1192-31-0Relevant academic research and scientific papers
Selective alkene oxidation with H2O2 and a heterogenized Mn catalyst: Epoxidation and a new entry to vicinal cis-diols
De Vos, Dirk E.,De Wildeman, Stefaan,Sels, Bert F.,Grobet, Piet J.,Jacobs, Pierre A.
, p. 980 - 983 (2007/10/03)
Covalent anchoring of 1,4-dimethyl-1,4,7-triazacyclononane on silica gel is the first step in the preparation of a heterogenized Mn catalyst. When H2O2 is used as the oxidant, this material can catalyze the vicinal cis- dihydroxylation of disubstituted olefins, as shown schematically here. Both enantiomers of the product are obtained.
Hydrocarbon oxidation with iodosylbenzene catalysed by the sterically hindered iron(III) 5-(pentafluorophenyl)-10,15,20-tris(2,6-dichlorophenyl)porphyrin in homogeneous solution and covalently bound to silica
Assis, Marilda Das Dores,Lindsay Smith, John R.
, p. 2221 - 2226 (2007/10/03)
Iron(III) 5-(pentafluorophenyl)-10,15,20-tris(2,6-dichlorophenyl)porphyrin has been synthesised and used to catalyse hydrocarbon oxidation by iodosylbenzene. In homogeneous solution it is shown to be a stable and effective catalyst for alkene epoxidation and alkane hydroxyladon with a selectivity and reactivity closer to iron(III)tetrakis(pentafluorophenyl)porphyrin than to iron(III) tetrakis(2,6-dichlorophenyl)porphyrin. The new sterically hindered iron porphyrin has also been covalently bound, by nucleophilic aromatic substitution to aminopropylated silica. The resulting heterogenised catalyst is also stable towards oxidation but is less reactive than its homogeneous analogue.
Photoinduced Nitrene, Carbene, and Atomic Oxygen Transfer Reactions Starting from the Corresponding Pyridinium N-, C-, and O-Ylides
Strub, Henri,Strehler, Christiane,Streith, Jacques
, p. 355 - 364 (2007/10/02)
Ultraviolet irradiation of the pyridinium ylides 1, 2, and 3 led to fragmentation of the exocyclic polar bonds, as well as to skeletal rearrangements.The photoinduced fragmentation processes gave the corresponding pyridines and highly reactive intermediates, i. e. ethoxycarbonylnitrene, dicyanocarbene and atomic oxygen (oxene), respectively.Trapping of the reactive intermediates by alkanes and alkenes permitted the determination of their spin multiplicity.Ethoxycarbonylnitrene was in its triplet ground state at the moment of its formation.Dicyanocarbene occurred as a mixture of singlet and triplet, as determined by dilution experiments with variable amounts of alkenes.As to atomic oxygen, all collected data point to its formation in solution in its triplet ground state.
