and the optimum conditions were obtained as follows: the yield was as high as 98.4% when benzoin was 10 mmol,2% copper acetate 4mL,ammonium nitrate 10 mmol,glacialacetic acid 14 mL,and the mixture was then refluxed.If 1 g FeCl3·6H2O was added,the reaction time was reduced from 90 min...
The structures of the compounds cited are shown in Fig. 11.1. C = concentration obtained (production); SQ = small quantities. 11.2.1 Esters Ethyl acetate is a fruity smelling liquid with a brandy note and is the most common ester in fruits (Bauer et al. 2001). This ester, for example...
ChemInform Abstract: Carbon-Carbon Bond Cleavage of α-Hydroxybenzylheteroarenes Catalyzed by Cyanide Ion: Retro-Benzoin Condensation Affords Ketones and H... ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To acce...
ChemInform Abstract: One-Pot Synthesis of 2,4,5-Trisubstituted Imidazoles Using MoO3/SiO2, an Efficient and Recyclable Catalyst One-pot, three-component condensation of benzil/benzoin, substituted aromatic aldehydes, and ammonium acetate in an ethanol–water (1:1, v=v) solvent syste... SV Bhosa...
2-Aryl-4,5-diphenyl-1H-imidazoles were synthesized from benzil or benzoin, ammonium acetate, and aromatic aldehydes. The advantages of this method are the use of an inexpensive and readily available catalyst, easy workup, and improved yields, and the use of an ethanol-water solvent that is ...
Benzoin (0.5 mmol, 106 mg) and Er0.01Yb0.2CaMoO4(10 mg) were combined and heated to 120 °C in 1 mL of toluene while being continuously stirred with a magnetic stir bar for 30 min, or until the reaction was completed (as determined by TLC). After allowing the reaction liquid to sett...
Pleasingly, phenylacetate ester-derived cyclopropane 14 was produced in comparable selectivity to 9, confirming that α-alkyl esters are tolerated by [Au(6)(Cl)] and suggesting that the steric bulk of the pivolyl moiety is responsible for the loss of stereoselectivity in the case of 13. ...
Following the successful preparation of nanoparticles, the catalysts were utilized in Knoevenagel and benzoin condensations. Fe2O3-MgO@Ch.F. exhibited exceptional activity in Knoevenagel condensation under solvent-free conditions at room temperature, achieving high yields (91–98%) in a short time...
The quality of the chemical synthesized 2-PE is reduced greatly because of its harsh conditions and the toxic reagents. 2-PE naturally exists in rose flower, and a number of fungi are known as 2-PE producers including Phellinus ignarius, Ischnoderma benzoinum, Geotrichum penicillatum, ...
1-Hydroxy-2-phenylindole is easily prepared by an acid-catalyzed cyclodehydration of benzoin oxime (equation 193) 〈1895CB585〉. In addition to the reductive cyclization included in Table 11, 1-hydroxyindole-2-carboxylate can also be prepared by base-catalyzed cyclization of dimethyl o-nitro...