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The reaction of 1,1-bis(trim ethylstannyl)-2-m ethylpropene-1 and 1,3-bis(dichloroboryl)- propane leads to the chloro derivate of 6,6-dimethyl-2-m ethylidene-1,3-diboracyclohexane (1a), in which the Cl atoms are substituted by the dimethylamino and the methyl group to yield lb and 1c . Similarly the benzo-1,4-diboracycloheptene-2 derivative 2a is obtained from 1,2-C 6 H 4 (SnMe 3 ) 2  and (Cl 2 B) 2 C 3 H 6 . Replacement of the substituent leads to the dimethylamino (2b) and methyl derivatives (2c). Redox reaction between hexyne-3 and (I 2 B) 2 C 3 H 6  results in the formation of 1,4-diiodo-2,3-diethyl-1,4-diboracycloheptene-2 (3a), which is methylated to give 3c. The constitutions of 1a-c, 2a-c and 3a,c are derived from NMR and MS data and are confirmed by X-ray structure analyses for 1b and 2b.

zeitschrift für naturforschung b

Neue Borkohlenstoffheterocyclen: Benzo-1,4-diboracyclohepten-2, 1,4-Diboracyclohepten-2 und das isomere 6.6-Dimethy 1-2-methyliden-1,3-diboracyclohexan / New Organoboran Heterocycles: Benzo-1,4-diboracycloheptene-2, 1,4-Diboracyclopentene-2 and the Isomeric 6,6-Dimethyl-2-methylidene-1,3-diboracyclohexane