668987-53-9Relevant articles and documents
Unusual reactivities of linear disilanes with o-carboranyl unit
Lee, Young-Joo,Lee, Jong-Dae,Kim, Sung-Joon,Yoo, Byung Woo,Ko, Jaejung,Suh, Il-Hwan,Cheong, Minserk,Kang, Sang Ook
, p. 490 - 497 (2008/10/09)
The linear disilanes l,2-bis(1′-R-o-carboranyl)-1,1,2,2-tetramethyl-1,2-disilane (R = H (2a), Me (2b), Ph (2c)) were prepared by reacting the lithium salt of 1-R-o-carborane (1) with 1,2-dichlorotetramethyldisilane. These linear disilanes (2) were found to be useful precursors for the synthesis of a variety of cyclic compounds. For instance, reaction of the linear dilithiodisilane 2a with 1,2-dichlorotetramethyldisilane afforded the four-membered cyclic compound 3,4-o-carboranylene-1,1,2,2-tetramethyl-1,2-disilacyclobutane (3). Further, whereas the reaction of linear disilane (2a) with Pt(PEt3)3 was found to yield the cyclic bis(silyl)platinum complex 4, the reaction of the methyl-o-carboranyl-substituted disilane 2b with Pt(PEt3)3 under the same conditions yielded the decomposed bis(silyl)platinum complex 5, formed via oxidative addition of a Si-Si bond at the platinum atom. The reaction of the cyclic disilane 3 using a catalytic amount of lithium metal afforded a five-membered cyclic trisilyl compound (6). The reaction of 6 with phenylacetylene in the presence of a catalytic amount of Pd(CNBut)2 was found to yield the seven-membered trisilyl ring compound 6,7-o-carboranylene-1,1,4,4,5,5-hexamethyl-2-phenyl-l,4,5-trisilacyclohept-2-ene (7). The structures of compounds 2a,b, 4-6, and 7 were determined using single-crystal X-ray crystallography.