EFFECTS OF MULTIPLE SUBSTITUENTS ON THE PHYSICAL PROPERTIES OF PENTACARBONYLARYLISOCYANIDECHROMIUM COMPOUNDS
作者： Randy F. Johnston
DOI: 10.1080/00958979408022545
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摘要: Abstract Eight arylisocyanides containing one or more electron-withdrawing substituents were synthesized. The σ-donating and π-accepting abilities of these isocyanides evaluated by examining the spectroscopic electrochemical properties pentacarbonyl(isocyanide)chromium derivatives. Linear relationships between Hammett parameters para-substituted isocyanides, 13C NMR chemical shifts, ν(CN) with E 1/2 found. Ortho substitutions isocyanide stabilized HOMO Cr(CO)5L than para substitutions. Furthermore, each successively added substituent caused a similar shift in observed oxidation potential relative to its position on isocyanide.
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