Amines, interaction with

In the presence of aprotonic organic solvents, both aromatic and aliphatic amines interact with 4-nitrophenyldiazonium in the same way. The first stage yields fast in corresponding triazenes. At the second stage, irrespective of initial amine nature, triazenes interact with an excess of diazo reagent and fonu l,3-bis(4-nitrophenyl)-triazene. Triazenes of aliphatic amines transform fast as well. In case of aromatic amines, the second stage yield depends on the inductive constants of substituents in an azo component. 

Dioxygen is a weak oxidant. Nevertheless, phenols and aromatic amines interact with dioxygen at elevated temperatures according to the reaction [23,31,32,38,52]... 

Owing to the presence of the amine and cyanide ligands, known to give rise to specific donor-acceptor interaction with solvents [126-130], an interesting solvatochromic behavior is observed for these species. For complex 1 the spectral changes are dominated by amine interactions with the solvents as shown by the linear correlation of the solvent donor number [131] with the IT band maxima and with the half-wave potential of the ruthenium amine moiety. 

Gay and Liang also found large changes in 13C chemical shifts when amines interacted with Bronsted acid sites, and smaller ones when the interaction involved Lewis acid sites. They suggested therefore that fractional coverage of the surface of the amine could be calculated from the magnitude of the 13C chemical shift, based on wo assumptions (1) that chemical shifts are average values from protonated and unprotonated amine molecules and (2) that the shift for a protonated molecule is the same as for the acid solution of the amine. Experiments showed that both assumptions were well founded. It follows that the fraction, /B, of amine molecules bonded to the Bronsted sites can be derived from the equation... 

Apart from the unique adduct 5150, in which two plumbylene moieties are bridged by a MgBr2(thf)4 molecule viaBr —> Pb interactions [Pb—Br 296.4(2) pm], and few cyclopen-tadienyl derivatives where chelating amines interact with the two-valent tetrel atom62, unsupported adducts of Lewis bases with tetrylenes have been restricted to carbene-type bases so far. However, only donor carbenes, such as Arduengo carbenes, isonitriles or ylids, form simple adducts with dative C —> E interactions (Table 8). Carbenes or analogous species which also exhibit a substantial acceptor ability form multiple bonds instead (see Section III). 

Unsaturated amines interact with K2PtCl4 in hydrochloric acid to produce a zwitterion (213) (R or R = H, C2H5, allyl, or w-octyl, n = 1-3) in which the double bond is coordinated at Pt(II) (114, 164). With diallylamine, there is coordination at only one double bond. With... 

The temperature effect could be explained by the chelation mechanism. - The Schiff s base composed of a-keto acid and optically active amine interacted with the catalyst to form a substrate-catalyst complex (14) at lower temperature at higher temperatures, the population of the unchelated structure (15) would increase as shown in Scheme 6. Asymmetric hydrogenation involving () )-a-phenylglycinate and ethyl pyruvate has also been studied. ... 

K and exothermic at 723 K) correspond to the decomposition and combustion, respectively of the amine interacting with the stronger (Bronsted) acid sites. The two step combustion of the template molecules in air indicate that atleast a part of the template is more strongly adsorbed than the rest. This observation is also supported by the results of the TPD of ammonia (Fig. 3) which shows the presence of two types of acid sites namely, weak and strong acid sites. Zubowa et have earlier reported similar TGA/DTA data and have explained the results on the basis of weak and strong acid sites. 

GLENNON SEGGEL Phei isopropn amine Interaction with 5-HT2... 

To further elucidate how these secondary amines interact with EB molecules, Yang and coworkers [43,44] investigated several different cyclic secondary amines with different basicity and geometric factors (see Table 2.3). AH of these secondary amines behave as gel inhibitors. A 20% solution of EB (M of 90,000 g/mol) in NMP/secondary amine with a secondary amine EB tetramer repeat unit molar ratio of... 

FIGURE 21. Numerous macrocycles based on salicylideneamino alcohols, arising from (a and b) aliphatic and (c and d) aromatic amines, interacting with aryl boronic acids have been identified, (e) Analogous semianhydride bridged structures have also been observed. 

S I /N°I° S (nonionic surfactant) interacting with I (silicate species), or N (organic amine) interacting with I (siHcate species) by hydrogen bonding ... 

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