A new diaza heteroaromatic crown of 3,5-disubstituted 1H-pyrazole which forms solid dinuclear complexes with lipophilic phenethylamines
Article Abstract:
A diaza heteroaromatic crown of 3,5-disubstituted 1H-pyrazole has been synthesized for the first time. It forms solid dinuclear complexes with lipophilic phenethylamines, which gives it implications related to psychedelic drugs. The cyclic stannoxane that is made from N-methyldiethanolamine and dibutyltin oxide can be reacted with 1H-pyrazole-3,5-dicarbonyl dichloride to yield a new diaza tetraester crown that is 26-membered. The crown forms 1:2 solid dinuclear complexes with phenethylamine and homoveratrylamine in neutral medium. After crystallization from acetonitrile, the complexes were isolated in high yield. Total interaction energies calculated for the homoveratrylamine-derived complex and the phenethylamine-derived complex indicate that the o-dimethoxy substitution of the guest aromatic ring may improve the stability of the former relative to the latter.
Publication Name: Canadian Journal of Chemistry
Subject: Chemistry
ISSN: 0008-4042
Year: 1998
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31P chemical shift anisotropies of trimethyl- and triphenylphosphine-substituted Group 6 metal pentacarbonyl complexes
Article Abstract:
The 31P chemical shift anisoptropies and tensor components of triphenyl- and trimethylphosphine complexes of the group 6 metal pentacarbonyl, M(CO)5PR3, where M may be W, Mo, or Cr and R may be Me or Ph, have been measured through use of solid-state CP-MAS 31P NMR spectroscopy. For the trimethylphosphine derivatives, the shift tensor components are in fairly good agreement with the calculated values for the molybdenum and chromium complexes and chemical shift tensors have close to axial symmetry.
Publication Name: Canadian Journal of Chemistry
Subject: Chemistry
ISSN: 0008-4042
Year: 1998
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Adhesion to dentin: studies of surface chemical reactions towards the goal of improved bonding
Article Abstract:
Adhesion to dentin has been studied as part of an investigation of surface chemical reactions with the goal of improving dental bonding. Human dentin, to which it is important to bond materials in dentistry, is made up of protein parts and mineral parts forming a collagen network that is reinforced with apatite. Surface-sensitive instrumentation has been used to look into the nature of various surface treatments of dentin.
Publication Name: Canadian Journal of Chemistry
Subject: Chemistry
ISSN: 0008-4042
Year: 1998
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