reaction rate and higher selectivity in the selectiveoxidation of benzyl alcohol with H2O2 in water. More importantly, the di-imidazolium IL cations imparted a reaction controlled phase transfer function to the PW hybrids. The catalysts were thus precipitated from the aqueous system upon consumption of H2O2 and could be reused several times without loss of activity and selectivity.
通过在水中将PEG桥连的二咪唑鎓阳离子交换HPW的质子来制备基于Keggin型磷钨酸(H 3 PW 12 O 40,HPW)的二咪唑鎓离子液体(IL)杂化物。表征结果表明完整的Keggin型[PW 12 O 40 ] 3−通过离子相互作用将阴离子与各种PEG改性的二咪唑鎓阳离子结合,得到具有Gemini结构的基于PW的离子催化剂。PEG桥联的二咪唑阳离子不仅可以微调PW阴离子的氧化还原特性,而且可以增强催化剂在水性体系中的相容性,从而改善其催化性能。此外,将两个催化位点组合成一个分子会强制执行分子内协作反应途径,从而进一步提高了反应速率,并提高了用H 2 O 2选择性氧化苄醇的选择性。在水里。更重要的是,二咪唑类IL阳离子赋予了PW杂化物以反应控制的相转移功能。因此,当消耗H 2 O 2时,催化剂从水性体系中沉淀出来,可以重复使用几次,而不会损失活性和选择性。
Reusable chiral salen Mn(III) complexes with phase transfer capability efficiently catalyze the asymmetric epoxidation of unfunctionalized olefins with NaClO
series of chiral salen Mn(III) polymers with build-in phase transfer capability was prepared by bridging the chiral salen Mn(III) units with polyethylene glycol (PEG)-based di-imidazolium ionic liquid (IL) side by side. Technologies of characterization suggested the alternation of intact chiral salen Mn(III) unit with PEG-based dicationic imidazolium IL moiety in the rigid one-dimension polymers. Amphipathic
the asymmetric oxidation of methylphenyl sulfide, methyl p-methoxyphenyl sulfide, and methyl o-methoxyphenyl sulfide were performed in water. The catalytic efficiency was significantly higher than that over neat complex (yields, 10–16% and ee values, 77–79%). More attractively, the phase transfer catalysts could be facilely recovered by solvent precipitation for efficient reuse.
通过将双手性Salen Ti IV单元与各种基于聚乙二醇(PEG)的阳离子型离子液体(IL)接头共价桥接,制备了一系列具有固有相转移能力的协作手性Salen Ti IV催化剂。表征结果表明催化剂中存在基于聚醚的IL间隔基和完整的活性位点。以聚醚为基础的离子型IL间隔基不仅增强了分子内的协同反应途径,有利于不对称的硫氧化,而且使双金属催化剂具有内置的相转移能力。当甲基苯硫醚,甲基苯酚的不对称氧化反应在45分钟内,具有高ee值(在85-91%范围内)的手性亚砜的高产率(74-90%范围内)对甲氧基苯基硫化物和甲基邻甲氧基苯基硫化物在水中进行。催化效率显着高于纯配合物(产率为10–16%,ee值为77–79%)。更有吸引力的是,相转移催化剂可以通过溶剂沉淀容易地回收,以有效地再利用。
Reaction products of guanidine compounds or salts thereof, polyepoxides and polyhalogens
申请人:Rohm and Haas Electronic Materials LLC
公开号:EP2886538A1
公开(公告)日:2015-06-24
Reaction products of guanidine compounds or salts thereof, polyepoxide compounds and polyhalogen compounds may be used as levelers in metal electroplating baths, such as copper electroplating baths, to provide good throwing power. Such reaction products may plate with good surface properties of the metal deposits and good physical reliability.