DMSO 和 n—I~ NCI 同时加入, 表现出协同效应. 不饭能保持较 illi ~ 聚合反应活性, 而且产抽 分子量分布很窄(一丽√一 = 1 27) , 分子量随单体转化率增加而增加, 且残性关系良好, 聚合糟链 敷 只与引发 荆苇 农度相 关, 显示 活性 聚合 特关蕾词兰 蛭全 ·s0 / cb, DM 9 n 相分类号 聚...
The Soret effect (thermal diffusion) of dilute aqueous solutions of NH 4 Cl, Me 4 NCl, Et 4 NCl, n-Pr 4 NCl, and n-Bu 4 NCl has been investigated potentiometrically using the silver, silver chloride thermocell. The molar entropies (heats) of transport have been derived from the ...
I need some help distinguishing if the 4 species below are solvents, or catalists and if they are going to break apart and take part in the by-products of the reaction.used in a heck reaction : n-Bu4NCl used with a wittig reaction: KHMDS/THFused with Cl2CH2: iBu2AlH used with THF...
The Soret effect (thermal diffusion) of dilute aqueous solutions of NH 4 Cl, Me 4 NCl, Et 4 NCl, n-Pr 4 NCl, and n-Bu 4 NCl has been investigated potentiometrically using the silver, silver chloride thermocell. The molar entropies (heats) of transport have been derived from the initia...
The first example of living cationic isomerization polymerization of β-pinene was achieved with an initiating system that consists of the HCl−2-chloroethyl vinyl ether adduct [1a; CH3CH(OCH2CH2Cl)Cl] and isopropoxytitanium trichloride [TiCl3(OiPr)] in the presence of tetra-n-butylammonium c...
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活性阳离子聚合聚苯乙烯研究表明,SOCl2/SnCl4引发体系的苯乙烯聚合反应很快,但所得聚合产物的分子量分布宽(Mw/Mn=4.37),且其GPC曲线呈多重峰;单独加入季铵盐(n-Bu4NCl)或二甲基亚砜(DM SO)可使聚合产物分子量分布明显变窄,并随浓度的增加而加强,但程度有限,不显示活性聚合特征;DMSO和n-Bu4NCl同时加入,表现...
We report the development of a rapid approach for directly converting indoles into 2-oxindoles promoted by HOCl formed in situ from the combination of PIFA and n-Bu4NCl路H2O. The procedure is widely functional group tolerant and provides 2-oxindoles in up to 94% yield within 5 min. The ...