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Journal articles on the topic 'Urea adduct'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Döring, Cindy, Christina Taouss, Mark Strey, Lukas Pinkert, and Peter G. Jones. "Adducts of urea with pyrazines." Zeitschrift für Naturforschung B 71, no. 8 (2016): 835–41. http://dx.doi.org/10.1515/znb-2016-0071.

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AbstractThe adducts urea:2,3-dimethylpyrazine (1:1) (1), urea:2-methylpyrazine (2:1) (2), urea:2,6-dimethylpyrazine (2:1) (3), urea:2,5-dimethylpyrazine (2:3) (4) and urea:2,5-dimethylpyrazine (2:1) (5), together with the related adduct methylthiourea:2-methylpyrazine (1:1) (6), were prepared and their structures determined. In all cases, the basic motif of the packing is a urea (or thiourea for 6) ribbon consisting of linked ${\rm{R}}_2^2$ (8) rings, to which the pyrazines are often attached by bifurcated hydrogen bond systems. Adducts 1–3 present standard packing patterns of 1:1 or 2:1 urea

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2

Strey, Mark, and Peter G. Jones. "Pyridine 1:1 adducts of urea (Z′ = 1) and thiourea (Z′ = 8)." Acta Crystallographica Section C Structural Chemistry 74, no. 4 (2018): 406–10. http://dx.doi.org/10.1107/s2053229618002632.

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During our studies of urea and thiourea adducts, we noticed that no adducts with unsubstituted pyridine had been structurally investigated. The 1:1 adduct of pyridine and urea, C5H5N·CH4N2O, crystallizes in the P21/c space group with Z = 4. The structure is of a standard type for urea adducts, whereby the urea molecules form a ribbon, parallel to the a axis, consisting of linked R 2 2(8) rings, and the pyridine molecules are attached to the periphery of the ribbon by bifurcated (N—H...)2N hydrogen bonds. The 1:1 adduct of pyridine and thiourea, C5H5N·CH4N2S, crystallizes in the P21/n space gro

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3

Malinowski, Przemysław, Andrzej Biskupski, and Józef Głowiński. "Preparation methods of calcium sulphate and urea adduct." Polish Journal of Chemical Technology 9, no. 4 (2007): 111–14. http://dx.doi.org/10.2478/v10026-007-0102-z.

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Preparation methods of calcium sulphate and urea adduct The paper presents the results of laboratory studies on the preparation of calcium sulphate and urea adduct by: grinding, compacting and mixing in the presence of physical water. A method for the measurement of urea conversion into the adduct form, which is based on the difference in solubility of free urea and the adduct bound urea CaSO4·4CO(NH2)2 in n-butanol, was developed. Mixing the reagents in the presence of physical water produced the best results. High urea conversion into the adduct form, over 85%, in the prepared samples indica

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4

Döring, Cindy, Julian F. D. Lueck, and Peter G. Jones. "Structures of the adducts urea:pyrazine (1:1), thiourea:pyrazine (2:1) and thiourea:piperazine (2:1)." Zeitschrift für Naturforschung B 72, no. 6 (2017): 441–45. http://dx.doi.org/10.1515/znb-2017-0045.

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AbstractThe adducts urea:pyrazine (1:1) (1), thiourea:pyrazine (2:1) (2), and thiourea:piperazine (2:1) (3) were prepared and their structures determined. Adduct 1 forms a layer structure, in which urea chains of graph set C(4)[${\rm{R}}_{\rm{2}}^{\rm{1}}$(6)] run parallel to the b axis and are crosslinked by N–H···N hydrogen bonding to the pyrazine residues. Adduct 2 is a variant of the well-known ${\rm{R}}_{\rm{2}}^{\rm{2}}$(8) ribbon substructure for urea/thiourea adducts, with the pyrazine molecules attached to the remaining thiourea NH groups via bifurcated hydrogen bonds (N–H···)2S; the

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5

Smith, Graham, Brett A. Cloutt, Karl A. Byriel, and Colin H. L. Kennard. "Preparation and Crystal Structures of the Urea Adducts of Silver(I) Perchlorate and Silver(I) p-Toluenesulfonate." Australian Journal of Chemistry 50, no. 7 (1997): 741. http://dx.doi.org/10.1071/c96208.

