Nuclear magnetic resonance investigations of configurational non-rigidity in dinuclear platinum(IV) complexes. Part 5. Intra-molecular rearrangements in the dinuclear platinum(IV) complexes of 1,3,5,7=tetrathiocane. X-Ray Crystal Structure of [(PtClMe3)2-(SCH2SCH2SCH2SCH2)]

Author(s):  
Edward W. Abel ◽  
Gary D. King ◽  
Keith G. Orrell ◽  
Vladimir Sik ◽  
T. Stanley Cameron ◽  
...  

1980 ◽  
Vol 58 (17) ◽  
pp. 1821-1828 ◽  
Author(s):  
Gary D. Fallon ◽  
Bryan M. Gatehouse ◽  
Allan Pring ◽  
Ian D. Rae ◽  
Josephine A. Weigold

Ethyl-3-amino-2-benzoyl-2-butenoate crystallizes from pentane as either the E (mp 82–84 °C) or the Z-isomer (mp 95.5–96.5 °C). The E isomer is less stable, and changes spontaneously into the Z, which bas been identified by X-ray crystallography. The structure is characterised by an N–H/ester CO hydrogen bond and a very long C2—C3 bond (1.39 Å). Nuclear magnetic resonance methods have been used to measure the rate of [Formula: see text] isomerization at several temperatures, leading to the estimate that the free energy of activation at 268 K is 56 ± 8 kJ.





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