Studies on Intramolecular Coupling of Tricarbonyl(diene)iron Systems with Pendant Olefinic Groups: Configurational Requirements for Reactions of Acyclic Diene Complexes and Mechanistic Implications
作者:Anthony J. Pearson、Asaf Alimardanov
DOI:10.1021/om980323s
日期:1998.8.1
A photothermal cyclization reaction, which involves intramolecular coupling between a diene−Fe(CO)3complex and a pendant olefinic group, has been studied for a number of acyclic diene complexes in which the olefinic group is attached as an ester, amide, keto, or alcohol derivative. While the cyclization will occur for complexes in which a methyl group is in the E stereochemical arrangement about the
(Sorbic acid) Fe(CO)2L complexes with L = CO, P(OPh)3, PPh3, and PEt3. Photolytic preparation, spectral properties, and bonding
作者:Élvio H. Santos、Edison Stein、Eduardo J.S. Vichi、Elisa B. Saitovitch
DOI:10.1016/0022-328x(89)85114-9
日期:1989.10
The (sorbic acid)Fe(CO)2L complexes, with L = CO, P(OPh)3, PPh3 and PEt3, have been prepared by irradiating the corresponding Fe(CO)4L compounds in benzene in the presence of sorbic acid. The Mössbauer spectra are compatible with the structure of a tetragonal pyramid with the iron(0) atom located in the center of the base. The values of the isomer shift, δ, seem to indicate that dπ-Lπ★ back bonding
Crownethers with a planar chiral (1,3-η4-diene)tricarbonyliron unit were prepared. They revealed a good chiralrecognition ability for α-substituted benzylammonium salts (Krel = 1.3–2.0). Ligand substitution of the iron tricarbonyl moiety with triphenylphosphane inverted the chiral selectivity.
Transformation of the carboxyl group adjacent to the (η4-diene)Fe(CO)3 moiety: a convenient route to (η4-diene)Fe(CO)3 complexes containing α,β- and β,γ-unsaturated carbonyl groups, and 1,3-dicarbonyl groups
Acyl halides adjacent to an (eta(4)-diene)Fe(CO), moiety react with allylsilanes, vinylsilanes and enamines to give the corresponding allyl ketones, vinyl ketones and 1,3-diketones in high yields, respectively. The allylation reaction proceeds smoothly under neutral conditions without a Lewis acid as an activating agent, while the vinylation reaction takes place in the presence of a Lewis acid. (C) 1999 Elsevier Science S.A. All rights reserved.
DE, MONTARBY LUCY;TOURBAH, HIAM;GREE, RENE, BULL. SOC. CHIM. FR., 3,(1989) C. 419-432