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Also attempted cyclizations of 1e with 3 or 4 equiv of KOH (at 40 °C) remained unsuccessful. At 100 °C (using 2 equiv of KOH) only traces of 2b were detected after 22.5 h.
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Also attempted cyclizations of 1e with 3 or 4 equiv of KOH (at 40 °C) remained unsuccessful. At 100 °C (using 2 equiv of KOH) only traces of 2b were detected after 22.5 h.
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Even at 70 bar of hydrogen pressure (RT, 22 h) formation of 3a was not observed, and the yield of 1-(cyclohexylmethyl)-3-phenyl-1,3- dihydrobenzoimidazol-2-one was only 32%.
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