By Russell N. Grimes

ISBN-10: 012374170X

ISBN-13: 9780123741707

Carboranes moment variation is designed as a finished resource of data in a box that has skilled huge, immense development in either its primary and utilized points within the 4 a long time because the booklet of Carboranes (1970). in this lengthy interval millions of unique learn papers have seemed, besides many evaluation articles and booklet chapters facing points of carborane chemistry. As carborane technology has grown in complexity, and purposes have complicated gradually in components similar to medication, nanostructured and electroactive fabrics, catalysis, polymers, and others, the necessity for a monograph overlaying the whole sector in a unified remedy has turn into more and more obvious. This quantity has vital ambitions, the 1st of that's to supply a readable and concise advent to the fundamental ideas underlying the synthesis, buildings, reactivity, and purposes of carboranes and metallacarboranes at a degree appropriate for readers in and academe who're no longer proficient in boron chemistry yet locate themselves operating with, or lecturing approximately carboranes. Secondly, the ebook furnishes a trove of particular info for staff energetic in carborane technological know-how and linked applied sciences. for that reason, it comprises tables directory millions of particular compounds keyed to literature references (supplemented by way of additional info to be had on a website), including greater than 2,000 molecular constitution drawings that remove darkness from the accompanying dialogue. Thorough therapy of the synthesis, constructions, and reactions of carboranes, heterocarboranes, and metallacarboranes within the first thirteen chapters is by way of 4 chapters detailing advances in functional functions in polymer technology, catalysis, drugs, and different components. over 2,000 molecular constitution drawings light up the textual content all through tables directory millions of compounds with key literature references supplemental details at the book's site

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The dimer 2,20 -(1,5-C2B3H4)2 has also been produced, in quantitative yield, by PtBr2-catalyzed dehydrogenation and 2B intercage bonds in the B2 2B linkage at 25  C [113]. MNDO calculations indicate a large rotational barrier for the B2 dimer and trimer, suggesting p-interaction between the polyhedra. In the dimer, the most stable conformation has D2d symmetry with the B3 planes in the two cages mutually perpendicular [111]. 6 hybridization) for the B2 p-p p-bonding is a distinct possibility. Exposure of neat 1,5-C2B3H5 to Cl2 and NO2 leads to uncharacterizable products [109]; however, reaction with Cl2 in solution gives the 2-chloro derivative, and treatment with BMe3 in the gas phase affords a mixture of B-mono- di-, and trimethylcarboranes [67].

Schleyer and coworkers concluded, on the basis of ab initio calculations of energies and magnetic properties [86], that there is, in fact, a significant B2 2B bonding interaction and hence the nonclassical description is valid for 1,5-C2B3H5 and other 1,5-X2B3H3 clusters in which X is N, P, SiH, or BHÀ. 2B2 2C [87,88] or B2 2C2 2B [89] bondOther studies of the 1,5-C2B3H5 system favor delocalized three-center C2 ing. The full story, however, is more complex. g, NH2) are essentially classical, with minimal B2 2B interaction, in contrast to derivatives in which X ¼ H or alkyl, which feature electron-delocalized cluster bonding and are nonclassical [91].

In all but a few cases, this definition clearly separates the carboranes from conventional organoboranes whose hydrocarbon-like structures can be described entirely in terms of 2c2e bonds. As will be seen, some 4- and 5-vertex cages straddle the borderline between classical and nonclassical systems, but otherwise there is no difficulty in distinguishing carboranes from other compound types. 1 CB3Hx and C2B2Hx Two nonclassical CB3 derivatives, 4-1 and 4-2, have been isolated and characterized, and several such systems have been explored theoretically (Table 4-1) [7–10].

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