scholarly journals Impacts of Steric Compression, Protonation, and Intramolecular Hydrogen Bonding on the 15N NMR Spectroscopy of Norditerpenoid Alkaloids and Their Piperidine-Ring Analogues

ACS Omega ◽  
2020 ◽  
Vol 5 (23) ◽  
pp. 14116-14122 ◽  
Author(s):  
Ziyu Zeng ◽  
Ashraf M. A. Qasem ◽  
Timothy J. Woodman ◽  
Michael G. Rowan ◽  
Ian S. Blagbrough
Keyword(s):  
Hydrogen Bonding ◽  
Nmr Spectroscopy ◽  
Intramolecular Hydrogen Bonding ◽  
Piperidine Ring ◽  
15N Nmr ◽  
Norditerpenoid Alkaloids ◽  
15N Nmr Spectroscopy ◽  
Intramolecular Hydrogen

Structural and Spectral Studies of Palladium (II) Complexes of Pyridil bis{3-Piperidyl-, bis{Hexamethyleneiminyl-, bis{N(4)-Diethyl- and bis{N(4)-Dipropylthiosemicarbazone}

2000 ◽  
Vol 55 (9) ◽  
pp. 863-870 ◽  
Author(s):  
Alfonso Castiñeiras ◽  
Maria Gil ◽  
Elena Bermejo ◽  
Douglas X. West
Keyword(s):  
Hydrogen Bonding ◽  
Nmr Spectroscopy ◽  
Intramolecular Hydrogen Bonding ◽  
Isomeric Form ◽  
Spectral Studies ◽  
Imine Nitrogen ◽  
Pyridine Nitrogen ◽  
Square Planar ◽  
Intramolecular Hydrogen ◽  
C Nmr

Pyridil bis{N(4)-substituted thiosemicarbazones}, in which the substituents replacing the NH2 group on the thiosemicarbazone moieties are piperidyl, H2Plpip; hexamethyleneiminyl, H2Plhexim; diethylamino, H2Pl4DE; and dipropylamino, H2PI4 DP, have been synthesized. Representative palladium(II) complexes of these bis (thiosemicarbazones) have been characterized by IR, electronic, mass, and 1H and 13C NMR spectroscopy. Crystal structures have been determined for H2Plhexim and two of its palladium(II) complexes. H2Plhexim is in the Z isomeric form with intramolecular hydrogen bonding from both thiosemicarbazone moieties to pyridine nitrogens. [Pd(Plhexim)] has square-planar N2S2 coordination (i.e., imine nitrogen and thiolato sulfur atoms). [Pd2 (Plhexim)Cl2 · DMSO has two PdNNSCl centers with the pyridine nitrogen, imine nitrogen or hydrazinic nitrogen and thiolato sulfur atoms coordinated

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