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Polyphosphazenes as Biomaterials
Published in Severian Dumitriu, Valentin Popa, Polymeric Biomaterials, 2020
Meng Deng, Cato T. Laurencin, Harry R. Allcock, Sangamesh G. Kumbar
The reaction mechanism of living cationic polymerization has been reported (Honeyman et al. 1995; Allcock et al. 1996, 1997a, b; Nelson and Allcock 1997; Allcock 2003). This polymerization involves the addition of a cationic initiator, such as phosphorus pentachloride (PCl5), to the monomer 4. The initiator causes the displacement of the trimethylsilyl group. This creates an active site where polymer chain growth occurs with the addition of more monomers. The chain keeps growing until all the monomers are used and the reaction is terminated with the addition of a terminator.
Synthesis of novel adamantane-containing dihydropyrimidines utilizing Biginelli condensation reaction
Published in Journal of Sulfur Chemistry, 2023
Mina Abkar Aras, Adeleh Moshtaghi Zonouz
On the other hand, the incorporation of the adamantyl moiety into the known pharmacologically active molecules resulted in many cases improving their pharmacological properties without enhancement of toxicity. Hence, we are interested in preparing adamantane-containing Biginelli products. Synthesis of C-5 and C-6 adamantylated pyrimidines have been previously reported. C-5 Adamantylated pyrimidines have been synthesized through adamantylation of aminopyrimidine, barbituric acid, and thiobarbituric acid in boiling trifluoroacetic acid [41], and C-6 adamantylated pyrimidine derivatives have been prepared based on the Traube reaction of 3-(adamantan-1-yl)−3-oxopropionic acid ethyl ester with urea, thiourea, guanidine, and acetamidine, respectively [42]. Despite these findings, to the best of our knowledge, due to the sensitivity of the Bigenelli reaction to the sterically hindered reagents, there is only one report in which adamantane-containing active methylene compounds have been used in the Biginelli reaction. Lashmanova et al. have been obtained adamantylated Biginelli products with the poor yields of 6-35% using trimethylsilyl chloride promoted Biginelli reaction of adamantane 3-oxonitrile and adamantane 1,3-dicarbonyl compounds, as active methylene compounds, aromatic aldehydes, and thiourea [43].
Solution-processed sky-blue phosphorescent organic light-emitting diodes based on 2-(5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene-8-yl)-4-(trimethylsilyl)pyridine chelated iridium complex
Published in Journal of Information Display, 2022
Yeong Heon Jeong, Chul Woong Joo, Hyein Jeong, Jonghee Lee, Yun-Hi Kim
In this study, a new 2-(5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene-8-yl)−4-(trimethylsilyl)pyridine-based iridium complex, (BOPySi)2IrPic, was designed and synthesized for high-efficiency solution-processed sky-blue phosphorescent OLEDs (PhOLEDs). To lower the HOMO energy level, the 2-(5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene-8-yl) group was introduced instead of the phenyl part with general electron acceptor groups. Furthermore, the introduction of the trimethylsilyl group has led to the increase in the bandgap and horizontal dipole orientation. It is also advantageous for easily dissolving the synthesized dopant in common organic solvents because of the trimethylsilyl functional group in the boron containing ligand. The solution-processed sky-blue PhOLEDs with a (BOPySi)2IrPic emitter-doped emissive layer (EML) exhibited a peak external quantum efficiency (EQE) of 8.93% with a current efficiency (CE) of 23.56 cd/A.
Responses of oil degrader enzyme activities, metabolism and degradation kinetics to bean root exudates during rhizoremediation of crude oil contaminated soil
Published in International Journal of Phytoremediation, 2022
Kwang Mo Yang, Toemthip Poolpak, Prayad Pokethitiyook, Maleeya Kruatrachue, Patompong Saengwilai
All chemicals in TPH analysis (analytical reagents and gas chromatography solvents grade) were purchased from J.T Baker (Center Valley, PA). The 16-PAHs standard, the priority pollutant polycyclic aromatic hydrocarbons in acetonitrile SRM® 1647f, was purchased from the National Institute of Standards & Technology (NIST, Gaithersburg, MD). N-methyl-N-(trimethylsilyl) trifluoroacetamide (MSTFA) was purchased from Macherey-Nagel (Düren, Germany) and methoxamine hydrochloride (MOX) reagent was purchased from Thermofisher-Scientific (Bellefonte, PA). Tapis crude oil was obtained from Esso Standard Co., Ltd., (Thailand). Distilled and deionized water were processed through a Milli-Q water system (Millipore, Bedford, MA) before use.