F Pentaborane

Pentaammineazidoruthenium(III) chloride, 4067 Pentaamminechlorocobalt(ni) perchlorate, 4117 Pentaamminechloromthenium chloride, 4131 Pentaamminedinitrogenosmium(II) perchlorate, 4066 Pentaamminedinitrogenruthenium(II) salts, 4591a Pentaamminenitratocobalt(III) nitrate, 4201 Pentaamminenitrochromium(III) nitrate, 4227a Pentaamminephosphinatochromium(III) perchlorate, 4047 Pentaamminephosphinatocobalt(III) perchlorate, 4044 Pentaamminepyrazineruthenium(II) perchlorate, 1786 Pentaamminepyridineruthenium(II) perchlorate, 2042 Pentaamminethiocyanatocobalt(III) perchlorate, 0516 Pentaamminethiocyanatoruthenium(III) perchlorate, 0517 f Pentaborane(9), 0188... 

Nickel(II) cyanide, 0993 Nitrogen oxide, 4719 Nitrogen trichloride, 4137 Nitrogen triodide, 4628 Nitrosyl chloride, 4017 Nitryl chloride, 4019 Nitryl hypofluorite, 4298 Oxygen difluoride, 4311 f Pentaborane(9), 0188 f 1,4-Pentadiene, 1891 f 1,3-Pentadiene, 1890 f 1,2-Pentadiene, 1889 f 2-Pentyne, 1893 f 1-Pentyne, 1892... 

When a boron atom of a borane is replaced by a heteroelement, the compounds are called carbaboranes, phosphaboranes, thiaboranes, azaboranes, etc, by an adaptation of oiganic replacement nomenclature. The numbering of the skeleton in heteroboranes is such that the heteroelement is given the lowest possible number consistent with the conventions of the parent borane. Thus C2B3H5 is dicarba-f/ojo-pentaborane(5) and could occur as the 1,2-, 2,3-, or 1,5-isomeric forms (1,2-dicarba- 7[Pg.228]

Pentaborane(ll), 0189 Pentacarbonylmanganese hydride, 1808b Pentachloroethane, 0656 Pentacyclo[4.2.0.02,5.03 8.04 7]octane, 2936b f 1,2-Pentadiene, 1889... 

If we remove two vertex boron atoms, the resulting framework is an urachno (Gr., "spider s web ) structure. With two vertices missing, the structure is even more open I ban is the nido case and the resemblance to the parent doso structure is less apparent. Arachno structures obey the electronic formula 2n -f- 6 (or n -t- 3 electron pairs). Pentaboraned I), B5B,, must therefore have an arachno structure. In the arachno series the extra hydrogen atoms form endo B—H bonds (lying close to the framework) as well as bridges. 

Wolfe F, Anderson J Silicone filled breast implants and the risk of fibromyalgia and rheumatoid arthritis. J Rheumatol 26 2025-2028,1999 Yarbrough BE, Garrettson LK, Zolet DI, et al Severe central nervous system damage and profound acidosis in persons exposed to pentaborane. Clin Toxicol 23 519-536, 1985... 

Diborane is not unique among the boron hydrides in its ability to form a carbonyl. High pressure reaction of either pentaborane-f / or tetra-borane-10 with carbon monoxide forms a substance which behaves like borane-carbonyl in its manner of decomposition. The formula of this polyborane-carbonyl has recently been established as OC B Hg (mp, — 114.5° bp, 59.6°) 41a). It reacts with trimethylamine without release of carbon monoxide. 

Pentaborane is a nonmetallic, colorless liquid with a pungent odor. It decomposes at 300°F, if it has not already ignited, and will ignite spontaneously in air if... 

Pentaborane-9 (B5H9) (see Example 7.11) is called a high-energy compound because of the large amount of energy it releases upon combustion. In general, compounds that have positive AH°f values tend to release more heat as a result of combustion and to be less stable than those with negative A f° values. 

Boric acid, boron salts, protein, diborane and pentaborane do not interfere. 1. D. L. Hill, E. I. Gibson and J. F. Heacock, Anal Chem., 28 (1956) 133. 

D. F. Gaines and J. L. Walsh, Inorg. Chem., 1978,17, 806. Kinetics of the isomerization of 1-chloro- and 2-chloro-pentaborane(9) using diethylether catalyst. 

G. A. Kline and R. F. Porter, Inorg. Chem., 1980, 19, 447. Intermediates in the mercury-photosensitized reactions of pentaborane(9). 

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