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The urea adducts with silver(I) perchlorate (2 : 1) (1) and silver(I) p-toluenesulfonate (1 : 1) (2) have been prepared and their structures determined by single-crystal X-ray diffraction methods. Crystals of adduct (1) are monoclinic, space group P21/a, with four molecules in a cell with dimensions a 7·806(2), b 15·929(2), c 7·861(3) Å, β 113·35(1)°, while (2) is also monoclinic, space group P21, with two dimer units in a cell with a 5·380(3), b 25·72(2), c 7·926(5) Å, β 94·22(3)°. Both form polymer structures which are stabilized by extensive hydrogen bonding. Adduct (1) is based upon a squa

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6

Smith, Graham, and Colin H. L. Kennard. "The Crystal and Molecular Structure of the 1:1 Adduct Hydrate of Pyrazine-2,3-dicarboxylic Acid with 1,1-Diethylurea." Australian Journal of Chemistry 53, no. 12 (2000): 999. http://dx.doi.org/10.1071/ch00150.

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The adduct hydrate of 1,1-diethylurea with pyrazine-2,3-dicarboxylic acid, [(C6H4N2O4)(C5H12N2O)].H2O has been prepared and characterized using low-temperature single-crystal X-ray diffraction methods. A primary asymmetric cyclic hydrogen-bonding interaction, similar to those found in other adducts of 1,1-diethylurea with the nitro-substituted aromatic acids, was found between the amide group of the substituted urea and one carboxylic acid group of the acid. Further peripheral hydrogen-bonding associations involving both the f irst and the second carboxylic acid groups, urea and the lattice wa

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7

Chenite, A., and F. Brisse. "Poly(tetrahydrofuran)-urea adduct: a structural investigation." Macromolecules 25, no. 2 (1992): 776–82. http://dx.doi.org/10.1021/ma00028a042.

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8

Prasad, P. B. V. "Morphology of urea - palmitic acid adduct crystals." Crystal Research and Technology 25, no. 5 (1990): K108—K113. http://dx.doi.org/10.1002/crat.2170250533.

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9

Donnelly, Paul S., Brian W. Skelton, and Allan H. White. "‘Neutralmolekülcomplexe’—Structural Characterization of Some Adducts of Urea and Thiourea with N,N′-Bidentate Aromatic Bases." Australian Journal of Chemistry 56, no. 12 (2003): 1249. http://dx.doi.org/10.1071/ch03015.

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Oepen and Vögtle in 1979 recorded the formation of a number of ‘neutral molecule complexes’ between urea (ur) and/or thiourea (tu) and a number of N,N′-aromatic chelate bases derivative of 2,2′-bipyridine (bpy), motifs now widely utilized in essays in studies of molecular/crystal architecture. The structures are recorded of a number of their adducts, namely (a) bpy/ur (1 : 1), (b) phen/ur (1 : 1), (c) phen/tu (1 : 1), (d) dmp/ur (1 : 1), together with (e) bpy/tu (1 : 1) and (f) a dmp/tu adduct of 1 : 2 stoichiometry (phen = 1,10-phenanthroline; dmp = 2,9-dimethyl-1,10-phenanthroline). Associat

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10

Lynch, Daniel E., Graham Smith, Karl A. Byriel, and Colin H. L. Kennard. "Molecular Cocrystals of Carboxylic Acids. XXXII The Crystal Structures of the Adducts of 2-Aminobenzothiazole with 3,5-Dinitrobenzoic Acid (Adduct Hydrate) and 3-Aminobenzoic Acid, and 2-Amino-2-thiazoline with 2-Aminobenzoic Acid." Australian Journal of Chemistry 51, no. 7 (1998): 587. http://dx.doi.org/10.1071/c97204.

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Two adducts of 2-aminobenzothiazole and one of 2-amino-2-thiazoline with aromatic carboxylic acids have been synthesized and their X-ray crystal structures determined. These are 2-aminobenzothiazole with 3,5-dinitrobenzoic acid (the 1 : 1 adduct hydrate) (1), and 3-aminobenzoic acid (1 : 1) (2), and 2-amino-2-thiazoline with 2-aminobenzoic acid (1 : 1) (3). Compound (1) is a non-centrosymmetric proton-transfer complex and gave a signal of 0·30 relative to urea when tested for second-order non-linear optical properties. Compound (3) is also a proton-transfer complex but (2) is not.

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11

Aguila, Mae Joanne B., Joshua P. Gemperoso, King Bryan C. Gabog, and Al Jerome A. Magsino. "Eutectic System Based on Urea and Potassium Sodium Tartrate." KIMIKA 29, no. 2 (2018): 1–6. http://dx.doi.org/10.26534/kimika.v29i2.1-6.

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Deep eutectic solvents (DESs) are considered as better alternative solvents in chemical and physical processes. The binary mixture of urea and potassium sodium tartrate is explored in this study. A eutectic system is determined at composition made up of 33% potassium sodium tartrate and 67% urea (1:2 molar ratio). This eutectic system has a freezing point of 19.83 ± 0.76 °C, density of 1.1971 ± 0.0003 g mL-1, and viscosity of 34.4226 ± 0.0665 cP. The most stable conformation for the adduct of urea and potassium sodium tartrate with water molecules was determined through density functional calc

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12

Ho, Douglas M. "A urea adduct of bis(hinokitiolato)copper(II)." Acta Crystallographica Section C Crystal Structure Communications 66, no. 10 (2010): m294—m299. http://dx.doi.org/10.1107/s0108270110035602.

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13

Rodrigues, Bernardo Lages, Roland Tellgren, and Nelson G. Fernandes. "Experimental electron density of urea–phosphoric acid (1/1) at 100 K." Acta Crystallographica Section B Structural Science 57, no. 3 (2001): 353–58. http://dx.doi.org/10.1107/s0108768101004359.

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The deformation electron density of the urea–phosphoric acid adduct has been studied from 100 K X-ray and neutron diffraction experiments. Data were interpreted according to the Hirshfeld model. The long hydrogen bonds show characteristics of electrostatic interaction. Deformation density maps on the short hydrogen bond shows hydrogen more strongly bonded to urea than to phosphoric acid, and peak maxima at almost midway between the two O—H bonds.

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14

Matishev, V. A. "Formation of urea adduct with primary n-alkyl mercaptans." Chemistry and Technology of Fuels and Oils 22, no. 6 (1986): 302–4. http://dx.doi.org/10.1007/bf00719561.

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15

Li, Shu An, Run Lai Li, Zhen Ming Zhang, Kai Zhu, and Guang Jie Wang. "Improved Preparation of 2,2-Dithiobis(Pyridine-N-Oxide)." Advanced Materials Research 554-556 (July 2012): 868–73. http://dx.doi.org/10.4028/www.scientific.net/amr.554-556.868.

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2,2-Dithiobis(pyridine-N-oxide) (1) was prepared by reacting 2-pyridinethiol-N-oxide (2) and hydrogen peroxide-urea adduct (3) at the molar ratio of 1:1.25 and 45oC for 1.75h in high yield and purity of 91.6% and 99.6% respectively. The structures of product were characterized by IR, NMR.

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16

Bittner, Astrid, Detlef Männig, and Heinrich Nöth. "Solutions of Aluminium Trichloride in Tetramethylurea and the Molecular Structure of an Aluminium Trichloride Tetramethylurea Adduct." Zeitschrift für Naturforschung B 41, no. 5 (1986): 587–91. http://dx.doi.org/10.1515/znb-1986-0510.

