以下为句子列表：
英文: This method, however, involves using a large excess of diethyl carbonate (for example, 4-8 mols.); it also involves preparing sodium ethylate by dissolving sodium metal in ethanol, which process must be carried out very slowly and carefully if it is to be
中文: 但是这一方法涉及到使用大量过量的二乙基碳酸酯（例如，4-8摩尔）；同时也涉及到在乙醇中溶解纳来制备乙醇纳的反应，这个过程必须非常缓慢小心地进行，如果在工业生产级别上是用这一方法就比较麻烦了。
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英文: We have now found that if the reaction is carried out in presence of a hydrocarbon which boils above 100°C, for example toluene, then much or all of the excess of the expensive diethyl carbonate can be replaced by the hydrocarbon.
中文: 我们现在发现如果反应在一种沸点在一百摄氏度以上的碳氢化合物中，例如甲苯中进行，那么大部分或者全部的过量的昂贵的二乙基碳酸酯就可以被碳氢化合物所取代。
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