نتایج جستجو برای: 2 dioxo
تعداد نتایج: 2525681 فیلتر نتایج به سال:
SmCl3 (20 mol%) has been used as an efficient catalyst for reaction between aromatic aldehydes and 5,5-dimethyl-1,3-cyclohexanedione at 120°C to give 1,8-dioxo-octahydroxanthene derivatives in high yield. The same reaction in water, at room temperature gave only the open chain analogue of 1,8-dioxo-octahydroxanthene. Use of eco-friendly green Lewis acid, readily available catalyst and easy isol...
Under aprotic conditions, the reaction of 4-amino-1,2-naphthoquinone with excess S2Cl2 generates 4,5-dioxo-naphtho[1,2-d][1,2,3]dithiazol-2-ium chloride in a typical Herz condensation. By contrast, prior literature reports an imine (NH) product, 4,5-dioxo-1H-naphtho[1,2-d][1,2,3]dithiazole, for the same reaction performed in acetic acid. Herein, the cation product is isolated with four differen...
In the title salt, NH(4) (+)·C(4)H(3)N(2)O(2)S(-), the asymmetric unit comprises two half-occupied ammonium positions and a 4,6-dioxo-2-sulfanylidene-1,3-diazinan-5-ide anion. The anion shows C(2) as well as C(s) symmetry and is present in its diketonic tautomeric form. Intra-cyclic angles span a range from 116.64 (9)-124.67 (9)°. Inter-molecular N-H⋯O hydrogen bonds connect the cations and ani...
In the past few years multi component reactions have captured the attention of synthetic chemists as they provide easy access to diverse complex organic molecules through carbon - carbon and carbon - heteroatom bond formations in tandem manner with simple easy to carry out reaction conditions in short time. 1,8-dioxo-octahydroxanthene is a significant class of oxygen containing...
Two new diterpenes namely verbenacine (1) and salvinine (2) have been isolated from the aerial parts of Salvia verbenaca. Their structures have been elucidated on the basis of chemical and spectral data as 3alpha-hydroxy-19-carboxykaur-15-ene and 19-hydroxy-12,14-dioxo labda-15,17-diene.
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید