Synthesis and reactions of [(((η6)-2-acylaryl)-C,O)tetracarbonylmanganese]-tricarbonylchromium complexes: enhancement of diastereoselection during cyclopentaannulation
作者:George R Clark、Michael R Metzler、Giles Whitaker、Paul D Woodgate
DOI:10.1016/0022-328x(95)05964-q
日期:1996.5
Cyclomanganation reactions of [(eta(6))-acylaryl]tricarbonylchromium complexes have been investigated, Three novel heterobimetallic complexes have been synthesised in moderate to good yield, with one being characterised by X-ray crystallography. Several modes of activating these bimetallic complexes towards coupling reactions with substituted alkenes and alkynes were investigated, including oxidative decarbonylation at room temperature, and thermal promotion. The stereochemistry of one of the cyclopentaannulated adducts has been established by X-ray crystallography. Thermal displacement of one of the CO ligands of the bimetallic complex 27 in the presence of PPh(3) afforded a single adduct, the structure of which was established by X-ray crystallography. The chemistry of this novel bimetallic system was investigated.
Correlation of 31P chemical shifts and carbonyl stretching force constants with substituent constants for a series of ring-substituted arene chromium dicarbonyl triphenylphosphine complexes
作者:Thomas E. Bitterwolf
DOI:10.1016/s0277-5387(00)80388-5
日期:1988.1
prepared and characterized by IR and NMR spectroscopy. Carbonylstretchingforceconstants for all compounds have been calculated. Correlations of stretching forces constants of arene chromium tricarbonyl complexes with a series of substituent constants agree well with those reported in earlier studies. Similarly, both the stretchingforceconstants and 31P chemical shifts of arene chromium dicarbonyl