3 years ago

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

Reactivity of Scandium Terminal Imido Complex toward Boranes: C(sp3)–H Bond Borylation and B–O Bond Cleavage
Xuebing Leng, Jiaxiang Chu, Li Xiang, Yaofeng Chen, Chen Wang
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.

Publisher URL: http://dx.doi.org/10.1021/acs.organomet.7b00452

DOI: 10.1021/acs.organomet.7b00452

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