英语语法分析

A new solid base catalyst of calcium methoxide was made with calcium carbonate as the starting material.

以碳酸钙为基础材料，制成高效酯交换催化剂甲醇钙。

Dimethyl carbonate is synthesized directly from carbon dioxide and methanol in the presence of magnesium methoxide.

报道一种在甲醇镁作用下，由二氧化碳及甲醇直接合成碳酸二甲酯的反应过程。

Compared with the activity of sodium methoxide, sodium ethoxide, sodium isopropyl, sodium tert-butoxide, the best base catalyst was sodium tert-butoxide.

比较甲醇钠、乙醇钠、异丙醇钠和叔丁醇钠催化活性，叔丁醇钠为最佳的催化剂。