Olefins osmium catalysis

Organometallic compounds asymmetric catalysis, 11, 255 chiral auxiliaries, 266 enantioselectivity, 255 see also specific compounds Organozinc chemistry, 260 amino alcohols, 261, 355 chirality amplification, 273 efficiency origins, 273 ligand acceleration, 260 molecular structures, 276 reaction mechanism, 269 transition state models, 264 turnover-limiting step, 271 Orthohydroxylation, naphthol, 230 Osmium, olefin dihydroxylation, 150 Oxametallacycle intermediates, 150, 152 Oxazaborolidines, 134 Oxazoline, 356 Oxidation amines, 155 olefins, 137, 150 reduction, 5 sulfides, 155 Oxidative addition, 5 amine isomerization, 111 hydrogen molecule, 16 Oxidative dimerization, chiral phenols, 287 Oximes, borane reduction, 135 Oxindole alkylation, 338 Oxiranes, enantioselective synthesis, 137, 289, 326, 333, 349, 361 Oxonium polymerization, 332 Oxo process, 162 Oxovanadium complexes, 220 Oxygenation, C—H bonds, 149... 

Diphenyl sulphide reacts with anhydrous chloramine-T to give an adduct (8), which is a useful reagent for the amination of olefins (Scheme 7). The osmium-catalysed oxyamination of olefins by chloramine-T has been improved by phase-transfer catalysis, and the stereospecific vicinal oxyamination of olefins by alkylimido-osmium compounds has been reported. ... 

Lastly, with only a handful of reports to date, NHC-Os-based catalysis can hardly be considered anything other than a curiosity. The toxicity of osmium and the inertness of third-row transition metals are most likely to blame for this situation. It should be stressed, nevertheless, that the two types of transformation explored so far, olefin metathesis and hydrogen transfer reactions, are among the most important in modern organometallic catalysis. 

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