Current Microwave Chemistry - Volume 2, Issue 1, 2015

Aqueous CdS:Cu nanocrystals (NCs) have been successfully prepared under microwave irradiation conditions. It appears that these nanocrystals contain abundant copper ions in their central interior, and they can diffuse through the interface of CuS nucleus and CdS coated layers via cation exchange processes. The crystal structure, shapes and optical properties of nanocrystals were determined by X-ray diffraction, high-res Read More

Under microwave irradiation, we systematically studied the formation of transition metal ions (TM), Ag+, Mn2+, Cu2+, Fe2+, Co2+ and Ni2+, doped CdS semiconductor nanocrystals in a pure water solution. The center-doping strategy is essential for achieving efficient internal-doping to improve the optical properties and stability of doped nanocrystals. The resulting TM doped nanocrystals have a high photoluminescence Read More

A convenient diversity oriented synthetic procedure for the construction of various oxo-xanthenes such as 12- aryl-8,9,10,12-tetrahydrobenzo[a]-xanthene-11-ones, 9-aryl-3,4,5,6,7,9-hexahydro-1H-xanthene-1,8(2H)-diones and 9- substituted-2,3,4,9-tetrahydro-1H-xanthen-1-ones has been developed by using p-dodecylbenzenesulfonic acid as an efficient Brønsted acid catalyst under solvent-free microwave conditions. The p Read More

A method to obtain vanilla extracts with 1 fold of concentration from cured vanilla pods using a conventional microwaves oven is proposed. With this method it was possible to obtain vanilla extracts containing 0.20% of vanillin, in only three days. This value is higher than that established as minimum value by international norms (0.11%) for extracts of vanilla. In this study, irradiation time, no-irradiation time, power and volu Read More

2-(2-Chlorobenzyl)-1H-benzimidazole (2) was prepared from the reaction of o-phenylenediamine and ethylimido- o-chlorophenylacetate hydrochloride (1) under microwave irradiation. The acetate and hydrazide derivatives of 2- (2-chlorobenzyl)-1H-benzimidazole (2) were synthesized respectively. Then, 2-[2-(2-chlorobenzyl)-1H-benzimidazol-1- yl]-N-(2,5-dioxopyrrolidin-1-yl)acetamide (5), 5-{[2-(2-chlorobenzyl)-1H-ben Read More

Metal oxide-based semiconductor photocatalysis has attracted much attention in recent years. In the cutting edge of efficient photocatalysis, various synthetic and modification strategies of oxides on the nanometer scale have evolved for surface tuning properties. Thus, it is interesting to study recent progresses in the development of surface tuned metal oxide-based nanomaterials as efficient photocatalysts. In this work, Read More

A reliable, green and energy-efficient synthesis of a series of 1-(6,7-dimethoxy-3,4-dihydroisoquinolin-2(1H)- yl)-2-(phenylamino)ethanone is reported. The reaction conditions were optimized using the conventional and microwave synthetic approaches. The un-precedented displacement of the chloro group of 2-chloro-1-(6,7-dimethoxy-3,4- dihydroisoquinolin-2(1H)-yl)ethanone with substituted anilines under microwave so Read More

A comparative study on the transesterification of natural oils obtained from Calophyllum inophyllum seeds was carried out using homogeneous (NaOH/MeOH) or heterogeneous catalysts, with conventional heating and under microwave irradiation. The results show that the microwave-assisted reaction using heterogeneous catalysts, obtained from renewable sources (rice husk and egg shell ashes), constitutes an energ Read More

An exceptionally efficient, environmentally safe and economic method has been developed for regioselective α-bromination of various aralkyl ketones in excellent yield with N-bromosuccinimide (NBS) under microwave irradiation (CEM discover) without use of either a solvent or a catalyst. After completion of the reaction, the NBS can be regenerated by using an environment friendly brominating agent NaBr/NaBrO3 in aceti Read More

Novel water soluble γ-phosphonates and phosphonic acid quaternary ammonium compounds (QAC) with different alkyl chain lengths, a dansyl (DNS) fluorescent tag ([RN+Me2(CH2)3P(O)(OR1)2]Br-; R = CH3, C18H37, -DNS-NH- (CH2)3; R1 = Et, iPr, or H) or pyridinium ([C5H5N+(CH2)3P(O)(OR1)]Br-; R1 = iPr, or H) were synthesized in two or three steps (Arbuzov, Menshutkin and bis-dealkylation reactions) under MW conditio Read More

This work reports the synthesis of several 3-methoxycarbonyl-γ-butyrolactone derivatives (4-12) starting from dimethyl itaconate (1), an aryl bromide (2), and a carbonyl compound (3). The synthetic protocol used microwave irradiation, argon atmosphere, and acetonitrile as solvent. The synthesis furnished the target compounds in 80-96% yield; reactions lasted about 10-20 min.