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Redox reactions of cyclooctyne and 1,1-bis(diiodboryl)ethane lead to 4,5-cycloocta-2,3-dihydro-1,3-diiodo-2-methyl-1,3-diborole (1a), which is methylated with AlMe 3  to give 4,5-cycloocta-2,3-dihydro-1,2,3-trimethyl-1,3-diborole (1b). Complexation of 1b with the complex fragments (C 5 H 5 )Co, (C 8 H 12 )Ni, (C 5 H 5 )Ni, and (OC) 3 Co leads to the corresponding metal complexes 2b, 3b, 4b, and 5b. Their constitutions are derived from spectroscopic data and confirmed for 2b and 4b by X-ray structure analyses. 2b contains a C-H-B 3c/2e bond, its hydrogen atom could be located. [(C 8 H 12 )Ni(1b)] (3b) is the first example for a (C 8 H 12 )Ni complex having a C-H-B interaction.

zeitschrift für naturforschung b

Synthese und Komplexierung des 4.5-Cycloocta-2,3-dihydro-1,2,3-trimethyl-1,3-diborols / Synthesis and Complexation of 4,5-Cycloocta-2,3-dihydro-1,2,3-trimethyl-1,3-diborole