The Pauson-Khand Reaction: A Gas-Phase and Solution-Phase Examination Using Electrospray Ionization Mass Spectrometry
摘要:
A series of dicobalt hexacarbonyl complexes with charged alkyne ligands were prepared to enable the study of the Pauson-Khand reaction using ESI-MS. The hexacarbonyl complexes can be activated in the gas phase through removal of a CO ligand. The resulting pentacarbonyl ions react readily with alkenes, and no discrimination between alkenes was found for this step, indicating that alkene association is not rate determining in the intermolecular reaction. Solution-phase ESI-MS studies on a system set up for intramolecular reactivity revealed only the hexacarbonyl complex as a detectable intermediate, and the reaction was shown to have a large enthalpy and entropy of activation, consistent with ligand dissociation being rate limiting in the reaction.
The Pauson-Khand Reaction: A Gas-Phase and Solution-Phase Examination Using Electrospray Ionization Mass Spectrometry
摘要:
A series of dicobalt hexacarbonyl complexes with charged alkyne ligands were prepared to enable the study of the Pauson-Khand reaction using ESI-MS. The hexacarbonyl complexes can be activated in the gas phase through removal of a CO ligand. The resulting pentacarbonyl ions react readily with alkenes, and no discrimination between alkenes was found for this step, indicating that alkene association is not rate determining in the intermolecular reaction. Solution-phase ESI-MS studies on a system set up for intramolecular reactivity revealed only the hexacarbonyl complex as a detectable intermediate, and the reaction was shown to have a large enthalpy and entropy of activation, consistent with ligand dissociation being rate limiting in the reaction.
The Stevens rearrangement of propargyl-containing ammonium salts
作者:A. Kh. Gyulnazaryan、T. A. Sahakyan、G. T. Sargsyan、J. V. Grigoryan、G. M. Muradyan、G. A. Panosyan、R. A. Tamazyan、A. G. Ayvazyan、A. M. Petrosyan
DOI:10.1134/s1070363216050054
日期:2016.5
The Stevens rearrangement of ammonium salts with two propargyl group at the ammonium nitrogen results in the formation of amines containing acetylene-acetylene and acetylene-allene fragments.
Formation of pyrrolinium derivatives in the bromination reaction of N,N-dipropargyl ammonium salts
作者:A. Kh. Gyulnazaryan、T. A. Sahakyan、R. A. Tamazyan、A. G. Ayvazyan、G. A. Panosyan、A. B. Yeremyan
DOI:10.1134/s1070363217100061
日期:2017.10
Bromination of ammonium salts containing two propargyl groups afforded bromine-substituted derivatives of pyrrolinium salts. The reactions of piperidinium and morpholinium analogs resulted in spirocyclic ammonium salts.