• hydroaminomethylation of eugenol with di-n-butylamine catalyzed by rhodium complexes: bringing light on the promoting effect of brönsted acids

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1073
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the hydroaminomethylation of eugenol with di-n-butylamine was performed employing a bis[(1,5-ciclooctadiene)(μ-methoxy)rhodium(i)] as pre-catalyst. in the absence of phosphines, the catalyst was efficient in the process, but the regioselectivity for amines was poor. for phosphine-promoted catalyst, the chemoselectivity at the hydroformylation step improved, but the hydrogenation of enamine intermediates was hampered. the regioselectivity within the class of amines was surprisingly high (>96%) for the linear product. the addition of triflic acid (10–20 mol%) improved significantly the efficiency of ham. employing the 2,2′-bis((diphenylphosphino)methyl)-1,1′-binaphthyl as ancillary and triflic acid as a promoter, the linear product was obtained in up to 93% yield.

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