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Abstract Aluminium trichloride forms a 1:1 addition product with tetramethylurea (1) the structure of which has been determined by X-ray methods. Tetramethylurea is bound to the AlCl3 unit via its oxygen atom; consequently, a lengthening of the CO bond is observed. The (CH3)2N units are less twisted relative to the OCN2 plane than in the free ligand. Solutions of AlCl3·OC(NMe2)2 in diethylether contain both the initial molecular adduct 1 and the ether adduct AlCl3·OEt2. In tetramethyl urea, compound 1 dissociates predominantly into the ions AlCl4- and {Cl2Al[OC(NMe2)2]2}+ . These solutions hav

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17

Matyáš, Robert, Jakub Selesovsky, Vojtěch Pelikán, et al. "Explosive Properties and Thermal Stability of Urea-Hydrogen Peroxide Adduct." Propellants, Explosives, Pyrotechnics 42, no. 2 (2016): 198–203. http://dx.doi.org/10.1002/prep.201600101.

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18

Mazumdar, Pooja Anjali, Sandip Kumar Kundu, Amit Kumar Das, Valerio Bertolasi, and Animesh Pramanik. "Formation of a Turn like Structure in BocNH(CH2)2CON(C6H11)CONH(C6H11): An X-Ray Diffraction Study." Journal of Chemical Research 2003, no. 8 (2003): 502–3. http://dx.doi.org/10.3184/030823403103174713.

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β-Alanine is an amino acid which is important in the design of diverse peptides. Crystallographic study shows that the N-acyl adduct of β-Alanine, an ω-amino acid important in peptide design for the production of structural and functional diversities, and N,N′-dicyclohexyl urea(DCU) forms a turn like structure without any intra-molecular hydrogen bonding.

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19

Komorowski, Ludwik, and Kurt Niedenzu. "New Boron-Nitrogen Analogues of Uracil Derivatives [1]." Zeitschrift für Naturforschung B 44, no. 11 (1989): 1421–26. http://dx.doi.org/10.1515/znb-1989-1117.

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The reaction of Ν,N′-dimethylurea with 1,5-dimethyl-2,4-bis-(dimethylamino)-1,5-diaza-2,4-dibora-3-oxacyclohexan-6-one (2) in the melt proceeds with condensation of the urea to yield two major products: the acid 1,3,5-trimethyl-2-hydroxy-1,3,5-triaza-2-boracyclohexa-4,5-dione (la); and a mixture of the methylammonium (4 a) and dimethylammonium salt (4b) of the anion [{CH3N(u-CONCH3)2}2B]-. Analogous products were obtained from the reaction of 2 with Ν,Ν′,N″-triorganylbiurets. The 2-hydroxy derivatives of type 1 form 1:1 molar adducts with amines (3) of variable thermal stability. The anhydride

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20

Patil, Mahadev, Anurag Noonikara-Poyil, Shrinivas D. Joshi, Shivaputra A. Patil, Siddappa A. Patil, and Alejandro Bugarin. "New Urea Derivatives as Potential Antimicrobial Agents: Synthesis, Biological Evaluation, and Molecular Docking Studies." Antibiotics 8, no. 4 (2019): 178. http://dx.doi.org/10.3390/antibiotics8040178.

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A series of new urea derivatives, containing aryl moieties as potential antimicrobial agents, were designed, synthesized, and characterized by 1H NMR, 13C NMR, FT-IR, and LCMS spectral techniques. All newly synthesized compounds were screened in vitro against five bacterial strains (Escherichia coli, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa, and Staphylococcus aureus) and two fungal strains (Candida albicans and Cryptococcus neoformans). Variable levels of interaction were observed for these urea derivatives. However, and of major importance, many of these molecul

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21

Mardonov, U. M., G. K. Kholikova, B. Sh Ganiev, I. N. Tursunova, and Sh T. Khozhiev. "Synthesis and study of the agrochemical properties of urea salts with nitric and orthophosphoric acid." E3S Web of Conferences 389 (2023): 03005. http://dx.doi.org/10.1051/e3sconf/202338903005.

