- Palladium-catalyzed heck reaction of aryl chlorides under mild conditions promoted by organic ionic bases
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An efficient Pd-catalyzed Heck reaction of aryl chlorides with olefins under mild conditions is described. High yields of products were achieved with n-Bu4N+OAc- as base. Significantly, the temperature of the Heck reaction of diverse nonactivated aryl chlorides can be lowered to 80 °C. The new reaction system can also tolerate a wider range of olefins.
- Xu, Hua-Jian,Zhao, Yong-Qiang,Zhou, Xin-Feng
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experimental part
p. 8036 - 8041
(2011/12/02)
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- Encapsulated binding sites - Synthetically simple receptors for the binding and transport of HCl
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We report a receptor with an encapsulated amine/amide binding site, which binds HCl with high affinity in organic media - the rate of HCl transport through an apolar phase is controlled by the degree of encapsulation of the HCl binding site.
- Winstanley, Keith J.,Allen, Sarah J.,Smith, David K.
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scheme or table
p. 4299 - 4301
(2011/03/19)
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- Effect of spacer geometry on oxoanion binding by bis- and tetrakis-thiourea hosts
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Hosts with thiourea groups bind anions by formation of multiple hydrogen bonds. This contribution discusses how spacers linking two or four thiourea groups affect the host affinity and selectivity. While most of the bis-thioureas bind H2PO4- preferentially, the extent of selectivity over chloride, acetate, and H2AsO4- is determined by the size of the binding cavity. A tetrakis-thiourea is shown to exhibit a unique H2AsO4- selectivity, and the discrimination of chloride is enhanced by specific solvation in dimethyl sulfoxide.
- Leung, Annie N.,Degenhardt, Dave A.,Bühlmann, Philippe
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p. 2530 - 2536
(2008/09/18)
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- Kinetics and mechanism of phosphate-catalyzed hydrolysis of benzoate esters: Comparison with nucleophilic catalysis by imidazole and o-iodosobenzoate
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Phosphate-catalyzed hydrolysis of 2,4-dinitrophenyl 4-X-benzoate, and 3- or 4-Y-phenyl 3,5-dinitrobenzoates, where X and Y are substituents, has been studied spectrophotometrically. The following conclusions are based on catalytic rate constants, solvent
- El Seoud, Omar A.,Ruasse, Marie-Francoise,Rodrigues, Wagner A.
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p. 1053 - 1058
(2007/10/03)
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- A novel phosphate chemosensor utilizing anion-induced fluorescence change
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(figure presented) The neutral receptor N,N′-bis{3,5-di[(1-pyrenylmethyl)carbamoyl]benzyl} pyridine-2,6-dicarbamide (2) provides a pseudo-tetrahedron cleft and multiple hydrogen bondings to form a 1:1 complex with phosphate ion in a highly selective manne
- Liao, Jen-Hai,Chen, Chao-Tsen,Fang, Jim-Min
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p. 561 - 564
(2007/10/03)
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- An azophenol-based chromogenic anion sensor
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(equation presented) A new chromogenic azophenol-thiourea based anion sensor, 2, has been developed. This system allows for the selective colorimetric detection of F-, H2PO4-, and AcO-. Selectivity trends turned out to be dependent upon guest basicity and conformational complementarity between 2 and the guest.
- Lee, Dong Hoon,Lee, Kwan Hee,Hong, Jong-In
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- UNE METHODE SIMPLE DE SYNTHESE DES PHOSPHATES TERPENIQUES ALLYLIQUES PRIMAIRES ET TERTIAIRES.
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Alkylation of tetrabutylammonium dihydrogenophosphate by terpenic allylic sulphonium salts give the corresponding primary terpenic allylic phosphates in fair to moderate yields, without complex procedures of purification.The catalysis of the reaction by cuprous ion leads to the isolation of tertiary allylic phosphates.
- Julia, M,Mestdagh, H.,Rolando, C.
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p. 3841 - 3850
(2007/10/02)
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