Synthesis and dynamic stereochemistry of 1,5-disubstituted 2,3,4,5-tetrahydro-1H-1,5-benzodiazepin-2-ones

1986 ◽  
Vol 22 (2) ◽  
pp. 206-210
Author(s):  
B. A. Puodzhyunaite ◽  
R. A. Yanchene ◽  
Z. A. Stumbryavichyute ◽  
P. P. Mikul'skis
Keyword(s):  
Dynamic Stereochemistry

Stereochemistry of Planarchiral Compounds, 11. Static and dynamic stereochemistry of 10,10′-dibromo-2,2′-bi(1,6-methano[10]annulenyl)

1988 ◽  
Vol 121 (5) ◽  
pp. 917-922 ◽  
Author(s):  
Axel Meyer ◽  
Karl Schlögl ◽  
Ulrike Lerch ◽  
Emanuel Vogel
Keyword(s):  
Dynamic Stereochemistry

scholarly journals The Preparation and Dynamic Stereochemistry of Oxyarsoranes Containing Five- and Six-membered Ring Systems.

1975 ◽  
Vol 29b ◽  
pp. 741-748 ◽  
Author(s):  
Arild J. Dale ◽  
Paul Frøyen ◽  
Mona Grönlund ◽  
Anna-Britta Hörnfeldt ◽  
Rolf Servin ◽  
...  
Keyword(s):  
Membered Ring ◽  
Ring Systems ◽  
Dynamic Stereochemistry

Solution Studies of the Dynamic Stereochemistry of Palladium(II) Carboxylate Complexes

1975 ◽  
Vol 53 (17) ◽  
pp. 2558-2574 ◽  
Author(s):  
Thomas R. Jack ◽  
John Powell
Keyword(s):  
Ring Opening ◽  
Variable Temperature ◽  
Equilibrium Constants ◽  
Quantitative Measure ◽  
Intermediate Species ◽  
Tertiary Phosphine ◽  
Crystalline Complex ◽  
Carboxylate Complexes ◽  
Solution Studies ◽  
Dynamic Stereochemistry

A series of dimeric tertiary phosphine carboxylate complexes of palladium(II) of the general types [(PR3)Pd(O2CR)2]2 and [(PR3)Pd(O2CR)(O2CR)]2 have been synthesized and struc-turally characterized. The dynamic stereochemistry of the complexes where PR3 = Me2PhP has been investigated using variable temperature n.m.r. techniques. Exchange of the stereochemically nonequivalent methyl groups of the coordinated Me2PhP ligand occurs via a solvent assisted process involving ring opening of the "Pd2(OCO)2" bridged structure. For the trifluoroacetate complexes solution equilibria between monomer and dimer are readily apparent at low temperatures in the 19F n.m.r. The observed equilibrium constants are a function of the solvent and the size of the PR3 ligand. The reaction of [(PMe2Ph)Pd(O2CCF3)2]2 with excess AgO2CCF3 gives an unusual crystalline complex of stoichiometry Ag[(PMe2Ph)Pd(O2CCF3)3]. A quantitative measure of the ability of a coordinated carboxylate to stabilize intermediate species via chelation has been obtained from a variable temperature n.m.r. study of [(Π-2-methylallyl)Pd(O2CR)(Me2PhP)] (R=CH3, CH2Cl, CHCl2, CCl3, CF3, CMe3, CPh3, CH2Ph).

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