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The paper presents the results of the synthesis, IR spectroscopic and agrochemical study of the products of adduct formation (internal salts) of urea with nitric and orthophosphoric acids. It has been established that the synthesized substances are hygroscopic, readily soluble in water. IR spectral data indicate that, depending on the “acid : urea” ratio in the final products CO, NH2, urea groups and acid molecules are involved in the formation of various compositions: [H2O···(NH2)2C(OH)+···-ONO2] and [O2N-O-···+H3N(H2N)C(OH)+···-O-NO2], [-NH3+···-O-P(O)(OH)2] and [C(OH)+···-O-P(O)(OH)2] salt

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22

Said, Mohamed A., Wagdy M. Eldehna, Hazem A. Ghabbour, Maha M. Kabil, Nasser S. Al-shakliah, and Hatem A. Abdel-Aziz. "Solvent-Free Ring Cleavage Hydrazinolysis of Certain Biginelli Pyrimidines." Journal of Chemistry 2018 (2018): 1–6. http://dx.doi.org/10.1155/2018/6354742.

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Certain Biginelli pyrimidines with ester substitution in C5 were subjected to unexpected ring opening upon solvent-free reaction with hydrazine hydrate to give three products: pyrazole, arylidenehydrazines, and urea/thiourea, respectively. The nonisolable carbohydrazide intermediates are formed firstly followed by the intermolecular nucleophilic attack of terminal amino group of hydrazide function on sp2 C6 rather than the sp3 C4 to give the ring adduct which was produced as a final product.

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23

Kantlehner, Willi, Ivo C. Ivanov, and Ioannis Tiritiris. "Orthoamides and Iminium Salts, LXXV [1]. Contribution to the Formation of 2-Formyl-1,1,3,3-tetramethylguanidine and the Isomeric 1,1-Dimethyl-3-dimethylaminomethylene-urea." Zeitschrift für Naturforschung B 67, no. 4 (2012): 331–36. http://dx.doi.org/10.1515/znb-2012-0406.

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2-Formyl-1,1,3,3-tetramethylguanidine (1) could be prepared from tris(dimethylamino)ethoxymethane (3a) and formamide (4). Surprisingly, guanidine 1 does not result from the reaction of 1,1,3,3-tetramethylguanidine with formylating reagents such as dimethylamino-methoxy-acetonitrile (8) or the N,N-dimethylformamide-dimethylsulfate adduct (9), rather the isomeric 1,1-dimethyl-3- dimethylaminomethylene-urea (2) is formed. The structure of 2 was confirmed by NMR spectroscopy and crystal structure analysis.

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24

Smith, Graham, Katherine E. Baldry, Colin H. L. Kennard, and Karl A. Byriel. "The Preparation and Crystal Structure of the 1 : 1 Adduct of Glycine with Urea." Australian Journal of Chemistry 50, no. 7 (1997): 737. http://dx.doi.org/10.1071/c96205.

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The 1 : 1 adduct of the a-amino acid glycine with urea has been prepared and its crystal structure determined by X-ray crystallography and refined to a residual R 0·028 for 776 observed reflections. Crystals are monoclinic, pace group P21 with two molecules in a cell of dimensions a 7·364(1), b 4·8703(2), c 8·494(1) Å, β 98·555(7)°. The polymeric structure is based on a primary cyclic hydrogen-bonded nine-membered ring involving both the carboxyl oxygen and an amino hydrogen of the zwitterionic glycine molecule with the urea amine hydrogen and oxygen respectively. These repeat down the twofold

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25

Smith, Graham, Michael G. Coyne, and Jonathan M. White. "Molecular Cocrystals of Aromatic Carboxylic Acids with 1,1-Diethylurea: Synthesis and the Crystal Structures of a Series of Nitro-Substituted Analogues." Australian Journal of Chemistry 53, no. 3 (2000): 203. http://dx.doi.org/10.1071/ch99173.

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Molecular adducts of 1,1-diethylurea with the nitro-substituted aromatic carboxylic acids 2-nitrobenzoic acid, [(C7H5NO4)(C5H12N2O)] (1), 3-nitrobenzoic acid, [(C7H5NO4)(C5H12N2O)] (2), 4-nitrobenzoic acid, [(C7H5NO4)2(C5H12N2O)] (3), 3,5-dinitrobenzoic acid, [(C7H4N2O6)(C5H12N2O)] (4), 5-nitrosalicylic acid, [(C7H5NO5)(C5H12N2O)] (5) and 3,5-dinitrosalicylic acid, [(C7H4N2O7)(C5H12N2O)] (6), have been prepared and characterized by using infrared spectroscopy, and, in the case of four of these [(1), (4), (5) and (6)], by single-crystal X-ray diffraction methods. In all examples, primary cyclic

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26

Mohammed, Abdul-Halim A. K. Mohammed, and Safaa R. Yasin Yasin. "DEWAXING OF DISTILLATE OIL FRACTION (400- 500 ºC) USING UREA." Journal of Engineering 13, no. 01 (2024): 1268–81. http://dx.doi.org/10.31026/j.eng.2007.01.09.

