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13 C‐ and 1 H‐NMR. Studies on the Configuration of Tricarbonyliron Complexes of Oxa‐ and Aza[4.4.3]propellanes
Author(s) -
Bachmann Kurt,
Von Philipsborn Wolfgang,
Amith Chaim,
Ginsburg David
Publication year - 1977
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19770600211
Subject(s) - chemistry , propellane , carbon atom , stereochemistry , ligand (biochemistry) , nuclear magnetic resonance spectroscopy , praseodymium , coupling constant , crystallography , bicyclic molecule , ring (chemistry) , organic chemistry , biochemistry , physics , receptor , particle physics
The configurations of a series of mono ‐ and bis ‐Fe(CO) 3 complexes of 12‐oxa[4.4.3]‐propella‐2,4,7,9‐tetraene ( 1 ) and of 11,13‐dioxo‐12‐methyl‐12‐aza[4.4.3]propella‐2,4,7,9‐tetraene ( 7 ) as well as of a trienic aza‐propellane complex have been studied in solution by 13 C‐ and 1 H‐NMR. spectroscopy. Praseodymium‐induced 13 C‐shifts of the metalcarbonyl carbon atoms and of the central carbon atom of the complexed diene systems are particularly sensitive and useful to prove exo ‐ or endo ‐configuration of the tricarbonyliron ligand. In addition, H,H‐ and C,H‐coupling constants of the complexes and parent compounds are reported and discussed.