2,6-Dimethyl-1,4-naphthohydrochinon | 690228-98-9

• 分子结构分类: 有机化合物 - 苯类化合物 - 萘
• 英文名称: 2,6-Dimethyl-1,4-naphthohydrochinon
• 英文别名: 2,6-dimethyl-naphthalene-1,4-diol；2,6-Dimethyl-naphthalin-1,4-diol；1.4-Dihydroxy-2.6-dimethyl-naphthalin；2,6-Dimethylnaphthalene-1,4-diol；2,6-dimethylnaphthalene-1,4-diol
• CAS: 690228-98-9
• 化学式: C₁₂H₁₂O₂
• 分子量: 188.226
• InChiKey: FJUKNFHPNLGNOQ-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.2
• 重原子数：
  14
• 可旋转键数：
  0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.17
• 拓扑面积：
  40.5
• 氢给体数：
  2
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  2,6-Dimethyl-1,4-naphthohydrochinon 在 盐酸 、 溶剂黄146 作用下， 生成 5,9-dihydroxy-2,6,11-trimethyl-dibenzo[c,h]xanthenylium; chloride
  参考文献：
  名称：

  Anthocyanidin-Like Pigments from α-Naphthohydroquinones

  摘要：

  DOI：

  10.1021/ja01851a022
• 作为产物：
  描述：

  2,6-dimethyl-1,4-naphthoquinone 在 乙醇 、 溶剂黄146 、 锌 作用下， 生成 2,6-Dimethyl-1,4-naphthohydrochinon
  参考文献：
  名称：

  SYNTHESES AND REACTIONS OF SUBSTITUTED α-NAPHTHOQUINONES

  摘要：

  DOI：

  10.1021/jo01219a005

文献信息

• The Scaling of Mixed-Item-Format Tests With the One-Parameter and Two-Parameter Partial Credit Models
  作者：Robert C. Sykes、Wendy M. Yen

  DOI：10.1111/j.1745-3984.2000.tb01084.x

  日期：2000.9

  Item response theory scalings were conducted for six tests with mixed item formats. These tests differed in their proportions of constructed response (c.r.) and multiple choice (m.c.) items and in overall difficulty. The scalings included those based on scores for the c.r. items that had maintained the number of levels as the item rubrics, either produced from single ratings or multiple ratings that were averaged and rounded to the nearest integer, as well as scalings for a single form of c.r. items obtained by summing multiple ratings. A one‐parameter (IPPC) or two‐parameter (2PPC) partial credit model was used for the c.r. items and the one‐parameter logistic (IPL) or three‐parameter logistic (3PL) model for the m.c. items, ltem fit was substantially worse with the combination IPL/IPPC model than the 3PL/2PPC model due to the former's restrictive assumptions that there would be no guessing on the m.c. items and equal item discrimination across items and item types. The presence of varying item discriminations resulted in the IPL/IPPC model producing estimates of item information that could be spuriously inflated for c.r. items that had three or more score levels. Information for some items with summed ratings were usually overestimated by 300% or more for the IPL/IPPC model. These inflated information values resulted in under‐estbnated standard errors of ability estimates. The constraints posed by the restricted model suggests limitations on the testing contexts in which the IPL/IPPC model can be accurately applied.
• Fieser, Journal of the American Chemical Society, 1939, vol. 61, p. 2559,3467, 3474
  作者：Fieser

  DOI：——

  日期：——
• SYNTHESES AND REACTIONS OF SUBSTITUTED α-NAPHTHOQUINONES
  作者：ERNST BERGMANN、FELIX BERGMANN

  DOI：10.1021/jo01219a005

  日期：1938.5
• Anthocyanidin-Like Pigments from α-Naphthohydroquinones
  作者：Mary Fieser、Louis F. Fieser

  DOI：10.1021/ja01851a022

  日期：1941.6