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De-waxing of lubricating oil distillate (400-500 ºC) by using urea was investigated in the present study. Lubricating oil distillate produced by vacuum distillation and refined by furfural extraction was taken from Al-Daura refinery. This oil distillate has a pour point of 34 ºC. Two solvents were used to dilute the oil distillate, these are methyl isobutyl ketone and methylene chloride. The operating conditions of the urea adduct formation with n-paraffins in the presence of methyl isobutyl ketone were studied in details, these are solvent to oil volume ratio within the range of 0 to 2, mixer

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27

Buryakov, T. I., and I. A. Buryakov. "Detecting trace amounts of peroxides and ammonium nitrate in fingerprints by ion mobility spectrometry." Zhurnal Analiticheskoi Khimii 79, no. 7 (2025): 772–81. https://doi.org/10.31857/s0044450224070093.

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The effect of the sweat and grease deposits (SGD) from fingerprints on the detection efficiency of trace amounts of explosive substances—triacetone triperoxide (TATP), hexamethylene triperoxide diamine (HMTD), and ammonium nitrate (AN) by ion mobility spectrometry in air at atmospheric pressure was investigated. Among the main components of SGD, urea is identified as a positive mode influencer, while lactic acid (LA) affects in a negative mode. The presence of urea or SGD in the sample does not significantly affect the detection of TATP in the positive mode but decreases the efficiency of HMTD

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28

Kozak, A., K. Wieczorek-Ciurowa, and K. Pielichowski. "Investigations on thermal stability of adduct aluminium nitrate(V)-urea (1/6)." Journal of Thermal Analysis 45, no. 5 (1995): 1245–53. http://dx.doi.org/10.1007/bf02547501.

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29

Young, Donald C. "5116401 Herbicide and method with the glyphosate-urea adduct of sulfuric acid." Environment International 19, no. 1 (1993): III. http://dx.doi.org/10.1016/0160-4120(93)90038-j.

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30

Adam, Waldemar, and Catherine M. Mitchell. "Methyltrioxorhenium(VII)-Catalyzed Epoxidation of Alkenes with the Urea/Hydrogen Peroxide Adduct." Angewandte Chemie International Edition in English 35, no. 5 (1996): 533–35. http://dx.doi.org/10.1002/anie.199605331.

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31

Coleman, Mark R., and Daniel H. Mowrey. "Turbidimetric Assay of Tylosin in Animal Feeds Containing Urea." Journal of AOAC INTERNATIONAL 73, no. 6 (1990): 927–31. http://dx.doi.org/10.1093/jaoac/73.6.927.

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Abstract A turbidimetric method Is described for determination of tylosin in animal feeds containing urea. This method Includes several modified or new steps to existing turbidimetric and AOAC plate assays that Improve the extraction of tylosin, remove interferences from feeds, free tylosin activity, concentrate tylosin from low-level feeds, and reduce variability of assay results. A larger analytical sample size has been incorporated Into the assay to decrease variability of assay results. A methanol-phosphate buffer extraction solution has replaced the hot buffer and methanol extraction solu

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32

Xiao, Yong Shan, Li Yu Chen, Run Xia Lu, and Cheng Qian Tang. "Selective Oxidation of Methane to Methanol with Organic Oxidants Catalyzed by Iodine in Non-Aqueous Acetic Acid Medium." Applied Mechanics and Materials 723 (January 2015): 624–28. http://dx.doi.org/10.4028/www.scientific.net/amm.723.624.

