Dicarba-closo-dodecaboranes with One and Two Ethynyl Groups Bonded to Boron

✍ Scribed by Alexander Himmelspach; Maik Finze

• Book ID: 102830329
• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 678 KB
• Volume: 2010
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.201000064

✦ Synopsis

The diethynyldicarba-closo-dodecaboranes 1,2-R 2 -9,12-(HCC) 2 -closo-1,2-C 2 B 10 H 8 [R = H (1a), Me (2a)] and 9,10-(HCC) 2 -closo-1,7-C 2 B 10 H 10 (3a) were obtained by Pd-catalyzed Kumada-type cross-coupling reactions of the corresponding diiodinated dicarba-closo-dodecaboranes with Me 3 SiCCMgBr followed by desilylation of the trimethylsilylalkynyl-substituted clusters. In addition, the related {closo-C 2 B 10 } derivatives with one ethynyl group 1,2-R-9-HCC-closo-1,2-C 2 B 10 H 9 [R = H (4a), Me (5a)], 9-HCC-closo-1,7-C 2 B 10 H 11 (6a), and 2-HCC-closo-1,12-C 2 B 10 H 11 (7a) were synthesized and their spectroscopic properties were compared to those of the diethynyl-substituted {closo-C 2 B 10 } clusters. The ethynyl-and trimethylsilylalkynyl-function-