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Solution structures of dimeric methylpyrazolyl and indazolyl dimethyl-derivatives of boron, gallium, and indium from 1 H nuclear magnetic resonance data

1979; NRC Research Press; Volume: 57; Issue: 18 Linguagem: Inglês

10.1139/v79-403

1480-3291

L. K. Peterson, Kwat I. Thé,

Organometallic Complex Synthesis and Catalysis

Trimethylboron and trimethylgallium react with 3-methylpyrazole to yield isomer pairs of dimeric products [Me 2 E(Mepz)] 2 (E = B, Ga; Mepz = 3-methylpyrazolyl), in the approximate ratios 4:3 (E = B) and 9:1 (E = Ga), while trimethylindium gives a single species. Reactions of indazole with trimethylgallium and trimethylindium also yield a single structural isomer of the dimer [Me 2 Eind] 2 (E = Ga, In; ind = indazolyl). Solution structures were interpreted on the basis of 1 H nmr data.