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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >ZnAlMCM-41: a very ecofriendly and reusable solid acid catalyst for the highly selective synthesis of 1,3-dioxanes by the Prins cyclization of olefins
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ZnAlMCM-41: a very ecofriendly and reusable solid acid catalyst for the highly selective synthesis of 1,3-dioxanes by the Prins cyclization of olefins

机译：Znalmcm-41：通过烯烃的纯化环化的纯净环化的高度选择性合成1,3-二氧烷基的非常繁华和可重复使用的固体酸催化剂

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摘要

The Prins cyclization of styrene (SE) with paraformaldehyde (PFCHO) was conducted with mesoporous ZnAlMCM-41 catalysts for the synthesis of 4-phenyl-1,3-dioxane (4-PDO) using a liquid phase heterogeneous catalytic method. For a comparison study, the Prins cyclization reaction was also conducted over different nanoporous catalysts, e.g. mesoporous solid acid catalysts, AlMCM-41(21) and ZnMCM-41(21), and microporous catalysts, USY, H beta, HZSM-5, and H-mordenite. The recyclable mesoporous ZnAlMCM-41 catalysts were reused in this reaction to evaluate their catalytic stabilities. Since ZnAlMCM-41(75) has higher catalytic activity than other solid acid catalysts, washed ZnAlMCM-41(75)/W-ZnAlMCM-41(75) was prepared using an efficient chemical treatment method and used with various reaction parameters to find an optimal parameter for the highly selective synthesis of 4-PDO. W-ZnAlMCM-41(75) was also used in the Prins cyclization of olefins with PFCHO and formalin (FN, 37% aqueous solution of formaldehyde (FCHO)) under different reaction conditions to obtain 1,3-dioxanes, which are widely used as solvents or intermediates in organic synthesis. Based on the nature of catalysts used under different reaction conditions, a reasonable plausible reaction mechanism for the Prins cyclization of SE with PFCHO is proposed. Notably, it can be seen from the catalytic results of all catalysts that the W-ZnAlMCM-41(75) catalyst has higher 4-PDO selectivity with exceptional catalytic activity than other microporous and mesoporous catalysts.
机译：用介孔ZnAlMCM-41催化剂对苯乙烯（SE）与多聚甲醛（PFCHO）的普林斯环化反应进行了研究，采用液相多相催化法合成了4-苯基-1,3-二氧六环（4-PDO）。为了进行比较研究，还对不同的纳米多孔催化剂进行了普林斯环化反应，例如介孔固体酸催化剂AlMCM-41（21）和ZnMCM-41（21），以及微孔催化剂USY、Hβ、HZSM-5和H丝光沸石。将可回收的介孔ZnAlMCM-41催化剂重新用于该反应，以评估其催化稳定性。由于ZnAlMCM-41（75）具有比其他固体酸催化剂更高的催化活性，因此使用高效的化学处理方法制备了洗涤后的ZnAlMCM-41（75）/W-ZnAlMCM-41（75），并与各种反应参数一起使用，以寻找高选择性合成4-PDO的最佳参数。W-ZnAlMCM-41（75）还用于烯烃与PFCHO和福尔马林（FN，37%甲醛水溶液（FCHO））在不同反应条件下的普林斯环化反应，以获得广泛用作有机合成溶剂或中间体的1,3-二恶烷。根据不同反应条件下所用催化剂的性质，提出了硒与PFCHO的普林斯环化反应机理。值得注意的是，从所有催化剂的催化结果可以看出，与其他微孔和介孔催化剂相比，W-ZnAlMCM-41（75）催化剂具有更高的4-PDO选择性和优异的催化活性。

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