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Alumina grafted SBA-15 sustainable bifunctional catalysts for direct cross-coupling of benzylic alcohols to diarylmethanes
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020-03-18 , DOI: 10.1039/d0cy00471e Chandran Rajendran 1, 2, 3, 4, 5 , Govindaswamy Satishkumar 1, 2, 3, 4, 5 , Charlotte Lang 6, 7, 8, 9 , Eric M. Gaigneaux 6, 7, 8, 9
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020-03-18 , DOI: 10.1039/d0cy00471e Chandran Rajendran 1, 2, 3, 4, 5 , Govindaswamy Satishkumar 1, 2, 3, 4, 5 , Charlotte Lang 6, 7, 8, 9 , Eric M. Gaigneaux 6, 7, 8, 9
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AlSBA-15 catalysts possessing Brønsted acid and Lewis acid–base bifunctionalities catalyze the direct arylation of benzyl alcohols to diarylmethanes with an 85% product yield through C–O bond activation. 2 and 4wt%AlSBA-15 catalysts have been synthesised by adopting a simple and efficient post-synthetic metal implantation route. The synthesised catalysts were characterized using XRD, N2 adsorption and desorption, 27Al MAS NMR, XPS, HR-TEM, NH3 and CO2-temperature-programmed desorption (TPD) and pyridine-transmission-FTIR spectroscopy techniques to confirm the existence of Brønsted acid and Lewis acid–base bifunctionalities. Through various control experiments, it is verified that Brønsted acid sites activate the benzyl alcohol and Lewis base sites interact with phenylboronic acid concurrently to accomplish the coupling reaction. In the recyclability study, 4wt%AlSBA-15 preserves its activity and stability up to 5 cycles. The 4wt%AlSBA-15 catalyst unlike homogeneous catalysts does not require additives, long reaction time and expensive metals.
中文翻译：
氧化铝接枝的SBA-15可持续双功能催化剂，用于苯甲醇直接交叉偶联到二芳基甲烷
具有布朗斯台德酸和路易斯酸碱双官能度的AlSBA-15催化剂可催化苄醇直接芳基化为二芳基甲烷，并通过C-O键活化获得85％的产率。通过采用简单有效的合成后金属注入途径，合成了2wt％和4wt％AlSBA-15催化剂。用XRD，N 2吸附和解吸，27 Al MAS NMR，XPS，HR-TEM，NH 3和CO 2表征合成的催化剂。程序升温脱附（TPD）和吡啶传递FTIR光谱技术确定了布朗斯台德酸和路易斯酸碱双官能团的存在。通过各种控制实验，证实布朗斯台德酸位点激活苯甲醇，路易斯碱位点同时与苯硼酸相互作用，完成偶联反应。在可回收性研究中，4wt％AlSBA-15最多可保留5个循环的活性和稳定性。与均相催化剂不同，4wt％AlSBA-15催化剂不需要添加剂，较长的反应时间和昂贵的金属。
更新日期：2020-03-18
中文翻译：
氧化铝接枝的SBA-15可持续双功能催化剂，用于苯甲醇直接交叉偶联到二芳基甲烷
具有布朗斯台德酸和路易斯酸碱双官能度的AlSBA-15催化剂可催化苄醇直接芳基化为二芳基甲烷，并通过C-O键活化获得85％的产率。通过采用简单有效的合成后金属注入途径，合成了2wt％和4wt％AlSBA-15催化剂。用XRD，N 2吸附和解吸，27 Al MAS NMR，XPS，HR-TEM，NH 3和CO 2表征合成的催化剂。程序升温脱附（TPD）和吡啶传递FTIR光谱技术确定了布朗斯台德酸和路易斯酸碱双官能团的存在。通过各种控制实验，证实布朗斯台德酸位点激活苯甲醇，路易斯碱位点同时与苯硼酸相互作用，完成偶联反应。在可回收性研究中，4wt％AlSBA-15最多可保留5个循环的活性和稳定性。与均相催化剂不同，4wt％AlSBA-15催化剂不需要添加剂，较长的反应时间和昂贵的金属。
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