| 136892-75-6

• CAS: 136892-75-6
• 化学式: C₂₀H₁₄Cr₂O₆
• 分子量: 454.32
• InChiKey: VATHOTCXGKJCSI-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  None
• 重原子数：
  None
• 可旋转键数：
  None
• 环数：
  None
• sp3杂化的碳原子比例：
  None
• 拓扑面积：
  None
• 氢给体数：
  None
• 氢受体数：
  None

反应信息

• 作为反应物：
  描述：

  lithium naphthalene 、 1-碘庚烷 、 在 三氟乙酸 作用下， 以 四氢呋喃 为溶剂， 生成
  参考文献：
  名称：

  双（三羰基铬）配位联苯二价阴离子与亲电试剂反应的机理及其随后的氧化

  摘要：

  Reaction of the (eta(6):eta(6)-biphenyl)bis(tricarbonylchromium) dianion (2) with a wide variety of primary electrophiles results exclusively in an ipso addition. NMR data point out the formation of the endo isomer upon protonation. While a definitive answer is not possible for primary alkyl electrophiles, indirect evidence suggests either a carbanionic type S(N)2 or a metal-assisted endo addition to the ipso position. Reaction with cyclopropylcarbinyl bromide as well as 6-bromo-1-hexene suggests an inner-sphere polar S(N)2 mechanism for most of the primary electrophiles. However, easily reduced halides such as allylic and benzylic or those halides which have steric hindrance toward S(N)2 processes may well proceed via an electron-transfer process or a combination of S(N)2 and electron-transfer processes. 1,2-Aryl migration has been found to be the predominant pathway in the oxidative cleavage of the alkylated (eta(6):eta(6)-4,4'-dimethylbiphenyl)bis(tri-carbonylchromium) dianion (6), thereby indicating a cationic intermediate in the mechanism of this step. Alkylation followed by iodine oxidation of 4,4'-disubstituted biphenyls provides a short convenient approach to 2-alkyl-5,4'-disubstituted biphenyls.

  DOI：

  10.1021/om00037a051
• 作为产物：
  描述：

  4,4'-二甲基联苯 、 六羰基铬 以 四氢呋喃 、 二丁醚 为溶剂， 以36%的产率得到
  参考文献：
  名称：

  双（三羰基铬）配位联苯二价阴离子与亲电试剂反应的机理及其随后的氧化

  摘要：

  Reaction of the (eta(6):eta(6)-biphenyl)bis(tricarbonylchromium) dianion (2) with a wide variety of primary electrophiles results exclusively in an ipso addition. NMR data point out the formation of the endo isomer upon protonation. While a definitive answer is not possible for primary alkyl electrophiles, indirect evidence suggests either a carbanionic type S(N)2 or a metal-assisted endo addition to the ipso position. Reaction with cyclopropylcarbinyl bromide as well as 6-bromo-1-hexene suggests an inner-sphere polar S(N)2 mechanism for most of the primary electrophiles. However, easily reduced halides such as allylic and benzylic or those halides which have steric hindrance toward S(N)2 processes may well proceed via an electron-transfer process or a combination of S(N)2 and electron-transfer processes. 1,2-Aryl migration has been found to be the predominant pathway in the oxidative cleavage of the alkylated (eta(6):eta(6)-4,4'-dimethylbiphenyl)bis(tri-carbonylchromium) dianion (6), thereby indicating a cationic intermediate in the mechanism of this step. Alkylation followed by iodine oxidation of 4,4'-disubstituted biphenyls provides a short convenient approach to 2-alkyl-5,4'-disubstituted biphenyls.

  DOI：

  10.1021/om00037a051

文献信息

• Reactivity of some “ladder” type complexes under conditions of metallation
  作者：T. Yu. Orlova、Yu. S. Nekrasov、P. V. Petrovskii、M. G. Ezernitskaya、T. V. Magdesieva、S. V. Milovanov、K. P. Butin

  DOI：10.1007/bf02495706

  日期：1998.9

  The behavior of binuclear “ladder” type complexes FpL, where Fp=Cp(CO)2Fe, L=p-MeC6H4Cr(CO)3 (4), CH2C6H5Cr(CO)3 (5), andp-FpC6H4Cr(CO)3 (6), under conditions of metallation was studied. Unlike compounds5 and6, the σ-bound ligand L in compound4 migrates from the iron atom to the cyclopentadienyl ring to give complexes Me(CO)2FeC5H4−C6H4(p-Me)Cr(CO)3. The electrochemical reduction potentials of the

  双核“阶梯”型配合物 FpL 的行为，其中 Fp=Cp(CO)2Fe, L=p-Me Cr(CO)3 (4), CH2C6H5Cr(CO)3 (5), and p-Fp Cr(CO)3 ( 6)、在金属化条件下进行了研究。与化合物 5 和 6 不同，化合物 4 中的 σ 结合配体 L 从铁原子迁移到环戊二烯基环，生成配合物 Me(CO)2FeC5H4-C6H4(p-Me)Cr(CO)3。测量了配合物 4-6 和重排产物的电化学还原电位。L 的迁移活性取决于 Fe-L 键还原裂解的难易程度和系统从 Cp 配体到芳环的分子内电子转移的敏感性。