1H NMR spectra of some juvabione analogues

1985 ◽  
Vol 50 (3) ◽  
pp. 690-696
Author(s):  
R. K. Mahajan ◽  
Neelam Gupta ◽  
Satinder K. Uppal
Keyword(s):  
1H Nmr ◽  
Nmr Spectra ◽  
1H Nmr Spectra ◽  
H Nmr

A number of aromatic aza-analogues of juvabione and dehydrojuvabione have been synthetized by treatment of substituted benzylamine with 3-methylbutanoyl chloride and 3-methyl-2-butenoyl chloride. Reaction of substituted phenoxyacetyl chlorides with isopropylamine and 2-propanol gives other series of aromatic juvabione analogues. The 1H NMR spectra of some analogues are discussed.

scholarly journals 13C and 1H NMR Spectra of Synthetic (25R)-5α-Spirostanes

1999 ◽  
Vol 23 (1) ◽  
pp. 48-49
Author(s):  
Martín A. Iglesias Arteaga ◽  
Carlos S. Pérez Martinez ◽  
Roxana Pérez Gil ◽  
Francisco Coll Manchado
Keyword(s):  
1H Nmr ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
1H Nmr Spectra ◽  
H Nmr ◽  
C 23 ◽  
Main Effects ◽  
Nmr Signals

The assignment of 13C and 1H NMR signals of synthetic (25 R)-5α-spirostanes is presented; the main effects on chemical shifts due to substitution at C-23 are briefly discussed.

The 1H-NMR Spectra of the Biflavones Isocryptomerin and Cryptomerin B - a Critical Comment on Two Recent Publications on the Biflavone Patterns of Selaginella selaginoides and S. denticulata

1996 ◽  
Vol 51 (9-10) ◽  
pp. 757-758 ◽  
Author(s):  
Hans Geiger ◽  
Kenneth R. Markham
Keyword(s):  
1H Nmr ◽  
Nmr Spectra ◽  
Critical Comment ◽  
1H Nmr Spectra ◽  
Current Paper ◽  
Published Data ◽  
Supportive Evidence ◽  
H Nmr ◽  
Nmr Data

Two recent reports from another laboratory on hinokiflavone and robustaflavone in S. selaginoides, and hinokiflavone, isocryptom erin, cryptomerin B and amentoflavone 7-methylether in S. denticulata are shown to be based on 1H -NMR data that are inconsistent with the biflavone structures proposed. In the current paper a comparison of the 1H -nmr spectra is made both with published data and with new data derived from authentic samples. It is concluded that in both reports, only for am entoflavone the NMR data provide convincing supportive evidence. These reports are considered therefore to merely confirm an earlier identification of am entoflavone in these species

Structure of sodium tetracaprolactamatoaluminate. 1H NMR spectra of sodium isobutylcaprolactamatoaluminates

1983 ◽  
Vol 48 (10) ◽  
pp. 2728-2734 ◽  
Author(s):  
Otomar Kříž ◽  
Jiří Fusek ◽  
Bohuslav Čásenský
Keyword(s):  
Molecular Weight ◽  
1H Nmr ◽  
Nmr Spectra ◽  
Benzene Solution ◽  
Sodium Atom ◽  
1H Nmr Spectra ◽  
H Nmr

Sodium tetracaprolactamatoaluminate (I) exists in benzene solution predominantly as a dimer. Its structure was proposed on the basis of molecular weight studies, infrared, and 1H NMR spectra of sodium isobutylcaprolactamatoaluminates (II). Two modes of dimerization are supposed: an eight-membered cyclic caprolactam bridge between two aluminum atoms or the coordination of the caprolactam ligands belonging to two different aluminum atoms to one sodium atom.

Synthesis, IR and 1H NMR spectra of N,N,N',N'-tetraalkyl-1,6-hexanediamine dioxides

1979 ◽  
Vol 44 (3) ◽  
pp. 773-780 ◽  
Author(s):  
Ferdinand Devínský ◽  
Ivan Lacko ◽  
Ľudovít Krasnec
Keyword(s):  
1H Nmr ◽  
Nmr Spectra ◽  
Alkyl Chain ◽  
1H Nmr Spectra ◽  
H Nmr

The report describes preparation of N,N'-dimethyl-1,6-hexanediamine, N,N'-bis(alkylmethyl)-1,6-hexanediamines, N-alkyl-N,N'-dimethyl-1,6-hexanediamines, N,N'-bis(alkylmethyl)-1,6-hexanediamine dioxides, N-alkyl-N,N',N'-trimethyl-1,6-hexanediamines and N-alkyl-N,N',N'-trimethyl-1,6-hexanediamine dioxides. In the case of the dioxides IR and 1H NMR spectra are given. In all the cases the alkyl chain is linear and contains 4 to 16 carbon atoms.

