π-Donor-substituted metallacumulenes of chromium and tungsten
作者： Helmut Fischer , Normen Szesni
DOI: 10.1016/J.CCR.2004.05.006
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摘要: Abstract The review describes the synthesis of π-donor-substituted carbonyl metallacumulenes [(CO) 5 M(CC) x C(R 1 )R 2 ] ( =1: allenylidene complexes; =2: pentatetraenylidene complexes) chromium and tungsten. π-donating properties substituents at one end carbon chain have been varied through employing different combinations R (Ph, OR, NR ) ). back-bonding metal-ligand fragment other changed by displacing ligands P-, As-, or Sb-donor ligands. influence varying these two parameters on spectroscopic properties, bonding within metallacumulene chain, reactivity is evaluated. selectivity reactions with various N- C-nucleophiles as well in ynamines are described. Examples for applying some to heterocyclic given.
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