transformation of a wide variety of alcohols or carboxylic acids into the corresponding halides. Yields are high and conditions are very mild thus allowing for the presence of sensitive functional groups. The reagents can be easily tuned allowing therefore the selective monohalogenation of polyhydroxylated molecules. The scope and chemoselectivity of the reactions have been studied and reaction mechanisms
Directed Copper-Catalyzed Intermolecular Heck-Type Reaction of Unactivated Olefins and Alkyl Halides
作者:Chunlin Tang、Ran Zhang、Bo Zhu、Junkai Fu、Yi Deng、Li Tian、Wei Guan、Xihe Bi
DOI:10.1021/jacs.8b10874
日期:2018.12.12
A new type of intermolecular alkylative olefination of unactivated olefins and alkyl halides has been realized for the first time. This copper-promoted Heck-type reaction employs a directing-group strategy to efficiently produce the coupled alkyl olefin products with excellent regio- and stereoselectivity. A broad substrate scope including 1°, 2°, and 3° alkyl bromides and various nonactivated alkenes
Chloroacetylenes as Michael acceptors. 3. Mechanism and synthetic utility of enolate reactions with halogenated olefins and chloroacetylenes
作者:Andrew S. Kende、Pawel Fludzinski、John H. Hill
DOI:10.1021/ja00324a025
日期:1984.6
dimethyl-2,6 cyclohexene-2one) avec le trichloroethylene, d'autres ethylenes polyhalogenes et le perchlorobutadiene-1,3. Mecanisme. Lactonisation des adduits perchlorobutenyne. Condensation avec les chloroacetylenes
缩合 d'enolates(例如 l'enolate de Li de la dimethyl-2,6 cyclohexene-2one) avec le trichloroethylene, d'autres ethylenes polyhalogenes et le perchlorobutadiene-1,3。机制。全氯丁烯的内酯化作用。氯乙炔缩合
Transition metal compound, polymerization-initiator system comprising the same, and process for producing polymer
申请人:Uemura Makoto
公开号:US20070270521A1
公开(公告)日:2007-11-22
A transition metal compound represented by the formula, [(CpR
1
m
)(CO)
2
M
1
][M
2
(CO)
2
(CpR
2
n
)], wherein Cp is a cyclopentadienyl ring, R
1
and R
2
are independently of each other a hydrocarbyl group having 1 to 20 carbon atoms, and each of at least one R
1
and at least one R
2
is a hydrocarbyl group having 5 to 20 carbon atoms, m and n are independently of each other an integer of 1 to 5, and M
1
and M
2
are independently of each other a transition metal atom of the group 8 in the periodic table of elements; a polymerization-initiator system comprising said transition metal compound; and a process for producing a polymer in the presence of the polymerization-initiator system.
Synthesis, Herbicidal Activity, and QSAR of Novel <i>N</i>-Benzothiazolyl- pyrimidine-2,4-diones as Protoporphyrinogen Oxidase Inhibitors
作者:Yang Zuo、Qiongyou Wu、Sun-wen Su、Cong-wei Niu、Zhen Xi、Guang-Fu Yang
DOI:10.1021/acs.jafc.5b05378
日期:2016.1.27
μM) displayed the most promising postemergence herbicidal activity with a broadspectrum even at a concentration as low as 37.5 g of active ingredient (ai)/ha. Maize exhibits relative tolerance against compound 9F-6 at the dosage of 150 g ai/ha, but it is susceptible to saflufenacil even at 75 g ai/ha. Thus, compound 9F-6 exhibits the potential to be a newherbicide for weed control in maize fields
原卟啉原氧化酶(PPO,EC 1.3.3.4)是几种结构多样的除草剂的主要作用靶标。作为我们在开发新的抑制PPO的除草剂方面的研究工作的延续,一系列新型的3-(2'-卤代5'-取代-苯并噻唑-1'-基)-1-甲基-6-(三氟甲基) )设计并合成了嘧啶-2,4-二酮9。生物测定结果表明,许多新合成的化合物对烟草PPO(mtPPO)的抑制活性均高于对照,苯氟磺草胺和次磺隆。化合物9F-5被确定为最有效的抑制剂,对mtPPO的Ki值为0.0072μM,分别显示出比次磺隆(Ki = 0.03μM)和沙氟芬那西(Ki = 0.01μM)高约4.2倍和1.4倍的效力。另外的温室分析表明,化合物9F-6(Ki = 0.012μM)甚至在低至37.5 g活性成分(ai)/ ha的浓度下,仍显示出最有希望的出苗后除草活性,具有广谱性。玉米在150 g ai / ha的剂量下表现出对化合物9F-6的相对耐受性,但是即使在75