American Chemical Society
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Reactivity of Scandium Terminal Imido Complex toward Boranes: C(sp3)–H Bond Borylation and B–O Bond Cleavage

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journal contribution
posted on 2017-08-16, 18:09 authored by Jiaxiang Chu, Chen Wang, Li Xiang, Xuebing Leng, Yaofeng Chen
Scandium terminal imido complex [(NNNN)­ScNDIPP] (2; NNNN = [MeC­(N­(DIPP))­CHC­(Me)­(NCH2CH2NMeCH2CH2NMe2)], DIPP = 2,6-iPr2C6H3) reacts with 9-borabicyclononane (9-BBN) to give scandium borohydride [(NNNN­(B)­H)­Sc­(N­(H)­DIPP)] (3; NNNN­(B)H = [MeC­(N­(DIPP))­CHC­(Me)­(NCH2CH2NMeCH2CH2N­(Me)­CH2(BBN)]2–), and C­(sp3)–H bond borylation of the NNNN ligand occurs during this reaction. In contrast, the reaction between complex 2 and catecholborane (CatBH) gives scandium catecholate [(NNNN)­Sc­(Cat)] (4), and B–O bond cleavage happens during this reaction. Both 3 and 4 have been well-characterized including the single-crystal X-ray diffraction analysis. Reaction of 2 with bis­(catecholato)­diboron (CatB–BCat) also gives a B–O bond cleavage product.