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Various organic oxidants including tert-butyl peroxybenzoate, tert-butyl hydroperioxide (TBHP), hydrogen peroxide-urea adduct, dicumyl peroxyide and peracetic acid solution were studied for the oxidation of methane to methanol via methyl acetate catalyzed by iodine in non-aqueous acetic acid medium. Among these organic oxidants investigated, tert-butyl hydroperioxide (TBHP) exhibited the highest methane conversion. The effects of various kinetic factors on the catalytic behavior of the TBHP-I2 system were investigated, and a quantitative yield of methyl acetate (18.9%) based on methane has bee

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33

Balicki, Roman, and Łukasz Kaczmarek. "Mild and Efficient Conversion of Nitriles to Amides with Basic Urea-Hydrogen Peroxide Adduct." Synthetic Communications 23, no. 22 (1993): 3149–55. http://dx.doi.org/10.1080/00397919308011173.

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34

Jeon, Heung Bae, Kyoung Tae Kim, and Sang Hyun Kim. "Selective oxidation of sulfides to sulfoxides with cyanuric chloride and urea–hydrogen peroxide adduct." Tetrahedron Letters 55, no. 29 (2014): 3905–8. http://dx.doi.org/10.1016/j.tetlet.2014.05.080.

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35

Majeed, Zahid, Kiran Khurshid, Zainab Ajab, et al. "Agronomic evaluation of controlled release of micro urea encapsulated in rosin maleic anhydride adduct." Journal of Plant Nutrition 43, no. 12 (2020): 1794–812. http://dx.doi.org/10.1080/01904167.2020.1750637.

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36

Suzuki, Yasuo, Masanori Konno, Kunio Arai, and Shozaburo Saito. "Fractionation of polyunsaturated fatty acids by urea adduct formation using supercritical CO2 as solvent." KAGAKU KOGAKU RONBUNSHU 16, no. 1 (1990): 38–45. http://dx.doi.org/10.1252/kakoronbunshu.16.38.

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37

Indrasena Reddy, T., and Rajender S. Varma. "Ti-beta-catalysed selective oxidation of sulfides to sulfoxides using urea–hydrogen peroxide adduct." Chemical Communications, no. 5 (1997): 471–72. http://dx.doi.org/10.1039/a607832j.

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38

Lagier, Claudia M., David C. Apperley, Ulrich Scheler, Alejandro C. Olivieri, and Robin K. Harris. "Deuterium isotope effects on31P NMR parameters: hydrogen bonding in a solid urea–phosphoric acid adduct." J. Chem. Soc., Faraday Trans. 92, no. 24 (1996): 5047–50. http://dx.doi.org/10.1039/ft9969205047.

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39

Byfield, Mark P., Victoria L. Frost, John L. J. Pemberton, and John M. Pratt. "Evidence for adduct formation in the solubilisation of hydrophobic compounds by aqueous solutions of urea." Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases 85, no. 9 (1989): 2713. http://dx.doi.org/10.1039/f19898502713.

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Loub, J., and M. Dušek. "Crystal data for an adduct of orthotelluric acid and urea, Te(OH)6.2CO(NH2)2." Journal of Applied Crystallography 19, no. 3 (1986): 202. http://dx.doi.org/10.1107/s0021889886089628.

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The crystal data of the title compound have been determined from single-crystal data [Loub, Haase & Mergehenn (1979). Acta Cryst. B35, 3039–3041]: C2/c, a = 14.828(8), b = 8.891(6), c = 10.023(7) Å, β = 129.13(3)°, V = 1025.0(9) Å3, Z = 4, Dm = 2.31(3), Dx = 2.27 Mg m−3. Power data obtained with powder diffractometer, θ–2θ scan, T = 295 K, Cu Kα radiation are presented. Infrared and Raman spectra are given. Thermal decomposition is reported [Fábry, Loub & Feltl (1982). J. Therm. Anal. 24, 95–100]. The JCPDS Diffraction File No. for C2H8N4O2Te(OH)6 is 36-1470.

