Chiral recognition with a benzofuran receptor that mimics an oxyanion hole
A new chiral benzofuran receptor has been synthesized and its properties in the association of amino acid derivatives have been studied. X-ray structures were obtained and these corroborate the presence of an oxyanion-hole motif in these structures.
Fuentes De Arriba, ngel L.,Herrero, ngel Gmez,Rubio, Omayra H.,Monlen, Laura M.,Simn Rubio, Luis,Alczar, Victoria,Sanz, Francisca,Morn, Joaqun R.
supporting information
p. 493 - 501
(2015/02/19)
Rhodium-catalyzed synthesis of isothiocyanate from isonitrile and sulfur
Rhodium complexes RhH(PPh3)4 and Rh(acac)(CH 2CH2)2 catalyze sulfuration of isonitrile with sulfur giving isothiocyanates in high yields. The metal-catalyzed reaction is rapid in refluxing acetone, and completes within 3 h in most cases. The reaction exhibits induction period, which disappeared by preheating sulfur in refluxing acetone for 1.5 h. Use of several organic polysulfides in this transformation was examined in order to compare the reactivity.
Direct synthesis of isothiocyanates from isonitriles by molybdenum-catalyzed sulfur transfer with elemental sulfur
The direct molybdenum-catalyzed sulfuration of a variety of isonitriles with elemental sulfur or propene sulfide as sulfur donors affords the corresponding isothiocyanates in good yields and under mild reaction conditions. A catalytic cycle is suggested, in which the molybdenum oxo disulfur complex operates as the active sulfur-transferring species. A novel adduct between the isonitrile and the molybdenum complex has been characterized by X-ray analysis and its association constant determined by UV-vis spectroscopy, but this adduct appears not to be involved in the sulfur-transfer process.
Adam, Waldemar,Bargon, Rainer M.,Bosio, Sara G.,Schenk, Wolfdieter A.,Stalke, Dietmar
p. 7037 - 7041
(2007/10/03)
Sulfonylthiosemicarbazides, metal complexes thereof, and solutions containing such compounds for use in extraction of metal values
Certain sulfonylthiosemicarbazides, metal complexes thereof and solutions of said compounds in essentially water-immiscible, liquid hydrocarbon solvents are disclosed. The sulfonylthiosemicarbazides have the general structural formula: STR1 wherein R and R1 are as defined in the specification and claims hereof. Particular metal values are recovered from their aqueous solutions by using sulfonylthiosemicarbazides dissolved in essentially water-immiscible, liquid hydrocarbon solvents. The extraction process involves contacting the metal value containing aqueous solution with the solution of the sulfonylthiosemicarbazide in essentially water-immiscible, liquid hydrocarbon solvent and stripping the metal from the loaded organic phase.
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(2008/06/13)
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