oxygen with the potassium salt derived from deprotonation of the hydroquinone form of vitamin K. From that value (-33.52±0.60 kcal/mol), the heat of deprotonation of vitamin KH 2 (-30.03±1.20 kcal/mol), and the heat of deprotonation of water (-6.05±0.3 kcal/mol), the enthalpy change for converting vitamin KH 2 to vitamin K oxide is established to be -57.5 kcal/mol, in reasonable agreement with our previous
萘氢醌阴离子的新氧化反应的发现使得测定氧与
钾盐的反应热 (ΔH ox ) 成为可能,该
钾盐源自
维生素 K 的
氢醌形式的去质子化。从该值 (-33.52±0.60 kcal/mol )、
维生素 KH 2 的去质子化热 (-30.03±1.20 kcal/mol) 和
水的去质子化热 (-6.05±0.3 kcal/mol),
维生素 KH 2 转化为
维生素 K 氧化物的焓变为确定为 -57.5 kcal/mol,与我们之前估计的母体
萘氢醌氧化的 -62.4 kcal/mol 合理一致