5e,9a defining the environment of the nitrogen atom involved in this partial double bond. The results of our iterative syntheses provided evidence of the importance of location, axial or equatorial, of the amino site in an anancomeric 1,3‐dioxane in the second and third amination steps of cyanuric chloride.…”

“…In this context, we note that the exploitation of the amino group as a selective nucleophile for substitution of a six‐membered saturated heterocycle is mentioned only occasionally in syntheses of amino‐ s ‐triazines, and mainly in recent literature relating to dendrimeric melamines,5a–5c 4‐aminopiperidine,5d,5e 4‐(aminomethyl)piperidine,5a–5c and amino sugars 5f. Only isolated interest has been paid to their intrinsic structural feature of restricted rotational phenomena about the C( s ‐triazine)–N< bonds 5d,5e…”

Evaluation of Multivalent Dendrimers Based on Melamine: Kinetics of Thiol−Disulfide Exchange Depends on the Structure of the Dendrimer

“…The exchange reactions were performed at approximately pH 4.5 to retard the rates of reaction so that more data could be collected early in the time course and errors that could result from delays in workup or data acquisition could be avoided. An overlayer preparation which has been described previously was used with 2,4,6-trihydroxyacetophenone (THAP) . A 1:1 mixture of the 1 μM dendrimer DTT solution and 10 mg/mL THAP solution in methanol was spotted in 1 μL aliquots on top of a 100 mg/mL THAP bed of matrix …”