Ureas amides

Amide yields of up to 90—95% are reported from lauric acid and urea (1 1 mole ratio) by ramping the reaction temperature from 140 to 190°C over 4 hours. Oleic, stearic, linoleic, and ricinoleic acids gave similar results (19,20). The reaction does not form significant quantities of bisamides, but rehes on the decomposition of a substituted urea amide, releasing CO2 and NH. ... 

C-NH-CH Substituted ureas, amides, and lactams that have a hydrogen atom on a carbon atom attached to nitrogen... 

Scheme 2.58 The automated preparation of urea, amide and sulfonamide libraries.

TFA). Among various linkers studied in this work, the indole linker [21] was found to be the most suitable linker in terms of cleavage kinetics and actual cost. Rink linker was the second best in term of kinetics. The rate of cleavage of various functional groups linked to the above-mentioned resins was as follows sul-fonamide>carbamate urea>amide. Results from this study demonstrated that optimization of cleavage conditions often led to more suitable conditions and safer release of precious compounds synthesized on a solid support. 

Key anion binding moieties are strong hydrogen bonding groups such as guanidinium, ureas, amides and pyrroles. 

Banerjee S, Adarsh NN, Dastidar P (2010) Selective separation of the sulfate anion by in situ crystallization of Cd-II coordination compounds derived from bis(pyridyl) ligands equipped with urea/amide hydrogen-bonding backbone. Eur J Inorg Chem 3770-3779... 

Substituted ureas, amides Photo system 11 electron transport 20... 

Changes in Optical Rotation of Carbohydrates upon Incubation with Ureas, Amides, and Amino Acids"... 

The reaction of starch with bis(hydroxymethyl)ethyleneurea condensed with cationic poly(urea amides) and cationic polyamides was used to produce paper sizes, adhesives, and textile-finishing agents.2616 Cationic starch that has been prepared from starch and cyanamide was patented for sizing wood and for synthetic wool fibers and fabrics.2296,2298,2662 Reaction of starch urethanes with alkylene oxides and aldehydes was reported for use as hardenable compounds in waterproof films, coatings, and adhesives.2663... 

It was found that the reaction proceeds when n = 4 or 5 but not when n = 2 or 3. Difunctional macrocyclic urea amides were made by reacting the raacrocyclic urea with diacid chlorides such as isophthaloyl chloride. The utility of these cross-linkers was proven in solvent coatings, acrylic powder coatings, and electro-deposition coatings. 

Urethane and urea Amide bands coupled with the N-H stretching bands have been studied by many investigators to explore the relationship between intermolecular and intramolecular interactions and morphologies of polyether-urethanes (16, 18-20, 23-32) and polyether-urethane-ureas (15,17,21,22,33-37). The N-H groups serve as proton donors in the interactions. The possible proton acceptors in polyether-urethanes initially were assumed to be only the urethane carbonyls or polyether oxygens (16, 19, 23-27). Under these assumptions, complete phase separation characterized... 

Similar results were noted in a 1 2 homogeneous molar ratio mixture of polyether-urethane to aromatic Urea I. Also, mixtures with polypropylene glycol and aliphatic Urethane III or IV and aliphatic Urea II are similar to the trends noted in the aromatic tri-mixtures. The aliphatic mixture spectra do not have the 1320 cm-1 previously associated with the aromatic C-N stretching vibrations. The urea Amide bands also do not broaden or shift in frequency as compared to the 1 2 molar ratio mixture involving only polypropylene glycol and aliphatic urethanes or aliphatic ureas. 

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