Decabromodiphenyl ether

precautionary principle approach when it comes to evaluating how toxic a substance is (Withgott & Laposata, 2014, p. 382). This lack of precaution has proven to be dangerous when it comes to chemicals, especially when using polybrominated diphenyl ethers (PBDEs). PBDEs are chemically engineered flame retardants used during the manufacturing process of clothing, bedding, and many other household goods. These flame retardants work by eliminating the fire’s oxygen supply, resulting in less damage to

assortment of particles derived from differing sources which include trace metals and chemical congeners. In 2004 Polybrominated diphenyl ether (PBDEs) pentaBDE and octaBDE were banned by the European court of Justice. Although decaBDE is still used in the North American market in residential upholstered furniture and mattresses. (Chao, et. al. 2014) Polybrominated diphenyl ether (PBDEs) have been extensively used as flame retardants for highly flammable consumer goods throughout homes, cars and workplaces

A 1,3,4-thiadiazole library was constructed by solid-phase organic synthesis. The key step of this solid-phase synthesis involves the preparation of polymer-bound 2-amido-5-amino-1,3,4-thiadiazole resin by the cyclization of thiosemicarbazide resin using p-TsCl as the desulfurative agent, followed by the functionalization of resin by alkylation, acylation, alkylation/acylation, and Suzuki coupling reaction. Both the alkylation and acylation reactions chemoselectively occurred at the 2-amide position

Chapter Five Discussion Extraction is a process by which substances and active constituents are separated from the original matrix, extraction process depends on many physical and chemical characteristics. Extraction is divided into two types liquid phase extraction and solid phase extraction depending on the physical phase of extraction agent(Rezaee et al., 2006). In our study, we have adopted liquid phase extraction for several reasons. Firstly, simple, inexpensive, relatively precise and wide

0514 g | | | | | | | | | | | Percent Yield * | | | | | | Compound | Expected | Actual | % | | | 1-phenyl-3-buten-1-ol | 0.153 g | 0.0514 g | 33.60% | | | | | | | | | TLC | | | | | | solvent system: 30% ether-hexane | | | | | Compound | Rf Value | | | | | Benzaldehyde | 0.75 | | | | | 1-phenyl-3-buten-1-ol | 0.25 | | | | | | | | | | | * Please see calculation section Fig. 3 for further details. | | | | | | | | |

RESEARCH “Magic Mud” is mainly a mixture of a dusty substance known as “Cornstarch”, and a liquid known as “Tonic Water”. When you apply pressure to the substance of Magic Mud, it will act as if it were a solid. Once you stop applying pressure to it, the substance will act as if it were a liquid. To make this happen you should apparently mix tonic water and cornstarch for a long period of time to allow this chemical reaction to occur. What I wanted to know is if this would still be possible if

the purpose of this experiment is to prepare a Grignard reagent by reacting with alkyl or aryl halide and to ultimately react the Grignard reagent with carbon dioxide in order to produce carboxylate. The formed carboxylate is then protonated with an acid to produce carboxylic acid that could be used with liquid-liquid extraction to isolate the unknown acid from the other products from side reactions. The final unknown product is identified by measuring the melting point and calculating the molecular

aprotic solvents to minimize interactions with strong proton sources that may result in undesired products. Furthermore, the solvent chosen for the reaction must dissolve everything in solution. Commonly used solvents in Grignard reactions are diethyl ether and tetrahydrofuran (THF). They are preferred over hexane solvents due to the presence of an oxygen atom which contains a lone electron pair that attracts the partially positive magnesium metal, resulting in increased stability. As mentioned previously

theoretical yield. Diethyl ether solvent was used to keep away any water/moisture that could destroy the Grignard reagent and react to form a hydrocarbon instead of an alcohol. Therefore, experiment execution need a lot of precision and precautious to make sure that the apparatus used/reused as well as the reaction itself is dry and away from water or moisture. There

is a halogen. The balanced equation is shown below in Equation 1. 2RMgX  R2Mg + MgX2 Eq. 1 Grignard reagents form on the surface of metals. Most undergo reactions with ether (2). The reason that the Grignard synthesis is so valuable is due to the fact that it can form carbon-carbon bonds from carbon nucleophiles. Some of