The effect of substitution of [Pd(PPh 3 ) 4 ], which is unstable in air, by complexes of the type½MCl 2 L 2 ðM ¼ Pd; Pt; L ¼ AsPh 3 ; SbPh 3 Þ; ½PdL 4 ðL ¼ PPh 3 ; AsPh 3 ; SbPh 3 Þ and [NiX 2 (PPh 3 ) 2 ] on the syntheses of thioethers, acetylenes and ketones is described.

No abstract

No abstract

Síntese e caracterização de um novo composto obtido pela reação... 467Ciênc. agrotec., Lavras, v. 30, n. 3, p. 467-473, maio/jun., 2006 SÍNTESE E CARACTERIZAÇÃO DE UM NOVO COMPOSTO OBTIDO PELA REAÇÃO ENTRE HIDRETO DE TRIFENILESTANHO E ÁCIDO (±)-MANDÉLICO ABSTRACTThe present paper refers to the synthesis and characterization of a new organotin compound that was obtained by reaction of (±)-mandelic acid with triphenyltin hydride in acetonitrile medium under reflux. According to hydrogen and carbon elemental analysis, infrared spectroscopy and high resolution mass spectrometry the formula of such compounds is (C 6 H 5 ) 2 SnMand 2 {Mand = C 6 H 5 CH(OH)COO}. An octahedral complex, with the phenyl groups in trans position was proposed for its structure. It was observed that this compound was active against the fungus Fusarium oxysporum f. sp. cubense. The biocide effect was more intense than the one observed for (±)-mandelic acid. However, it was less efficient than tin chloride hydrate, triphenyltin acetate and triphenyltin hydride. In germination assays with conides and microconides of the same fungus in the presence of [(C 6 H 5 ) 2 SnMand 2 ], the germination rates were below 11%.

No abstract