Deep insights into the hydrolysis of N,N -dialkylaminoethyl methacrylates in aqueous solution with 1 H NMR spectroscopy

2018 ◽  
Vol 56 (12) ◽  
pp. 914-923
Author(s):  
Pengfei Zheng ◽  
Xin Su ◽  
Chenhong Fei ◽  
Xiaohuo Shi ◽  
Hongyao Yin ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Nmr Spectroscopy ◽  
H Nmr ◽  
Hydrolysis Of

Cucurbit[7]uril host-guest complexes with cationic bis(4,5-dihydro-1H-imidazol-2-yl) guests in aqueous solution

2006 ◽  
Vol 84 (6) ◽  
pp. 905-914 ◽  
Author(s):  
D Saroja N Hettiarachchi ◽  
Donal H Macartney
Keyword(s):  
Mass Spectrometry ◽  
Aqueous Solution ◽  
Nmr Spectroscopy ◽  
Stability Constants ◽  
Electrospray Mass Spectrometry ◽  
Hydrophobic Core ◽  
Guest Complex ◽  
H Nmr ◽  
Host Guest Complex ◽  
Proton Resonances

The host–guest interactions between cucurbit[7]uril and a series of novel cationic bis(4,5-dihydro-1H-imidazol-2-yl)arene and 1-(4,5-dihydro-1H-imidazol-2-yl)- and 1,3-bis(4,5-dihydro-1H-imidazol-2-yl)-adamantane guests have been investigated in aqueous solution using UV–vis and NMR spectroscopy, and electrospray mass spectrometry. With the exception of the 1,3-bis(4,5-dihydro-1H-imidazol-2-yl)adamantane (which binds externally to the CB[7]), these guests form very stable inclusion complexes with slow exchange on the 1H NMR timescale. The direction and magnitude of the complexation-induced shifts (CIS) in the proton resonances of the guests are indicative of the residence of the hydrophobic core of the guest within the CB[7] cavity and the charged 4,5-dihydro-1H-imidazol-2-yl units outside the cavity adjacent to the carbonyl-lined portals of the host. The CIS values and the inclusion stability constants have been correlated with the nature of the guest core and with the distance between the charges on the terminal 4,5-dihydro-1H-imidazol-2-yl rings.Key words: cucurbit[7]uril, host–guest complex, dihydroimidazolyl, inclusion stability constants.

NMR-spektroskopische Untersuchungen zur Hydrolyse von funktionellen Trialkoxysilanen/ NMR-Spectroscopic Investigations on the Hydrolysis of Functional Trialkoxysilanes

1999 ◽  
Vol 54 (2) ◽  
pp. 155-164 ◽  
Author(s):  
Marcus Brand ◽  
Albert Frings ◽  
Peter Jenkner ◽  
Robert Lehnert ◽  
Hans Jürgen Mettemich ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Functional Groups ◽  
Reaction Rates ◽  
First Order ◽  
H Nmr ◽  
Spectroscopic Investigations ◽  
Influence Of Ph ◽  
Hydrolysis Of ◽  
Silane Concentration ◽  
Size And Structure

The hydrolysis of functional trialkoxysilanes was studied under various conditions by 1H NMR spectroscopy. The silane concentration was 1 - 2% by weight in a water/acetonesystem. Under these conditions, the reaction was found to be first order. In detail, influence of pH, grade of stirring, and size and structure of functional groups of the alkyltrialkoxysilanes were investigated in order to compare the relative reaction rates of the different compounds.

scholarly journals Alkyl substituted 4-pyrrolidinopyridinium salts encapsulated in the cavity of cucurbit[10]uril

2019 ◽  
Vol 43 (18) ◽  
pp. 7028-7034 ◽  
Author(s):  
Weitao Xu ◽  
Ming Liu ◽  
Mary Clare Escaño ◽  
Carl Redshaw ◽  
Bing Bian ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Aqueous Solution ◽  
Nmr Spectroscopy ◽  
Absorption Spectroscopy ◽  
Electronic Absorption ◽  
Electronic Absorption Spectroscopy ◽  
H Nmr ◽  
Pyridinium Nitrogen

The interaction between cucuribit[10]uril (Q[10]) and a series of 4-pyrrolidinopyridinium salts bearing aliphatic substituents at the pyridinium nitrogen, namely 4-(C4H8N)C5H5NRBr, where R = Et (g1), n-butyl (g2), n-pentyl (g3), n-hexyl (g4), n-octyl (g5), n-dodecyl (g6), has been studied in aqueous solution by 1H NMR spectroscopy, electronic absorption spectroscopy and mass spectrometry.

scholarly journals Reaktion des Orthovanadinsäure-tri-tert-butylesters mit Monocarbonsäuren / Reaction of Tris-tert-butylorthovanadate with Monocarboxylic Acids

