140-95-4Relevant articles and documents
Unexpected formation of a tricycle in the reaction of 1,3-bis(hydroxymethyl)urea with propane-1,3-diamine
Hamoud, Fares,Ramsh,Pevzner,Fundamensky,Gurzhiy,Zakharov,Kuznetsov,Krivorotov,Khrabrova
, p. 1053 - 1056 (2014)
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Henry and Mannich reactions of polynitroalkanes in ionic liquids
Epishina, Margarita A.,Ovchinnikov, Igor V.,Kulikov, Alexander S.,Makhova, Nina N.,Tartakovsky, Vladimir A.
, p. 21 - 23 (2011)
Based on Henry and Mannich reactions of polynitroalkanes for the first time implemented in ionic liquids, ecologically pure and safe methods for the synthesis of polynitro alcohols and N-2,2,2-trinitroethyl derivatives of low basic amino compounds (urea, acetamide, 4-amino-3-methylfuroxan) have been elaborated.
Utilization of wheat straw for the preparation of coated controlled-release fertilizer with the function of water retention
Xie, Lihua,Liu, Mingzhu,Ni, Boli,Wang, Yanfang
, p. 6921 - 6928 (2012)
With the aim of improving fertilizer use efficiency and minimizing the negative impact on the environment, a new coated controlled-release fertilizer with the function of water retention was prepared. A novel low water solubility macromolecular fertilizer, poly(dimethylourea phosphate) (PDUP), was "designed" and formulated from N,N′-dimethylolurea (DMU) and potassium dihydrogen phosphate. Simultaneously, an eco-friendly superabsorbent composite based on wheat straw (WS), acrylic acid (AA), 2-acryloylamino-2- methyl-1-propanesulfonic acid (AMPS), and N-hydroxymethyl acrylamide (NHMAAm) was synthesized and used as the coating to control the release of nutrient. The nitrogen release profile and water retention capacity of the product were also investigated. The degradation of the coating material in soil solution was studied. Meanwhile, the impact of the content of N-hydroxymethyl acrylamide on the degradation extent was examined. The experimental data showed that the product with good water retention and controlled-release capacities, being economical and eco-friendly, could be promising for applications in agriculture and horticulture.
Quantitative and qualitative 1H, 13C, and 15N NMR spectroscopic investigation of the urea-formaldehyde resin synthesis
Steinhof, Oliver,Kibrik, Eleonore J.,Scherr, Guenter,Hasse, Hans
, p. 138 - 162 (2014/04/03)
Urea-formaldehyde resins are bulk products of the chemical industry. Their synthesis involves a complex reaction network. The present work contributes to its elucidation by presenting results from detailed NMR spectroscopic studies with different methods. Besides1H NMR and13C NMR, 15N NMR spectroscopy is also applied.15N-enriched urea was used for the investigations. A detailed NMR signal assignment and a model of the reaction network of the hydroxymethylation step of the synthesis are presented. Because of its higher spectral dispersion and the fact that all key reactions directly involve the nitrogen centers,15N NMR provides a much larger amount of detail than do1H and13C NMR spectroscopy. Symmetric and asymmetric dimethylol urea can be clearly distinguished and separated from monomethylol urea, trimethylol urea, and methylene-bridged urea. The existence of hemiformals of methylol urea is confirmed. 1,3,5-Oxadiazinan-4-on (uron) and its derivatives were not found in the reaction mixtures investigated here but were prepared via alternative routes. The molar ratios of formaldehyde to urea were 1, 2, and 4, the pH values 7.5 and 8.5, and the reaction temperature 60 °C. Copyright 2014 John Wiley & Sons, Ltd. 15N-enriched urea is used in combination with quantitative15N and13C NMR spectroscopy and a Virtual Reference. This allows for a detailed peak assignment and absolute quantification of the early steps of this industrial process, which involves a complex reaction network. A detailed peak assignment for all three nuclei, a full quantitative description of the reaction mixture's composition and a model describing changes in shift depending on formaldehyde substitution are given. Copyright
