设计并合成了三种用于自由基可见光聚合的新型可光漂白 D-π-A-π-A' 型双查耳酮肟酯染料 (TAs)。它们的结构经1 H NMR、13 C NMR 和 HR-MS 证实。通过对电子顺磁共振(EPR)和稳态光解实验的分析,提出了自由基产生的机理。酮羰基和乙烯基自由基通过肟酯中 N-O 键的均裂产生氧烷基自由基表明染料 TA 是 I 型和 II 型光引发剂的整合体. 光聚合实验表明,以1, 6-己二醇二丙烯酸酯(HDDA)为单体,在LED@455 nm曝光下,TAs可以有效地引发光聚合。此外,由 TAs 引发的固化膜萃取率低。特别是具有亚苄基环戊酮肟酯的TA2表现出最好的双键转化效率和光漂白特性。无色散装通过TA2引发的光聚合,可以获得厚度达32 mm的丙烯酸酯材料。研究还表明,肟酯染料是获得自由基的重要来源,自由基可以通过 N-O 键的均裂产生。因此,该研究成果为染料的结构设计开辟了新的
设计并合成了三种用于自由基可见光聚合的新型可光漂白 D-π-A-π-A' 型双查耳酮肟酯染料 (TAs)。它们的结构经1 H NMR、13 C NMR 和 HR-MS 证实。通过对电子顺磁共振(EPR)和稳态光解实验的分析,提出了自由基产生的机理。酮羰基和乙烯基自由基通过肟酯中 N-O 键的均裂产生氧烷基自由基表明染料 TA 是 I 型和 II 型光引发剂的整合体. 光聚合实验表明,以1, 6-己二醇二丙烯酸酯(HDDA)为单体,在LED@455 nm曝光下,TAs可以有效地引发光聚合。此外,由 TAs 引发的固化膜萃取率低。特别是具有亚苄基环戊酮肟酯的TA2表现出最好的双键转化效率和光漂白特性。无色散装通过TA2引发的光聚合,可以获得厚度达32 mm的丙烯酸酯材料。研究还表明,肟酯染料是获得自由基的重要来源,自由基可以通过 N-O 键的均裂产生。因此,该研究成果为染料的结构设计开辟了新的
Enantioselective organocatalytic conjugate addition of α-nitroacetate to α,β-unsaturated ketones in water
作者:Hyoung Wook Moon、Dae Young Kim
DOI:10.1016/j.tetlet.2010.03.105
日期:2010.5
catalytic enantioselectiveconjugateaddition reaction of α-nitroacetate to α,β-unsaturated ketones promoted by chiral bifunctional organocatalysts is described. The treatment of α-nitroacetate to α,β-unsaturated ketones under aqueous-phase reaction conditions afforded the corresponding Michael adducts with high enantioselectivity. The conjugateaddition adducts are easily converted to chiral δ-keto nitroalkanes
Organocatalytic Enantioselective Michael Addition of α-Nitroacetate to α,β-Unsaturated Enones: A Route to Chiral γ-Nitro Ketones and δ-Keto Esters
作者:Hyoung-Wook Moon、Dae-Young Kim
DOI:10.5012/bkcs.2011.32.1.291
日期:2011.1.20
The catalytic enantioselectiveconjugateaddition reaction of α-nitroacetate to α,β-unsaturated enones promoted by chiral bifunctional organocatalysts is described. The treatment of α-nitroacetate to α,β-unsaturated enones afforded the corresponding Michael adducts with high enantioselectivity. The conjugateaddition adducts are easily converted to chiral γ-nitro ketones and δ-keto esters.
From Calcium Interaction to Calcium Electrochemical Detection by [(C<sub>5</sub>H<sub>5</sub>)Fe(C<sub>5</sub>H<sub>4</sub>COCHCHC<sub>6</sub>H<sub>4</sub>NEt<sub>2</sub>)] and Its Two Novel Structurally Characterized Derivatives
[(C5H5)Fe(C5H4COCH=CHC6H4NEt2)] (1) has been electrochemically evaluated toward different cations in solution. Calcium sensing by this compound and its two new derivatives [(C5H5)Fe(C5H4CO(CH=CH)(2)C6H4NMe2)] (2) and [(C5H5)Fe(C5H4CH=CHCOCH=CHC6H4NEt2)] (3) that exhibit a conjugated link between the ferrocene unit and the nitrogen atom has been thoroughly examined. Compounds 2 and 3 have been structurally characterized by single-crystal X-ray diffraction studies. The three related protonated species [1H][BF4] (4), [2H][BF4] (5), and [3H][BF4] (6) have been isolated in a good yield. NMR experiments clearly established that calcium interaction occurs in the vicinity of the carbonyl group, and mass spectrometry studies confirmed that this interaction, which involves several ligand-Ca2+ adducts, is complex. A combination of electrochemical and NMR experiments highlighted an original salt influence on the electrochemical calcium sensing result.