N,N'-dimethyl-2,2'-biphenyldiacetohydroxamic acid | 1088399-24-9

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: N,N'-dimethyl-2,2'-biphenyldiacetohydroxamic acid
• 英文别名: HoxH2
• CAS: 1088399-24-9
• 化学式: C₁₈H₂₀N₂O₄
• 分子量: 328.368
• InChiKey: MZQUNANUXRRNEB-UHFFFAOYSA-N

反应信息

• 作为反应物：
  描述：

  titanium(IV) isopropylate 、 N,N'-dimethyl-2,2'-biphenyldiacetohydroxamic acid 以 苯 为溶剂， 以83%的产率得到((R),Λ)/((S),Δ)-cis-α-Ti(N,N'-dimethyl-2,2'-biphenyldiacetohydroxamato)(isopropoxide)2
  参考文献：
  名称：

  Tetradentate Bis(hydroxamate) and Hydroxamate-Diketonate Ligands and Their Titanium(IV) Complexes

  摘要：

  A 2,2'-bis(methylene)biphenyl-bridged bis(hydroxamic acid) (HoxH(2)) is prepared by reaction of 2,2'-biphenyldiacetyl chloride with 2 equiv of N-methylhydroxylamine. Use of 1 equiv of CH3NHOH gives the cyclic diacylhydroxylamine, which is selectively ring-opened to give a mixed monohydroxamate-monodiketonate ligand HobH(2). Both ligands are metalated by Ti((OPr)-Pr-i)(4) to give the corresponding LTi((OPr)-Pr-i)(2) complexes as exclusively the cis-alpha, (R)-Lambda/(S)-Delta isomers, similar to the previously prepared bis(diketonate) analogues (Bob)TiX2. The carbonyl oxygens of the hydroxamates in the Hox ligand are constrained to be cis to each other, and the crystal structure of (Hob)Ti((OPr)-Pr-i)(2) suggests that the carbonyl oxygen is a slightly weaker donor than the diketonate oxygen, based on a modest difference in their trans influences. A differential trans effect is also manifest in the observation of only a single geometric isomer of (Hob)Ti((OPr)-Pr-i)(O3SCF3) and in a 15.6:1 preference for the isomer of (Hob)Ti(OCH2CMe2CO2) in which the alkoxide is trans to the hydroxamate ligand.

  DOI：

  10.1021/ic8016479