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Michael Adducts of (Alkynylcarbene)pentacarbonylchromium Complexes: Formation, Stereochemistry, and Thermal Rearrangement
Author(s) -
Duetsch Michael,
Stein Frank,
Meijere Armin De,
Lackmann Rolf,
Pohl Ehmke,
HerbstIrmer Regine
Publication year - 1992
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19921250913
Subject(s) - chemistry , carbene , adduct , tetrahydrofuran , chromium , ligand (biochemistry) , stereochemistry , crystal structure , medicinal chemistry , crystallography , catalysis , organic chemistry , receptor , biochemistry , solvent
β‐Donor‐substituted α,β‐unsaturated chromium carbene complexes (CO) 5 CrC(OEt)C = CR(XR′ n ) ( X = N, O, S; 3, 9, 11–16, 22–25 ) have been synthesized by Michael addition of amines, alcohols, and thiols to alkynylcarbene complexes (CO) 5 CrC‐(OEt)CCR ( 1 ). The configurations of the newly formed C–C double bonds have been determined by NOE/NOESY measurements and X‐ray crystal structure analysis. These vinylcarbene complexes lose one carbonyl ligand in refluxing tetrahydrofuran to give tetracarbonyl complexes (CO)4CrC(OEt)C = CR(XR′ n ) (X = N, O, S; 26–28 ).