2404-89-9Relevant academic research and scientific papers
Anchored palladium bipyridyl complex in nanosized MCM-41: a recyclable and efficient catalyst for the Kumada-Corriu reaction
Tsai, Fu-Yu,Lin, Bo-Nan,Chen, Ming-Jie,Mou, Chung-Yuan,Liu, Shiuh-Tzung
, p. 4304 - 4309 (2007/10/03)
A palladium bipyridyl complex anchored onto nanosized mesoporous silica MCM-41 catalyzed the cross-coupling of aryl iodides or bromides with Grignard reagents to provide the corresponding biaryls in high yields. The reaction proceeded smoothly with an equal molar amount of substrate and Grignard reagent in the presence of 0.2-0.02 mol % of catalyst in THF at 50 °C or under refluxing conditions. The catalyst prepared may be used in a very low percentage, recovered after reaction, and re-used.
The thermal decomposition of 5-membered rings: A laser pyrolysis study
Hore, Nathan R.,Russell, Douglas K.
, p. 606 - 613 (2007/10/03)
The mechanisms of pyrolysis of cyclopentadiene, furan, pyrrole and thiophene have been investigated using a combination of IR laser powered homogeneous pyrolysis, chemical and physical trapping of radical intermediates, and use of precursors specifically designed to generate selected radical intermediates. The results confirm the central role played by free radicals in the cases of cyclopentadiene and thiophene, and the dominant step of 1,2-H shifts in the cases of furan and pyrrole. The experimental results may be interpreted according to the high level ab initio calculations recently reported in the literature.
Activation of Aromatic Carbon-Hydrogen Bonds by Palladium(II) Acetate-Dialkyl Sulfide Systems. Formation and Characterization of Novel Diphenyltripalladium(II) Complexes
Fuchita, Yoshio,Hiraki, Katsuma,Kamogawa, Yasuko,Suenaga, Miho,Tohgoh, Kazutaka,Fujiwara, Yuzo
, p. 1081 - 1085 (2007/10/02)
Palladium(II) acetate reacts wuth benzene in the presence of dialkyl sulfides at 70 deg C to afford novel diphenyltripalladium(II) complexes of 1SR2)PhPd(μ-MeCO2)2Pd(μ-MeCO2)2PdPh(R1SR2)> (1a; R1=But, R2=CH2But; 1b; R1=R2=But: 1c; R1=R2=Pri; 1d; R1=R2=Et) Adducts, tSCH2Bu')2> and i2)2>, prepared by the reactions of palladium(II) acetate and the corresponding dilakyl sulfides in benzene at 5-10 deg C, change to 1a and 1c, respectively, on heating in benzene at 70 deg C.In contrast, reactions of palladium(II) acetate with toluene or thiophene in the presence od diisopropyl sulfide afford no isolable tolyl- or thienyl-palladium species, but coupling products, i.e. bitolyls or bithienyls, are detected by GLC analysis.Treatment of 1b with styrene produces trans-stilbene, whereas 1c reacts with carbon monoxide as well as carbon dioxide to yield benzoic acid.When palladium(II) acetate and t-butyl phenethyl sulfide are heated at 80 deg C in benzene, an adduct tSCH2CH2Ph)2> is formed, in sharp contrast with the case of benzyl t-butyl sulfide, which gives a cyclopalladated complex under the same reaction conditions.
THERMAL HYDROTHIOLYSIS OF DI(2-THIENYL)SULFIDE IN THE GASEOUS AND LIQUID PHASE
Voronkov, M. G.,Deryagina, E. N.,Papernaya, L. K.,Sukhomazova, E. N.,Korchevin, N. A.,Efremova, G. G.
, p. 1301 - 1306 (2007/10/02)
At 500-600 deg C, di(2-thienyl)sulfide is converted to thiophene, thiophene thiols, dithienyls, and dithienothiophenes, and isomerized to 2,3-dithienylsulfide.Hydrogen sulfide accelerates these reactions significantly.In the liquid phase the thermal conversion of di(2-thienyl)sulfide takes place only with the participation of elemental sulfur or in the system sulfur-hydrogen sulfide.Thiophene and diethienothiophenes are not formed in this case, while isomerization occurs to a large degree.The observed thermal conversions of di(2-thienyl)sulfide are based on the addition of thiyl radicals to the double bonds of the thiophene ring and to the sulfide sulfur atom.
