Carboranes tetracarbon

Many novel cluster compounds have now been prepared in this way, including mixed metal clusters. Further routes involve the oxidative fusion of dicarbon metallacarborane anions to give dimetal tetracarbon clusters such as (103) and (104) O (jjg insertion of isonitriles into inetallaborane clusters to give monocarbon meiallacarboranes such as (105) and the reaction of small ii/t/o-carboranes with alane adducts such as Et3NAlH3 to give the commo species (106) ... 

Figure S-15 Transition metal-promoted syntheses of tetracarbon carboranes.

An example illustrating the possibility of significantly different reactivity is pertinent here (see also Section 5). A comparison of the photon driven reaction of aUcynes with (CO)3Fe()]" -E4H4), E = C, BH (39) has been reported. The former yields substituted benzenes, whereas the latter generates predominantly carbon-rich carboranes, C H B4H4, n = 2, 4, 9, where the tetracarbon carborane is the primary product. 

This article describes two syntheses the bis(carbaborane)iron(III) complex and the conversion of this compound to the neutral tetracarbon carborane. Both procedures generate high yields of product and entail normal vacuum-line synthetic techniques. The starting material, 2,3-diethyl-2,3-dicarba-m cfo-hexa-borane(8) can be obtained by the procedure described in the preceding article. 

SiMe3)-3-(R)-2,3-C2B4HJ - (R = SiMe3, n-Bu or r-Bu) were oxidized by NiCl a completely different set of tetracarbon carboranes were produced. ... 

Scheme 2 Syntheses of Tetracarbon-carborane Compounds of Group 1 and Group 2 Metals...

Cl, Hi BFjNO, B,B-Bis-(p-f luorophenyDboroxazolidine, 4QB, 591 Ci HigBNO, B,B-Diphenylboroxazolidine (monoclinic), 39B, 476 Ci4HigBNO, B,B-Diphenylboroxazolidine (orthorhombic), 42B, 516 Cl4H20B6CO2, Tetracarbon-cobaltacarborane, 44B, 581 C14H20B10, 1,7-Diphenyl-m-carborane, 43B, 813... 

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