The knoevenagel condensation of aromatic aldehydes with ethyl cyanoacetate proceeds smoothly in the presence of potassium fluoride giving products in high yield.

在氟化钾催化下， 芳香醛与氰乙酸乙酯发生克脑文格尔缩合反应，得到高产率的缩合产物。

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Answer: C. Potassium, a mineral found in fruits, vegetables, leafy greens, legumes, and dairy products, helps reduce the rise in blood pressure caused by high-sodium foods.

答案：C。 钾，在水果，蔬菜，绿叶蔬菜，豆类和奶制品中都能找到，帮助降低由于钠摄入过量升高的血压。

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Orange juice, milk, tomato products, and beans are other good sources of dietary potassium.

橙汁，牛奶，番茄类产品和豆类也是钾元素的其他优质来源。

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They are generally less sweet than sucrose (table sugar), so they are often mixed with very sweet artificial sweeteners like aspartame, sucralose and acesulfame potassium, to form a palatable substitute in low sugar, low carbohydrate, and diabetic or "diet" products.

CNN: Is no-sugar ice cream really a healthier alternative?