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Davidson, Matthew G., Avelino Martin, Paul R. Raithby, Ronald Snaith, David R. Armstrong, and Dietmar Stalke. "A 1 : 1 Adduct of 2-Aminobenzothiazole and a Urea Derivative, and Its Spatial Arrangement." Angewandte Chemie International Edition in English 31, no. 12 (1992): 1634–36. http://dx.doi.org/10.1002/anie.199216341.

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42

Jagdish, P., N. P. Rajesh, and S. Natarajan. "Growth and Characterization of Urea Adduct with m-Nitrobenzoic Acid,m-Nitroaniline, and p-Xylene Mixtures." Journal of Minerals and Materials Characterization and Engineering 09, no. 05 (2010): 471–81. http://dx.doi.org/10.4236/jmmce.2010.95033.

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Jeon, Heung Bae, Kyoung Tae Kim, and Sang Hyun Kim. "ChemInform Abstract: Selective Oxidation of Sulfides to Sulfoxides with Cyanuric Chloride and Urea-Hydrogen Peroxide Adduct." ChemInform 45, no. 51 (2014): no. http://dx.doi.org/10.1002/chin.201451101.

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REDDY, T. I., and R. S. VARMA. "ChemInform Abstract: Ti-beta-Catalyzed Selective Oxidation of Sulfides to Sulfoxides Using Urea-Hydrogen Peroxide Adduct." ChemInform 28, no. 27 (2010): no. http://dx.doi.org/10.1002/chin.199727057.

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Boehlow, Todd R., and Christopher D. Spilling. "The regio- and stereo- selective epoxidation of alkenes with methyl trioxorhenium and urea-hydrogen peroxide adduct." Tetrahedron Letters 37, no. 16 (1996): 2717–20. http://dx.doi.org/10.1016/0040-4039(96)00423-6.

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Czauderna, M., and J. Kowalczyk. " Simple, selective, and sensitive measurement of urea in body fluids of mammals by reversed-phase ultra-fast liquid chromatography." Czech Journal of Animal Science 57, No. 1 (2012): 19–27. http://dx.doi.org/10.17221/5480-cjas.

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Ultra-fast liquid chromatography with a photodiode array detector for simple and rapid determination of urea in body fluids of farm animals is described. Blood plasma, milk, and urine samples are treated with trichloroacetic acid and then centrifuged. Supernatants are derivatized at room temperature using p-dimethylaminobenzaldehyde. Samples are separated using a ternary gradient of methanol in buffer and water. Derivatized urea in standards and biological samples is analyzed using a Phenomenex C<sub>18</sub>-column (Synergi 2.5 &micro;m, Hydro-RP, 100&Aring;, 100 &time

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Matishev, V. A. "Periodic system of homologous series of normal aliphatic hydrocarbons and compounds forming adducts with urea at temperatures of the upper limit of adduct formation." Chemistry and Technology of Fuels and Oils 31, no. 2 (1995): 80–87. http://dx.doi.org/10.1007/bf00730937.

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Adam, Waldemar, Catherine M. Mitchell, Chantu R. Saha-Möller, and Oliver Weichold. "Host−Guest Chemistry in a Urea Matrix: Catalytic and Selective Oxidation of Triorganosilanes to the Corresponding Silanols by Methyltrioxorhenium and the Urea/Hydrogen Peroxide Adduct." Journal of the American Chemical Society 121, no. 10 (1999): 2097–103. http://dx.doi.org/10.1021/ja9826542.

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Smith, Graham, Urs D. Wermuth, and Peter C. Healy. "The 1/1/1 adduct hydrate of 8-hydroxy-7-iodoquinoline-5-sulfonic acid (ferron) with urea." Acta Crystallographica Section E Structure Reports Online 60, no. 6 (2004): o1040—o1042. http://dx.doi.org/10.1107/s1600536804011274.

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Saluja, Pooja, Devanshi Magoo, and Jitender M. Khurana. "Lanthanum Triflate–Catalyzed Rapid Oxidation of Secondary Alcohols Using Hydrogen Peroxide Urea Adduct (UHP) in Ionic Liquid." Synthetic Communications 44, no. 6 (2014): 800–806. http://dx.doi.org/10.1080/00397911.2013.831904.

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