4-ethylpent-2-enedioc acid dimethyl ester | 859982-19-7

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 脂肪酰基
• 英文名称: 4-ethylpent-2-enedioc acid dimethyl ester
• CAS: 859982-19-7
• 化学式: C₉H₁₄O₄
• 分子量: 186.208
• InChiKey: JKZCPBPBNUPBJT-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  0.91
• 重原子数：
  13.0
• 可旋转键数：
  4.0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.56
• 拓扑面积：
  52.6
• 氢给体数：
  0.0
• 氢受体数：
  4.0

反应信息

• 作为产物：
  描述：

  以 二氯甲烷-D2 为溶剂， 反应 48.0h， 生成 4-ethylpent-2-enedioc acid dimethyl ester
  参考文献：
  名称：

  Mechanistic Insights on Acrylate Insertion Polymerization

  摘要：

  Complexes [{(P boolean AND O)PdMe}(n)] (1(n); P boolean AND O = kappa(2)-P,O-Ar2PC6H4SO2O with Ar = 2-MeOC6H4) are a single-component precursor of the (P boolean AND O)PdMe fragment devoid of additional coordinating ligands, which also promotes the catalytic oligomerization of acrylates. Exposure of 1(n) to methyl acrylate afforded the two diastereomeric chelate complexes [(P boolean AND O)Pd{kappa(2)-C,O-CH(C(O)OMe)CH2CH(C(O)OMe)CH2CH3}] (3-meso and 3-rac) resulting from two consecutive 2,1-insertions of methyl acrylate into the Pd-Me bond with the same or opposite stereochemistry, respectively, in a 3:2 ratio as demonstrated by comprehensive NMR spectroscopic studies and single crystal X-ray diffraction. These six-membered chelate complexes are direct key models for intermediates of acrylate insertion polymerization, and also ethylene-acrylate copolymerization to high acrylate content copolymers. Studies of the binding of various substrates (pyridine, dmso, ethylene and methyl acrylate) to 3-meso and 3-rac show that hindered displacement of the chelating carbonyl moiety by pi-coordination of incoming monomer significantly retards, but does not prohibit, polymerization. For 3-meso,3-rac + C2H4 reversible arrow 3-meso-C2H4, 3-rac-C2H4 an equilibrium constant K(353 K) approximate to 2 x 10(-3) L mol(-1) was estimated. Reaction of 3-meso, 3-rac with methyl acrylate afforded higher insertion products [(P boolean AND O)Pd(C4H6O2)(n)Me] (n = 3, 4) as observed by electrospray ionization mass spectrometry (ESI-MS). Theoretical studies by DFT methods of consecutive acrylate insertion provide relative energies of intermediates and transition states, which are consistent with the aforementioned experimental observations, and give detailed insights to the pathways of multiple consecutive acrylate insertions. Acrylate insertion into 3-meso,3-rac is associated with an overall energy barrier of ca. 100 kJ mol(-1).

  DOI：

  10.1021/ja910760n

文献信息

• Activation and Deactivation of Neutral Palladium(II) Phosphinesulfonato Polymerization Catalysts
  作者：Thomas Rünzi、Ulrich Tritschler、Philipp Roesle、Inigo Göttker-Schnetmann、Heiko M. Möller、Lucia Caporaso、Albert Poater、Luigi Cavallo、Stefan Mecking

  DOI：10.1021/om300969d

  日期：2012.12.10

  3CH3)P,O] (13) isolated from pressure reactor polymerization experiments. In addition, ESI-MS analyses of reactor polymerization filtrates indicate the presence of (odd- and even-numbered alkyl)(anisyl)phosphine sulfonates (14) and their respective phosphine oxides (15). Furthermore, 2-(vinyl)anisole was detected in NMR tube and reactor polymerizations, which results from ethylene insertion into a

  13 C标记的乙烯聚合（预）催化剂[κ 2 - （茴香基）2 P，O ]将Pd（13 CH 3）（L）（1- 13 CH 3 -L）（L =吡啶，DMSO）基于二（2-茴香基）膦苯磺酸盐用于评估13个CH 3基团向形成的聚乙烯中的结合程度。可变反应时间的聚合显示出约。在已经经过1分钟的聚合时间后，在聚合物中发现了60–85％的13 C-标记，这提供了证据表明催化剂前体1- 13 CH 3 -L之间存在预平衡活性物种1- 13 CH 3-（乙烯）链增长快。引发链增长的1- 13 CH 3 -L分数可能高于13 C-标记的聚合物链端确定的60-85％，因为（a）链行走导致13 C-链内掺入。标记，（b）通过形成饱和（和部分挥发性）烷烃而导致不可逆的催化剂失活减少了掺入聚合物中的13 CH 3基团的量，以及（c）钯键结合的13 CH 3基团，以及更一般的钯键结合的烷基（聚合物基）链，通过还原消除