Urea, thiourea and guanidine derivatives as multifunctional fuel stabilisers

Juyal, Priyanka; Anand, O. N.

doi:10.1016/s0016-2361(02)00118-7

Cited by 8 publications

(4 citation statements)

References 7 publications

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“…13,14 The weak peak at about 3080 cm -1 is attributed to the stretching vibration modes of the N-H, suggesting the existence of N-H groups in resin structure. 15,16 These N-H groups may come from a side reaction between urea and isobutyraldehyde to give 1,3-bis-hydroxyisobutyl-urea, in which there are N-H, which cannot easily be washed away.…”

Section: Ftirmentioning

confidence: 99%

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Synthesis and structural characterization of urea–isobutyraldehyde–formaldehyde resins

2008

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Urea-isobutyraldehyde-formaldehyde (UIF) resins were synthesized using urea, isobutyraldehyde, and formaldehyde; sulfuric acid was used as a catalyst. The effects of molar ratio of urea/isobutyraldehyde/ formaldehyde (U/I/F) on the properties of resins were investigated, and the structures of the resins were characterized by FTIR, 1 H-NMR, and 13 C-NMR. When U/I/F was 1.0/3.6/2.4, the yield of the resin was 76.5%. The softening point and hydroxyl value were 90°C and 32 mg KOH/g, respectively. The FTIR, 1 H-NMR, and 13 C-NMR results showed that an a-ureidoalkylation reaction occurred between urea and isobutyraldehyde to form a lactam. The UIF resins also contained hydroxyl groups and aldehyde groups; the content of aldehyde groups in the resin increased as the amount of isobutyraldehyde increased.

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Section: Ftirmentioning

confidence: 99%

“…15,16 The peaks at 1391 and 1368 cm -1 are assigned to the symmetric deforming vibration of C-H bonds in the -CH(CH 3 ) 2 and >C(CH 3 ) 2 groups. Peaks at 1215 and 1188 cm -1 are attributed to the deforming vibration of carbon framework in the >C(CH 3 ) 2 groups, indicating the presence of gem-dimethyl structure.…”

Section: Ftirmentioning

confidence: 99%

Synthesis and structural characterization of urea–isobutyraldehyde–formaldehyde resins

2008

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“…Three classic chaotropic agents commonly used to denature proteins are urea, sodium perchlorate, and guanidinium chloride (GdmCl), and although the diffusion coefficients of urea and sodium perchlorate are both well-known, , the diffusion of the GdmCl salt has yet to be measured experimentally. GdmCl diffusion coefficients have been computed from molecular simulations with GdmCl solvated in a variety of water models, namely, SPC/E, SPC, and TIP3P water, but no values exist however for the arguably superior TIP4P and TIP4P-Ew water models or for models incorporating ethanolboth aqueous and water−ethanol solutions of GdmCl have been used to induce protein unfolding. , GdmCl is also used in nucleic acid purification and microfluidic nucleic acid probe assays, and substituted guanidines are used as fuel stabilizers; all of these applications will benefit from a deeper knowledge of GdmCl diffusion.…”

Section: Introductionmentioning

confidence: 99%

“…GdmCl diffusion coefficients have been computed from molecular simulations with GdmCl solvated in a variety of water models, namely, SPC/E, SPC, and TIP3P water, 14 but no values exist however for the arguably superior 15 TIP4P and TIP4P-Ew water models or for models incorporating ethanolsboth aqueous and water-ethanol solutions of GdmCl have been used to induce protein unfolding. 16,17 GdmCl is also used in nucleic acid purification 18 and microfluidic nucleic acid probe assays, 19 and substituted guanidines are used as fuel stabilizers; 20 all of these applications will benefit from a deeper knowledge of GdmCl diffusion.…”

Section: Introductionmentioning

confidence: 99%

Guanidinium Chloride Molecular Diffusion in Aqueous and Mixed Water−Ethanol Solutions

Gannon¹,

Larsson²,

Greer³

et al. 2008

J. Phys. Chem. B

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Solutions containing guanidinium chloride (GdmCl), or equivalently guanidine hydrochloride (GdnHCl), are commonly used to denature macromolecules such as proteins and DNA in, for example, microfluidics studies of protein unfolding. To design and study such applications, it is necessary to know the diffusion coefficients for GdmCl in the solution. To this end, we use molecular dynamics simulations to calculate the diffusion coefficients of GdmCl in water and in water-ethanol solutions, for which no direct experimental measurements exist. The fully atomistic simulations show that the guandinium cation Gdm (+) diffusion decreases as the concentration of both Gdm (+) and ethanol in the solution increases. The simulations are validated against available literature data, both transformed measured viscosity values and computed diffusion coefficients, and we show that a prudent choice of water model, namely TIP4P-Ew, gives calculated diffusion coefficients in good agreement with the transformed measured viscosity values. The calculated Gdm (+) diffusion behavior is explained as a dynamic mixture of free cation, stacked cation, and ion-paired species in solution, with weighted contributions to Gdm (+) diffusion from the stacked and paired states helping explain measured viscosity data in terms of atom-scale dynamics.

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Conversion of nitrogenous small molecules into value-added chemicals by building N–C bonds

Zhang,

Yu,

Wang

et al. 2023

Chemical Engineering Journal

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Urea, thiourea and guanidine derivatives as multifunctional fuel stabilisers

Cited by 8 publications

References 7 publications

Synthesis and structural characterization of urea–isobutyraldehyde–formaldehyde resins

Synthesis and structural characterization of urea–isobutyraldehyde–formaldehyde resins

Guanidinium Chloride Molecular Diffusion in Aqueous and Mixed Water−Ethanol Solutions

Conversion of nitrogenous small molecules into value-added chemicals by building N–C bonds

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