Photoinitiation of Acrylate Polymerization with (Arene)chromium Complexes
作者:E. Peter Kündig、Long‐He Xu、Mikhail Kondratenko、Allan F. Cunningham、Martin Kunz
DOI:10.1002/ejic.200700115
日期:2007.6
Photoinitiation of acrylate polymerization by [Cr(eta6-arene)(CO)3] complexes in the presence of an organic chloro compound was investigated. For the bimolecular system, a good correlation between activity and metal-arene and metal-carbonyl bond strength was observed. The highest efficiency was found for an initiator in which the organic chloro compound was tethered to the complexed arene: [Cr(eta
Tricarbonylchromiumcomplexes of 4-aryl-1,4-dihydropyridines have been synthesized both under standard thermodynamic conditions using Cr(CO)6 and under milder complexation conditions using more labile [Cr(CO)3(NH3)3] and (η6-naphthalene)Cr(CO)3. Selective complexation of the Cr(CO)3 on the aryl ring in the presence of a 1,4-dihydropyridine ring was achieved.Graphical Abstract
Charge-induced facial-selectivity in the formation of new cationic planar chiral iridacycles derived from aniline
作者:Jean-Pierre Djukic、Wissam Iali、Michel Pfeffer、Xavier-Frédéric Le Goff
DOI:10.1039/c0cc05711h
日期:——
The reaction of chiral chlorido-iridacyclic 2-(4-N,N-dimethylaminophenyl)pyridines with solvato-type [Cp*M(S)3]q+ (M = Ru, S = MeCN, q = 1; M = Ir, S = MeC(O)Me, q = 2) complexes produces new cationic racemic planar chiral iridacycles in an efficient and diastereospecific way.
Indanetricarbonylchromium: the effects of 1-syn- and 1-anti substituents on the regioselectivity of nucleophilic addition. Crystal structures of 1-syn- and 1-anti- methoxyindanetricarbonylchromium
indanes have been prepared by thermolysis of Cr(CO)6 or by arene exchange with naphthalene-Cr(CO)3 (3). The regioselectivity of nucleophilic addition of α-nitrile carbon nucleophiles to syn and anti 1-R-indane Cr(CO)3 complexes (R = OMe 4, Me 10) has been investigated and compared with that of analogous reactions with indaneCr(CO)3 (1). The results of an X-ray study of syn- and anti-4 are presented. Nucleophilic
selectively substituted naphthalenetricarbonylchromium complexes are heated the tricarbonylchromium groups are redistributed between the substituted and the unsubstituted rings because of inter-ring haptotropic rearrangements. The rate constants of these isomerizations were measured. During rearrangement of individual isomers of (1-methylacenaphthene)tricarbonylchromium the configuration of the methyl group