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The reaction of the di(alkyn-1-yl)silanes Me 2 Si(C≡CSiMe 2 H) 2  1a and Me(H)Si(C≡CSiMe 2 H) 2  1b with triethylborane was studied. In the case of 1a, the 4-ethyl-3-diethylboryl-1,1-dimethyl-2,5- bis(dimethylsilyl)-1-sila-2,4-cyclop entadiene 2a was the sole product. In the case of 1b, the analogous silole 2b was formed along with two other products which were identified as di(alkenyl)silanes 3b and 4b, in which different types of electron-deficient Si-H-B bridges could be detected. All products were characterised by consistent sets of solution NMR data ( 1 H,  11 B,  13 C and  29 Si NMR). The coupling constants  1 J( 13 C, 13 C) were measured for 2a and calculated by using DFT methods (B3LYP/6-311+G(d,p) level of theory)

1,1-Ethylboration Of Di(alkyn-1-yl)Silanes With Two And Three Si-H Functions. New Silacyclopentadienes