212255-60-2Relevant academic research and scientific papers
1,6-Dihydro-1,6-disilapentalene derivatives by 1,1-organoboration of triynes
Wrackmeyer, Bernd,Kehr, Gerald,Suess, Juergen,Molla, Elias
, p. 207 - 215 (1998)
The triynes R1CC-SiMe2-CC-SiMe2-CCR 1 [R1=H (3), SiMe3 (4) SnMe3 (5)] were prepared, and their reactivity towards triorganoboranes R3B 6 [R=Et (a), CH2Ph (b), Ph (c), 2-thienyl (d)] was studied. In the case of 3, decomposition was observed whereas the reaction of 4 and 5 with 6 affords the 1,6-dihydro-1,6-disilapentalene derivatives 7a-d (from 4) and 9a, c (from 5) in almost quantitative yield. This is the result of stereo- and regioselective intermolecular 1,1-organoboration in the first step of the reaction, followed by two consecutive intramolecular 1,1-vinyloborations. The products were characterised by their 1H-, 11B-, 13C-, 29Si- and 119Sn-NMR data.
