Carboranes peralkylated

Reduction of the pentaalkyl-1,5-dicarba-closo-pentaboranes(5) 44 with elemental K opens the cluster and subsequent reaction with I2 enforces oxidative fusion of two C2B3 units to give a C4B6 cage (Scheme 3.2-36). The peralkylated hexaboraadamantane derivatives 70 (R = Me, Et X-ray structure analysis for R = Me [89]) rearrange irreversibly into the carboranes 71 with a wido-C4B6 framework [89] (X-ray structural analysis for R = Et [90]). The structure of the nido-C Bf, cluster is fluxional in solution [91]. 

Decaethyl-2,6,8,10-tetracarba- Wo-decaborane(10) C (Fig. 2), a valence isomer of the as yet unknown decaethyl derivative in the series of the 2,4,6,8.9, lO-hexaboraadamantanes, was the first C B -carborane synthesized. " Compound C is a representative of the peralkylated carbon-rich carboranes with 24 skeletal electrons (n = 10). The skeletal... 

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