15N, 13C, and 1H NMR spectra of acylated ureas and thioureas

1987 ◽  
Vol 52 (10) ◽  
pp. 2474-2481 ◽  
Author(s):  
Josef Jirman ◽  
Antonín Lyčka
Keyword(s):  
1H Nmr ◽  
Electron Acceptor ◽  
Sulfur Atom ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
1H Nmr Spectra ◽  
Coupling Constants ◽  
Nmr Chemical Shifts ◽  
H Nmr ◽  
Better Than

A series of 1-acylated and 1,3-diacylated (acyl = acetyl or benzoyl) ureas and thioureas have been prepared and their proton-coupled and proton-decoupled 15N, 13C, and 1H NMR spectra have been measured. All the signals have been assigned. The 15N NMR chemical shifts in 1-acylated ureas and thioureas are shifted downfield as compared with δ(15N) of urea and thiourea, resp. This shift is greater for N-1 than for N-3 nitrogen atoms in both the series. When comparing acylureas and acylthioureas it is obvious from the Δδ(15N) differences that the CS group is better than CO group in transferring the electron-acceptor effect of acyl group. The proton-coupled 15N NMR spectra of the acylureas dissolved in hexadeuteriodimethyl sulphoxide exhibit a doublet of NH group and a triplet of NH2 group at 25 °C. At the same conditions the acylthioureas exhibit a doublet of NH group, the NH2 group signal being split into a doublet of doublets with different coupling constants 1J(15N, H). The greater one of these coupling constants is due to the s-trans proton with respect to the sulfur atom of the thiourea.

Synthesis and 1H NMR Spectra of Thiophenoyl-, Furoyl- and Pyrroylureas with Antiviral Properties

1975 ◽  
Vol 30 (7-8) ◽  
pp. 600-602 ◽  
Author(s):  
D. G. O’Sullivan ◽  
A. K. Wallis
Keyword(s):  
Antiviral Activity ◽  
1H Nmr ◽  
Nmr Spectra ◽  
1H Nmr Spectra ◽  
H Nmr ◽  
Methyl Derivatives

N-(2-Thiophenoyl)urea, its 5-chloro and 5-methyl derivatives, N-ethyl-N′-(2-thiophenoyl)urea, N-phenyl-N′-(5-methyl-2-thiophenoyl)urea, N-(2-furanoyl)urea, N-(1-methyl-2-pyrroyl)urea and 5-methyl-2-thiophene-carboxamide have been prepared. The 1H NMR spectra of the ureides have been analysed. These ureides show antiviral activity.

15N, 13C, and 1H NMR spectra of 1-substituted-2,4,6-trinitrobenzenes

1987 ◽  
Vol 52 (12) ◽  
pp. 2946-2952 ◽  
Author(s):  
Antonín Lyčka ◽  
Vladimír Macháček ◽  
Josef Jirman
Keyword(s):  
1H Nmr ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
1H Nmr Spectra ◽  
H Nmr

The 15N, 13C, and 1H NMR spectra of twenty 1-substituted-2,4,6-trinitrobenzenes have been measured in hexadeuteriodimethyl sulphoxide. The δ(15N) chemical shifts of 2-NO2 and 6-NO2 groups are different from those of 4-NO2 group. Except for 1-(4-subst. phenoxy)derivatives, the δ(15N-4) are shifted upfield as compared with δ(15N-2,6). The assignment of signals in the 15N NMR spectra was confirmed in three cases by measurements of selectively 15N-labelled compounds.

Isolation of (23R) 3α, 7α,23-trihydroxy-5β-cholan-24-oic (β-phocaecholic) acid from duck bile. 1H NMR spectra of its derivatives

1986 ◽  
Vol 51 (8) ◽  
pp. 1722-1730 ◽  
Author(s):  
Jiří Klinot ◽  
Milan Jirsa ◽  
Eva Klinotová ◽  
Karel Ubik ◽  
Jiří Protiva
Keyword(s):  
Bile Acid ◽  
Methyl Ester ◽  
1H Nmr ◽  
Marine Mammals ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
1H Nmr Spectra ◽  
Methyl Groups ◽  
H Nmr ◽  
Derivatives Of

(23R) 3α, 7α,23-Trihydroxy-5β-cholan-24-oic acid (IV) - a bile acid typical of some marine mammals - was now isolated from duck bile. Acid IV was characterized as derivatives V - VIII, XI and XII and oxidatively degraded to derivatives of 24-nor-5β-cholan-23-oic acid, XIII - XVIII. The 1H NMR spectra of these compounds and (23S) methyl ester X are discussed and the effect of substitution in position 23 on the chemical shifts of the methyl groups is summarized.

Effect of medium on 1H-NMR spectra

1981 ◽  
Vol 46 (7) ◽  
pp. 1549-1553 ◽  
Author(s):  
Vojtěch Bekárek ◽  
Vilém Šimánek
Keyword(s):  
Refractive Index ◽  
1H Nmr ◽  
Relative Permittivity ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
1H Nmr Spectra ◽  
H Nmr ◽  
Induced Changes

1H NMR spectra of benzene, salicylaldehyde, 2-nitroaniline, 4-nitroaniline and 4-aminotoluene have been measured in 13 solvents. The solvent-induced changes in chemical shifts of the proton signals of these compounds have been correlated with refractive index and relative permittivity (D) by the Rummens equation extended by the term f(D) = ((D - 1)/(2D + 1))2.

scholarly journals Diagnostically analyzing 1H NMR spectra of sub-types in chaetoglobosins for dereplication

RSC Advances ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 1946-1955 ◽  
Author(s):  
Chen Lin ◽  
Jian-chun Qin ◽  
Yong-gang Zhang ◽  
Gang Ding
Keyword(s):  
Chemical Shift ◽  
1H Nmr ◽  
Nmr Spectra ◽  
Diagnostic Information ◽  
1H Nmr Spectra ◽  
Coupling Constants ◽  
H Nmr

1H-NMR spectra provide abundant diagnostic information including chemical shift values, splitting patterns, coupling constants, and integrals.

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