Boranes organometallic compound

The synthesis of compounds containing boron-group IIB bonds also occurs by two pathways. The most convenient method is using anionic borane or carboranc species, as in the group-IB case, to react with Zn, Cd, or Hg halides. Moreover, reactions between organometallic compounds (Zn, Cd) with unchanged boranes arc also realized, so Zn and Cd decaboranes, e.g., MB H 2 n solvent (M = Zn, Cd), result from reactions of decaborane(14) with MRj . 

Reaction of halo ketones or diazo ketones with boranes 0-102 Carbonylation of alkyl halides 0-104 Reaction between acyl halides and organometallic compounds 0-105 Reaction between other acid derivatives and organometallic compounds... 

Addition of organometallic compounds to unsaturated ketones 5-19 Addition of boranes to unsaturated... 

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... 

Occasionally hydroxylation of the carbon nucleophile is observed during Pd-cata-lyzed C-C bond formation (Scheme8.15 third reaction in Scheme8.14 [121]). These reactions may in some instances proceed by a mechanism analogous to the Wacker reaction [130], or to the hydroxylation of organometallic compounds or boranes by peroxides or air (Section 3.5). 

The most important organometallic compound that transfers an H atom along with the electron pair from the /i-position to the carbonyl carbon is Alpine-Borane (see Figure 10.24). 

Aryl Migrations in Organometallic Compounds of the Alkali Metals, 16, 167 Boranes in Organic Chemistry, 11, 1... 

A45. R. M. Adams, ed., Boron, Metallo-boron Compounds and Boranes. Wiley (Interscience), New York, 1964. 765 pp. Mainly inorganic boron chemistry, but organometallic compounds are described briefly in Chapters 6 and 7. Chapter 8 contains a section (7 pp.) on the toxicity of organoboron compounds. 

A48. R. L. Hughes, I. C. Smith, and E. W. Lawless, Production of the Boranes and Related Research. Academic Press, New York, 1967. Organometallic compounds are discussed in Chapters 8 (alkylboranes), 9 (carboranes), and 11 (B-N chemistry). 

Tetracoordinated borate complexes are usually formed as intermediates, which are not always isolated. Convenient methods for the synthesis of aryl borates consist of the reaction of boron halides with an appropriate organometallic compound or the complexation of boranes with a nucleophile (76JOM281 78JCS(P2)1225 79MI2). Application of the former... 

Reviews (a) Nesmeyanov, A. N. Sokolik, R. A. Methods of Elemento-Organic Chemistry, North-Holland, Amsterdam, 1967, Vol. 1. (b) Pelter, A., Smith, K. and Brown, H. C. Borane Reagents, Academic Press, London, 1988. (c) Miyaura, N. and Maruoka, K. In Synthesis of Organometallic Compounds, John Wiley Sons, Chichester, 1997, 345. 

Refer to something that has just happened on the program, perhaps something the previous speaker said My colleague has discussed photochemical studies of organometallic compounds. I will now discuss the photochemistry of main-group clusters, particularly the boranes. ... 

To gain five electrons, boron builds unique closo or cage-like molecules. One class of neutral B-H ionic species called boranes serves as a good example of what could be possible with other organometallic compounds that form cagelike molecules. 

Reactions of allenes with halides are terminated by attack of organometallic compounds. The reaction of the 2-(2,3-butadienyl)iodobenzene (457) was terminated with alkenyl borane to give 458 [173]. 3-Methyl-1,2-butadiene (459) reacts with ary iodide, and the reaction is terminated by the attack of arylboronic acid 460 to afford 461 [174]. 

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