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On heating bis(diiodoboryl)methane (1c) and 1,1-bis(diiodoboryl)alkanes 1i, l (alkane = propane, butane) under reduced pressure elimination of BI 3  takes place and the corresponding 1,3,5-triiodo- 1,3,5-triboracyclohexane derivatives 2c; 2i, i’; 2l, l’ are formed. Starting with bis(dichloroboryl)- and bis(dibromoboryl)methane (1a, 1b) only small amounts of the trimerization products (H 2 C-BCl) 3  (2a) and (H 2 C-BBr) 3  (2b) are detectable which can not be separated from 1a,b and by-products. Reaction of 1,3,5-trichloro-2,4,6-trimethyl-1,3,5-triboracyclohexane (2d) with BBr 3  provides the corresponding bromo derivative 2e in high yield. An attempt to react 2,4-bis(dichloroboryl)-3-chloro- 3-borapentane (4d) with 1,1-bis(trimethylstannyl)-2,2-diphenylethene does not lead to the expected trichloro-triboracyclohexane, but the divinylchloroborane ClB(CH=CPh 2 ) 2  6a, is formed. The compositions of the products follow from analytical data and X-ray structure analyses of 2i, 2c, 2e, and 6a.

zeitschrift für naturforschung b

Synthesen und Strukturen von 1,3,5-Trihalogeno-1,3,5-triboracyclohexan-Derivaten / Syntheses and Structures of 1,3,5-Trihalogeno-1,3,5-triboracyclohexane Derivatives