2008年6月30日 · Fluoroboric acid adsorbed on silica-gel (HBF 4 –SiO 2) has been found to be a new and highly efficient heterogeneous catalyst for thia-Michael addition to α,β-unsaturated carbonyl compounds under solvent-free conditions. In the case of 1,3-diaryl-2-propenones, the reactions are best carried out in MeOH.

在吸附在硅胶 (HBF4-SiO2) 上的四氟硼酸的催化作用下，用原甲酸三甲酯 (TMOF) 或原甲酸三乙酯 (TEOF) 处理可以将醛和酮保护为缩醛和缩酮。 对于具有高度亲电羰基的醛或酮，反应在无溶剂条件下进行。

氟硼酸，是一种无机化合物，化学式为HBF4。 氟硼酸只能在水溶液中存在，属于强无机酸，电离产生的BF4-离子呈四面体。 外观为无色透明液体，能与水和醇混溶，主要用于金属表面氧化物、硅酸盐膜的清洁和腐蚀剂等。

2010年5月15日 · In this communication, we wish to report simple and efficient method for the synthesis of thiomorpholides from various aryl alkyl ketones with sulfur and morpholine using solid-supported fluoroboric acid (HBF 4 –SiO 2) and evaluated for their effect on kinetic parameters of E. carotovora asparaginase and antioxidant activity (Scheme 1). Scheme 1.

The remarkable catalytic activity that HBF4–SiO2 exhibited is convincingly superior to other recently reported catalytic methods with respect to high conversions, operational simplicity, enhanced reaction rates, cleaner reaction profiles, ease of isolation of products, inexpensive and ready availability of the catalyst makes the procedure an ...

2008年6月30日 · HBF4/SiO2 was used as an efficient, green, and inexpensive catalytic system for synthesis of 12-aryl or 12-alkyl-8,9,10,12-tetrahydro-11H-benzo [a]xanthen-11-one derivatives via a one-pot…

描述了在催化量的固体负载的氟硼酸（HBF 4 -SiO 2）存在下合成硫吗啉化物的有效无溶剂方法。该方法的优点是产率高，反应时间短，产物分离容易，成本低，并且催化剂可以循环使用多次而不会显着降低活性。三个thiomorpholides具有给电子基团（图4c，4克，和4H）分别显示出对优异的刺激活性软腐病 升 ...

2008年6月30日 · Fluoroboric acid adsorbed on silica-gel (HBF (4)-SiO (2)) has been found to be a new and highly efficient heterogeneous catalyst for thia-Michael addition to...

2007年8月1日 · HBF4/SiO2 was used as an efficient, green, and inexpensive catalytic system for synthesis of 12-aryl or 12-alkyl-8,9,10,12-tetrahydro-11H-benzo [a]xanthen-11-one derivatives via a one-pot…

2010年5月15日 · An efficient solvent-free procedure for the synthesis of thiomorpholides in the presence of a catalytic amount of solid-supported fluoroboric acid (HBF (4)-SiO (2)) is described.