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Aspect of crudes of Knoevenagel condensations to vanillin barbiturate (1) carried out in the presence of 100 g of milling beads in HDPE vessel of 150 mL (30–50 g scale, 100–170 mmol o‐vanillin). The reaction was conducted at: a) 80 g during 20 min of cycled mixing; b) 100 g during 40 min of cycled mixing, and c) 100 g during 30 min of continuous mixing.
