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New PDF release: Carboranes

By Russell N. Grimes

ISBN-10: 0128018941

ISBN-13: 9780128018941

ISBN-10: 0128019050

ISBN-13: 9780128019054

Carboranes, 3rd Edition, by way of Russell Grimes, is the definitive source at the topic. thoroughly up-to-date with a wealth of study and evaluate articles released during this energetic box because the earlier quantity used to be published in 2011, the booklet presents a readable and concise creation to the fundamental rules underlying the synthesis, buildings, and reactions of carboranes, heterocarboranes, and metallacarboranes. Following the dear foundational info, the ebook explores the advances in sensible purposes for the numerous parts during which specialists have came across that carboranes have enough money new probabilities for fixing difficulties and advancing the technological know-how. those disciplines contain polymer technological know-how, catalysis, biomedicine, nanomaterials, and others.

  • Includes over 2,000 molecular constitution drawings during the text
  • Features accelerated assurance on purposes of carboranes, rather in biomedicine and nanomaterials, given the expansion of study in those areas
  • Presents prolonged and up to date tables, directory hundreds of thousands of compounds with key literature references, supplied on-line through the book’s website
  • Explores the advances in useful purposes for the various components within which specialists have came upon that carboranes find the money for new percentages for fixing difficulties and advancing the science

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Additional resources for Carboranes

Sample text

1 Synthesis The first nido-tricarbahexaborane, indeed the first three-carbon carborane of any type, to be isolated and characterized was 2,3,4-MeC3B3H6, obtained in 1966 as one of several carboranes formed in the gas-phase reaction of B4H10 with acetylene at 25-70 °C (whose major product when the reaction is quenched is the previously described nido-1,2-C2B3H7) [51,127,231]. Two other products of this reaction, originally thought to be 2,3,4-Me2C3B3H5 isomers, were later identified as the nido-2,3-dicarbahexaboranes 2,3-MeC2B4H6À4-Me and 2,3-C2B4H7À5-Et [29].

Alternatively, 1-propynyldiethylborane (Et2BC^CMe) or bis(diethylboryl)alkenes [R(Et2B)C]CEt(BEt2)] can be treated with excess tetraethyldiborane(6) to generate the hexaalkyl compounds nido-2,3,5-Et2RC3B3Et3 (R ¼ Me or Et), accompanied by the 2,3,4-C3B3 derivatives 4-33 and 4-34 discussed above [233,240,414]. Both the 2,3,4 and 2,3,5 isomers are proposed to form via EtBH2 loss from an unisolated C2-bridged arachno-carborane common intermediate, 4-39 [233]. This process appears similar to the conversion of arachno-1-EtCB4Et4H3-m(2,3)-CEt(BEt2) (4-12) to nido2,4-Et2C2B4Et4H2 (4-29) (Figure 4-8), the difference being that 4-12, with only one bridging carbon, gives rise to dicarbon carborane products, while 4-39, with a dicarbon bridge, generates tricarbaboranes.

8 A [74], together with a number of theoretical studies [75–85], appear to favor the classical organoborane model with an implied absence of BdB bonding. However, this conclusion is difficult to reconcile with the relative thermal and chemical stabilities of 1,5-C2B3H5 (for example, its ability to survive temperatures up to 150 °C and its unreactivity toward water or air at room temperature), which are behaviors far more typical of closo-carboranes than classical organoboranes. Schleyer and coworkers concluded, on the basis of ab initio calculations of energies and magnetic properties [86], that there is, in fact, a significant BdB bonding interaction and hence the nonclassical description is valid for 1,5-C2B3H5 and other 1,5X2B3H3 clusters in which X is N, P, SiH, or BHÀ.

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Carboranes by Russell N. Grimes

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