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کاتالیزور کاربردی a: عمومی 2012
جزئیات رویداد
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  • new amphiphilic poly(quaternary ammonium) dendrimer catalyst for effective reduction of citronellal

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1051
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    • شماره تماس دبیرخانه رویداد: -
     three types of new amphiphilic poly(quaternary ammonium) dendrimer catalysts were prepared from poly(propylene imine) generation-2 (ppi-g2) dendrimer with 3 types of alkyl halides having varied chain length. the csingle bondh stretching at 2922 and 2853 cm−1 and csingle bondn+ stretching at 1108 cm−1 confirmed the attachment of alkyl chains and generation of poly(quaternary ammonium) ions at the dendrimer surface. their 1h and 13c nmr spectra also supported such confirmations. the hydrophobicity of these 3 poly(quaternary ammonium) based dendrimer catalysts was determined by the static water contact angle (θ). the catalyst derived from attachment of long alkyl chain viz., ppi-g2-(c16h33)16 (ch3)8single bondn+cl− showed an increased contact angle (77.5 θ) thus proving high hydrophobicity. their catalytic activity was evaluated through reduction of citronellal under pseudo-first order condition at ambient temperature. the rate constant (kobs), of the catalyst containing medium length alkyl chain viz., ppi-g2-(c12h25)16 (ch3)8single bondn+cl− was higher than those containing short and long alkyl chains due to its well-balanced amphiphilic character. it gave 100% selectivity/activity compared to commercial single-site phase transfer catalyst for citronellal reduction. the effect of [substrate], [catalyst], [naoh], and [nabh4] on the rate of the reaction was studied and the results were discussed.

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