1979 ◽  
Vol 34 (2) ◽  
pp. 163-171 ◽  
Author(s):  
Fritz Preuss ◽  
Joachim Woitschach
Keyword(s):  
Reaction Mechanism ◽  
Nmr Spectroscopy ◽  
Chemical Reactions ◽  
Carboxyl Groups ◽  
Partial Hydrolysis ◽  
Bidentate Ligands ◽  
Monocarboxylic Acids ◽  
H Nmr ◽  
Hydrolysis Of

Abstract Tris-tert-butylorthovanadate VO(OC4H9)3 undergoes reaction with monocarboxylic acids to yield monomeric VO(OC4H9)(RCOO)2; no VO(OC4H9)2(RCOO) or VO(RCOO)3 could be isolated from the reaction mixture. Polymeric dioxovanadium(V)-monocarbox-ylates(VO2RCOO)n are formed by thermolysis or partial hydrolysis of VO(OC4H9)(RCOO)2; the reaction mechanism is studied and discussed. Syntheses of Ba[VO2(CH3COO)3], Ba[VO2(C2H5COO)3] and N(C4H9)4[V4O8Br(CH3COO)4] are described. All compounds obtained are characterized by IR and 1H NMR spectroscopy as well as by chemical reactions. The carboxyl groups are mostly acting as bidentate ligands.

Comparative analysis of the self-association of ethidium mono- and bis-intercalators in aqueous solution using 1H NMR spectroscopy

2004 ◽  
Author(s):  
Maxim P. Evstigneev ◽  
Adrian A. Hernandez Santiago ◽  
Olga V. Rogova ◽  
Alexei N. Veselkov
Keyword(s):  
Aqueous Solution ◽  
Comparative Analysis ◽  
Nmr Spectroscopy ◽  
The Self ◽  
H Nmr ◽  
Self Association

Kinetic Study on P-Nitrophenyl Picolinate Hydrolysis Promoted by the Complex Bis(O,O'-Di(2-Benzyl)Dithiophosphato)Nickel(Ii)

2009 ◽  
Vol 34 (3) ◽  
pp. 249-260 ◽  
Author(s):  
Jiaqing Xie ◽  
Bin Xie ◽  
Fa-Mei Feng ◽  
Li-Ke Zou ◽  
Jian-Shen Feng
Keyword(s):  
Mathematical Model ◽  
Nmr Spectroscopy ◽  
Ir Spectroscopy ◽  
Elemental Analysis ◽  
Catalytic Hydrolysis ◽  
Efficient Catalyst ◽  
Reaction Systems ◽  
H Nmr ◽  
Hydrolytic Reaction ◽  
Hydrolysis Of

The complex Ni[S2P(OCH2Ph)2]2 (MR) was synthesised and characterised by elemental analysis, IR spectroscopy and 1H NMR spectroscopy. The hydrolysis of p-nitrophenyl picolinate (PNPP) as promoted by this complex was investigated by the UV-vis method, the results showing that MR acts as a very efficient catalyst. The specific absorption spectra of the hydrolytic reaction systems indicated that the key intermediate, made up of PNPP and MR was formed during reaction. Based on these spectra, a mechanism for the catalytic hydrolysis of PNPP has been proposed and a kinetic mathematical model established.

Complexations of the hydrophilic and hydrophobic moieties of benzethonium chloride by cucurbit[7]uril in aqueous solution

2012 ◽  
Vol 90 (10) ◽  
pp. 851-857 ◽  
Author(s):  
Brendan C. MacGillivray ◽  
Donal H. Macartney
Keyword(s):  
Mass Spectrometry ◽  
Aqueous Solution ◽  
Nmr Spectroscopy ◽  
Stability Constant ◽  
Guest Molecule ◽  
Ionization Mass ◽  
H Nmr ◽  
Benzethonium Chloride ◽  
End Groups ◽  
Initial Binding

The sequential complexations of the hydrophilic and hydrophobic end groups of benzethonium chloride by cucurbit[7]uril (CB[7]) in aqueous solution have been investigated using 1H NMR spectroscopy and electrospray ionization mass spectrometry. The initial binding is to the benzyldimethylammonium group, with a stability constant of (8.7 ± 3.1) × 107 (mol/L)–1. This binding constant and the complexation-induced upfield shifts of the benzyl guest protons are similar to those values observed with other cationic guests containing benzyl moieties. This equilibrium is followed by the binding of a second equivalent of the host to the hydrophobic 2-(2,4,4-trimethylpentyl) group, with a stability constant of (4.0 ± 1.9) × 103 (mol/L)–1. The relatively strong binding of this uncharged hydrophobic end of the guest molecule is consistent with the inclusion of eight heavy (nonhydrogen) atoms within the inner cavity of CB[7], with its low polarizability. The packing coefficient for the 2-(2,4,4-trimethylpentyl) group with the inner cavity is calculated to be 61%, close to Rebek’s ideal value of 55%.

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