Hypho

B H +g. No neutral borane has yet been definitely established in this series but the known compounds BgHie and BioHig may prove to be hypho-hormcs and several adducts are known to have hypho-stmctures (pp. 171-2). 

Boranes are usually named by indicating the number of B atoms with a latin prefix and the number of H atoms by an arabic number in parentheses, e.g. B5H9, pentaborane(9) B5H11, pentaboranefl 1). Names for anions end in ate rather than ane and specify both the number of H and B atoms and the charge, e.g. BsHs" octahydropentaboratefl—). Further information can be provided by the optional inclusion of the italicized descriptors closo-, nido-, arachno-, hypho- and conjuncto-, e.g. ... 

J. C. Tarafdar and H. Marschner, Phosphatase activity in the rhizosphere and hypho-sphere of VA mycorrhizal wheat supplied with inorganic and organic phosphorus. Soil Biol. Biocheni. 26 387 (1994). 

Figure 8 All known hypho-carboranes have a common C2Be cage framework.

A terminal methyl group was generated in the reaction of the dicarbaborane [arachnoA -C- -jW with butyl nitrite to give [exo-ft-GHi-hypho-lwith a yield of 5%. The endo isomer of this azacarbaborane is also known and was produced from [8,9-lu-NH2- raA -5,6-C2B8H11] after removal of two boron vertices.84... 

The chemistry and formation of a variety of substitution patterns of the cluster (NHR)B8FIn(NH2R) was studied extensively in the last 10 years.83,91-94 Furthermore, the electron count was discussed hypho-nine-vertex cluster, zzrar 0-eight-vertex versus -eight-vertex cluster.95,96 The formation mechanism of this azaborane and espe-... 

Derivatives of the trishomotriborirane dianion P are formed when alkali metals react in donor solvents with 1,3,5-triboracyclohexane derivatives. The dianion [(CHMe)3(MeB)3]2 has 20 SE and according to the cluster rules classifies as 2,4,6-tricarba-hypho-hexaborane-diid. However, the compounds exist as contact ion pairs, and are therefore regarded as heterocarboranes (see Section 3.2.8). 

Insertion of a third methylene bridge into M leads to hypho P with 20 SE. The tetrameric species [Li(thp)2Li87]4 and Li([12]cr-4)2 4(Li87)4 suggest that one Li+ has to be assigned to each [(MeCH)3BMe]32 arachno cluster. The former is coordinated by two C-B bonds of the neighboring cluster [103]. This increases the total... 

A large number of borane clusters of the hypho-type are known that contain bridging groups such as CH2, NH, S, etc. Formally, these groups could be considered to... 

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