undivided cell, of Ph3P in the presence of a carboxylic acid in CH2Cl2 containing 2,6-lutidinium perchlorate as the supporting electrolyte was shown to generate the corresponding acyloxyphosphonium ion, Ph3P+-OCOR, which was converted in situ to esters, amides, and β-lactams under mild conditions.
结果表明,在羧酸存在下的CH 2 Cl 2中,含高氯酸2,6-lut啶鎓作为辅助电解质的PH 3 P在不分隔的电池中恒流电解会生成相应的酰氧基phosph离子Ph 3 P + -OCOR,在温和条件下原位转化为酯,酰胺和β-内酰胺。
The Reactivities of Nuclear-Substituted Phenyl Methacrylates in Radical Copolymerization with Styrene
reactivities of methacrylate monomers toward the attack of a radical, the copolymerizations of a series of nuclear-substituted phenyl methacrylates with styrene were investigated. From the results, the monomer reactivity ratios and the Alfrey-Price Q, and e values were determined. It was found that the relative reactivities toward the polystyryl radical were not correlated with the ordinary Hammett equation
为了阐明烷基取代基对甲基丙烯酸酯单体对自由基攻击的反应性的影响,研究了一系列核取代的甲基丙烯酸苯酯与苯乙烯的共聚反应。根据结果,确定了单体反应性比率和 Alfrey-Price Q 和 e 值。发现对聚苯乙烯基团的相对反应性与普通的哈米特方程无关,但通过包含取代基共振贡献项的修正哈米特方程获得了线性关系。因此,认为取代的甲基丙烯酸苯酯的反应性取决于由取代基引起的极性和共振效应。
Pyranonaphthoquinone antibiotics. Part 1. Syntheses of 9-demethoxyeleutherins and 9-deoxynanaomycin A methyl ester
作者:Tadashi Kometani、Eiichi Yoshii
DOI:10.1039/p19810001191
日期:——
The syntheses of 9-demethoxyeleutherins and 9-deoxynanaomycin A methylester starting from indan-1-one derivatives are described. Lemieux–Johnson oxidation of the indene (15) derived from 4,7-dimethoxy-2-methyl-indan-1-one (14) afforded the diketone (16). The diol (17) obtained by lithium aluminium hydride reduction of (16) was treated with hydrochloric acid to give a ca. 1 : 2 mixture of cis-5,8-dimethoxy-1
Polymers for antifouling coatings and a process for the preparation thereof
申请人:Jotun A/S
公开号:US20030225230A1
公开(公告)日:2003-12-04
Polymer for antifouling coatings which comprises units corresponding to the following monomers: A) 5 to 100 mol. % of one or more compounds of general formula (I) in which R=H or CH
3
; X=O or S; R
1
=Ph(R
2
)
m
, —C(H)
3−(p+q)
(CO—R)
3
p
(COOR
3
)
q
, —(CH
2
)
n
−(CO)
t
—COOR
3
or optionally substituted thiadiazolyl and thiazolylsulfamyl groups; Ph=phenyl; m=1-3; p=0-3; q=0-3; p+q=1-3; s=0 or 1; t=0 or 1; R
2
=each independently selected from halogen, —C(O)H, —COOR
3
, —CH
2
—COOR
3
, —O—R
3
, —NH COOR
3
, —NH—CO—R
3
and —NH
2
; R
3
=II or optionally halogen substituted alkyl, aryl, cycloalkyl, aralkyl groups with 1-10 C atoms; and B) 0 to 95 mol. % of one or more other ethylenically unsaturated compound. Processes for preparing the polymers defined above, points containing said polymers, and the use of monomers of the above formula (I) for preparing for antifouling coatings.
1
An efficient radical synthesis of sulfurated oxindoles is developed using CoBr2 as both an initiator and a promoter. By controlling the CoBr2/(NH4)2S2O8 ratio, a wide range of sulfurated and brominated/sulfurated oxindoles are selectively prepared.