Synthesis of the Bis-Potassium Salts of 5-Hydroxy-3-oxopent-4-enoic Acids and Their Use for the Efficient Preparation of 4-Hydroxy-2H-pyran-2-ones and Other Heterocycles.
β Scribed by Dietmar Schmidt; Juergen Conrad; Iris Klaiber; Uwe Beifuss
- Publisher
- John Wiley and Sons
- Year
- 2007
- Weight
- 36 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0931-7597
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
## Abstract Polyaniline salts were prepared by doping polyaniline base with different Bronsted acids (sulfuric, nitric, phosphoric, perchloric, hydrochloric acid) and organic acids (__p__βtoluene sulfonic acid, 5βsulfosalicylic acid). Polyaniline complexes were also prepared using Lewis acids (alum
## Abstract All products are purified by recrystallization and subsequent drying in a desiccator under reduced pressure over phosphorous pentoxide.
## Abstract magnified image A simple and highly efficient procedure for the Biginelli condensation reaction of aldehydes, Ξ²βketoesters, urea, or thiourea catalyzed by Ceric ammonium nitrate (CAN) as a Lewisβacid at ambient temperature is described. The procedure proved to be simple and of high yiel