Search Results for "Protonation Amide In Ms Esi"
Original Source: A study of fragmentation of protonated amides of some acylated amino acids by tandem mass spectrometry: observation of an unusual nitrilium ion.
A tandem mass spectrometric study of a series of secondary amides of acetylglycine and hippuric acid utilizing electrospray ionization (ESI) was conducted. Among the fragment ions observed was an unusual one, which we have determined to be a nitrilium ion having the structure CH3-C≡N⊕-Ph or Ph-C≡N⊕-Ph by loss of the full mass of glycine as a neutral fragment. A mechanism that we propose involves an initial protonation of the oxygen atom at the N-terminus, followed by cyclization to a five-membered...
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Ammonia formation by a thiolate-bridged diiron amide complex as a nitrogenase mimic
Although it is achieved routinely by nitrogenases, the conversion of molecular dinitrogen into ammonia under ambient conditions is proving difficult with synthetic systems. A thiolate-bridged diiron c...
Aesica Accesses Atom-Efficient Amide Tech in Academic Accord
Making amide bonds may be greener and cheaper in the future according to Aesica, which has partnered with UK scientists to commercialize a new synthesis technique.
Aesica, University of Nottingham to develop novel amide chemical synthesis technique
Aesica, a global contract manufacturing organization, has formed a partnership with the University of Nottingham for the commercial development of alternative methods in amide bond synthesis.
Aesica and University of Nottingham to develop novel amide chemical synthesis method
Contract manufacturing organisation Aesica has formed a partnership with the University of Nottingham for the commercial development of alternative methods in amide bond synthesis. The partnership has...
Aesica forms partnership with University of Nottingham
To develop novel amide chemical synthesis techniques
A stand-alone adenylation domain forms amide bonds in streptothricin biosynthesis
Mapping human brain fatty acid amide hydrolase activity with PET
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The effect of protonation on amino acid monomers and protein phosphorylation was studied by means of a combination of Raman scattering and Raman optical activity (ROA). In the past, identifying spectr...
Proton-coupled electron shuttling in a covalently linked ruthenium-copper heterodinuclear complex.
A heterodinuclear complex based on a Ru(II)-TPA [TPA = tris(2-pyridylmethyl)amine] complex having a peripheral Cu(II)(bpy)(2) (bpy = 2,2'-bipyridine) group bonded through an amide linkage displayed re...
Protonation and ion exchange equilibria of weak base anion-exchange resins.
Protonation and ion exchange equilibria of weak base anion-exchange resins, in which tertiary amine moieties were introduced as a functional group, were investigated by applying NMR spectroscopy to sp...
This investigation examines the protonation of diiron dithiolates, exploiting the new family of exceptionally electron-rich complexes Fe(2)(xdt)(CO)(2)(PMe(3))(4), where xdt is edt (ethanedithiolate,...
Amide Vibrations and Their Conformational Dependences in β-Peptide.
The characteristics of the amide-A and amide-I modes in a β-homoalanine dipeptide (β-HADP) have been examined as a function of backbone dihedral angles. The harmonic frequencies were obtained using...
