Investigations on chemosynthesized CdSe microclusters

5-Chloropyrazole-4-carboxaldehydes as synthon in heterocyclic synthesis

“…El-atif et al [59] and Pawar [46] studied the reactivity of 4 with hydroxyl amine in pyridine, and they separate the oxazole derivative 124, whereas Holzer et al [58] reported that compound 4 reacted with hydroxylamine hydrochloride in ethanol to give the corresponding oxime 94, which does not undergo cyclization in either refluxing pyridine or sodium hydride to the corresponding pyrazolo [4,3-d]oxazole 124 (Scheme 27) [60].…”

“…The following are some of the methods that have been used to prepare 5-chloro-3-methyl-1-phenyl-1H-pyrazole-4-carbaldehyde (4). First, treatment of a solution of 1H-pyrazol-5(4H)-one (3) in DMF at 0°C with POCl 3 followed by heating the reaction mixture in a water bath [path B] afforded 4 [19,20]. Vilsmeier-Haack reaction of chloropyrazole 5 afforded 4 [21,22].…”

Semiconductor-septum solar rechargeable storage cells

“…The recent awakening to the urgency for cleansing the polluted environment and the avoidance of further pollution (i.e., global warming), as evident during the environmental climate change conference (December, [6][7][8][9][10][11][12][13][14][15][16][17][18]2009 at Copenhagen), has rekindled interest in clean, nonpolluting and renewable energy sources for generating the two most commercial forms of energy, i.e., electricity and fuel. Because of the depleting, dirty (pollution) and dangerous characteristics of fossil and nuclear fuels, which presently form the base for the commercial energies, there is an ongoing search for clean and renewable energies.…”

Synthesis of 1H-pyrazolo[1,2-b]phthalazine-5,10-dione derivatives: assessment of their antimicrobial, antituberculosis and antioxidant activity

“…The required starting material, 1-aryl-5-chloro-3-methyl-1H-pyrazole-4-carbaldehyde was prepared by using the procedure in the literature [26]. 1-Aryl-5-chloro-3-methyl-1H-pyrazole-4-carbaldehyde undergoes a nucleophilic substitution reaction with respective phenol at refluxing temperature for 4 h in the presence of a basic catalyst (K2CO3) in DMF which resulted in the required 3-methyl-5-aryloxy-1-aryl-1H-pyrazole-4-carbaldehyde [22,23].…”