d-Acetamidocinnamamide do not react with P(OMe)_3, with P(NEt_2)_3 they give rise to 2-methyl-4-hydroxy-5-d-[bis(diethylamino)phosphoryl] benzyl imidazole.The pathway is studied for the formation of Ⅰ. The two interm...d-Acetamidocinnamamide do not react with P(OMe)_3, with P(NEt_2)_3 they give rise to 2-methyl-4-hydroxy-5-d-[bis(diethylamino)phosphoryl] benzyl imidazole.The pathway is studied for the formation of Ⅰ. The two intermediates(Ⅱ) are isolated.The structures of Ⅰ and Ⅱ are confirmed by IR, ~1H NMR, ^(31)P NMR, Ms.展开更多
A highly efficient and regio-/stereoselective method of hydrosilylating terminal alkynes was developed using Pt(DVDS)-tri(t-butyl) phosphine catalyst system at room temperature.Trans-products or alpha-products were ob...A highly efficient and regio-/stereoselective method of hydrosilylating terminal alkynes was developed using Pt(DVDS)-tri(t-butyl) phosphine catalyst system at room temperature.Trans-products or alpha-products were obtained almost exclusively depending on the alkynes and silanes employed.展开更多
Ⅰ. INTRODUCTION Tris(hydroxymethyl)aminomethane (THAM or tris) is a versatile reagent in chemistry, biochemistry and medical science. Hence, its purification becomes important. Generally, tris is purified by recrysta...Ⅰ. INTRODUCTION Tris(hydroxymethyl)aminomethane (THAM or tris) is a versatile reagent in chemistry, biochemistry and medical science. Hence, its purification becomes important. Generally, tris is purified by recrystallisation. Koch et al. tried to sublime it at atmospheric pressure and under nitrogen current, but without success. We succeeded in purifying the compound using vacuum sublimation, which possesses the advantages of (ⅰ) simplicity in operation, and (ⅱ) no contamination can be introduced during the process. The purity of the product obtained is better than 99.9%.展开更多
文摘d-Acetamidocinnamamide do not react with P(OMe)_3, with P(NEt_2)_3 they give rise to 2-methyl-4-hydroxy-5-d-[bis(diethylamino)phosphoryl] benzyl imidazole.The pathway is studied for the formation of Ⅰ. The two intermediates(Ⅱ) are isolated.The structures of Ⅰ and Ⅱ are confirmed by IR, ~1H NMR, ^(31)P NMR, Ms.
文摘A highly efficient and regio-/stereoselective method of hydrosilylating terminal alkynes was developed using Pt(DVDS)-tri(t-butyl) phosphine catalyst system at room temperature.Trans-products or alpha-products were obtained almost exclusively depending on the alkynes and silanes employed.
文摘Ⅰ. INTRODUCTION Tris(hydroxymethyl)aminomethane (THAM or tris) is a versatile reagent in chemistry, biochemistry and medical science. Hence, its purification becomes important. Generally, tris is purified by recrystallisation. Koch et al. tried to sublime it at atmospheric pressure and under nitrogen current, but without success. We succeeded in purifying the compound using vacuum sublimation, which possesses the advantages of (ⅰ) simplicity in operation, and (ⅱ) no contamination can be introduced during the process. The purity of the product obtained is better than 99.9%.
