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Showing 1 to 20 of 658 for “"2+2"”.
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The preparation of heterocycles by [2+2+2] cyclization and inverse electron demand Dels-Alder reactions of arynes with 1,2,4-triazines
Transition metal mediated [2 + 2 + 2] cyclizations have been well researched over the past several years. As a well-developed methodology, [2 + 2 + 2] chemistry has been employed as a major pathway to various carbo- and heterocyclic synthetic targets. Numerous transition metals have been applied as …
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Exploration of [2+2+2] cyclotrimerisation reactions of alkynes. A new methodology for the synthesis of small molecules to probe biological systems
The generation of new chemical entities (NCEs) for use in chemical biology and drug discovery is of wide interest to both academia and the pharmaceutical industry. In order to generate NCEs, this project focused on development of new synthetic methodologies using transition-metal mediated [2+2+2] …
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Exploration of [2+2+2] cyclotrimerisation reactions of alkynes. A new methodology for the synthesis of small molecules to probe biological systems
The generation of new chemical entities (NCEs) for use in chemical biology and drug discovery is of wide interest to both academia and the pharmaceutical industry. In order to generate NCEs, this project focused on development of new synthetic methodologies using transition-metal mediated [2+2+2] …
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Exploration of [2+2+2] cyclotrimerisation reactions of alkynes. A new methodology for the synthesis of small molecules to probe biological systems
The generation of new chemical entities (NCEs) for use in chemical biology and drug discovery is of wide interest to both academia and the pharmaceutical industry. In order to generate NCEs, this project focused on development of new synthetic methodologies using transition-metal mediated [2+2+2] …
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Advancing Nontoxic, Antimony-based 1–2–2-type Thermoelectric Zintls
We contributed to the advances of nontoxic, antimony-based 1–2–2-type Zintl thermoelectric materials from three aspects. Firstly, p-type CaMg2Sb2 has not been favorably considered a promising thermoelectric material in comparison to other Zintl phases. However, a series of meticulously designed …
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A Characterization of the Chevalley Groups G(,2)(2('n))
Made available in DSpace on 2014-12-09T22:17:44Z (GMT). No. of bitstreams: 1 6812206.pdf: 2187028 bytes, checksum: 7c9b2b09045c636478f917bffc6f5351 (MD5) Previous issue date: 1968
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2-acilaminoacritlatos en cicloadiciones [2+2]: síntesis de alfa, beta-C4Ser
Se ha optimizado la reacción de cicloadición [2+2] en ausencia de ácidos de Lewis entre 2-acetamidoacrilato de metilo y 1,1-dietoxietileno. A partir del producto obtenido de la reacción de cicloadición, tras una serie de transformaciones, se han obtenido diversas (1R*, 2R*)-c4Ser protegidas. …
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The Presence of the Covenant Motif in Amos 1:2-2:16
<p>The presence and use of the OT covenant(s) in the book of Amos has been a highly debated issue for the last century among OT scholars. The dissertation attempts to address this issue through an exegetical study of the "Oracles Against the Nations" of Amos 1:2-2:16. This pericope of Amos was …
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Synthesis of 3-aminocyclobutenones via [2 + 2] cycloaddition of ynamides and ketenes
Ynamides react with various classes of ketenes in intermolecular [2 + 2] cycloaddition to afford substituted cyclobutenones with complete regioselectivity. The cycloaddition substrates are easily assembled from amine derivatives by copper-catalyzed N-alkynylation with acetylenic bromides. The …
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Preparation and Chelation Studies of 2-(2'-Ethoxyethoxy) Ethyl-2, 3-Diaminopropyl Ether
No abstract prepared.
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AN ANALYSIS OF PERSISTENCE FACTORS OF 2+2 UNIVERSITY CENTER TEACHER EDUCATION STUDENTS
The issue of teacher shortages across the state and nation, especially in rural areas, is a complex one. The disparity between the number of teachers produced and what is needed to fill classrooms across the nation in states where student populations are growing is exacerbated by issues of …
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Synthesis of 3-Aryl-2-(2-aryl-2-oxoethyl)pyrido[2,3-d]-4(3H)pyrimidones and 3-Aryl-2-(2-arylethenyl)pyrido[2,3-d]-4(3H)pyrimidones as Potential Antiepileptic Drugs
A series of 2-alkyl-3-arylpyrido[2,3-d]pyrimidones were synthesized for testing as potential antiepileptic drugs. The goal was to achieve better neurological activity and/or lower toxicity than displayed by a series of 2-alkyl-3-aryl-4(3H)-quinazolinones prepared previously in our research group. …
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Synthesis and X-ray Diffraction Structures of 2-(2-thienylidene)-4,5-bis-(diphenylphosphino)-4-cyclopenten-1,3-dione and fac-BrRe(CO)3[2-(2-thienylidene)-4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione]
Treatment of 4,5 bis-(diphenylphosphino)-cyclopenten-1,3 dione with thiophene carboxyaldehyde in dichloromethane, in the presence of molecular sieves results in a new heterocyclic compound, 2-(2-thienylidene)-4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (ligand), with a high yield. This …
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I. Solution Photochemistry of Camphor II. Synthesis and Solution Photochemistry of 2, 2-Dimethylcyclobutanone
<p>I. Solution Photochemistry of Camphor<br>Irradiation of camphor in solutions of 95% ethanol or n-heptane produces mainly α-campholenic aldehyde. In ethanol a bicyclic acetal is also formed, while in n-heptane a bicyclic enol ether is formed instead of the acetal. Deuterium labelling experiments …
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A study of the aromatic cyclodehydration of 2-(2-naphthylmethyl)- 2'-chloro-5'-methylbenzophenone
In a recent study of cyclodehydrogenation reactions of potential carcinogenic or carcinolytic hydrocarbons Zajac pointed out that ring closure of 12-(3-methylphenyl)- benz[a]anthracene might take place at either of the two ortho positions or the phenyl ring. These positions are not equivalent with …
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Evaluation of 2+2 Alternative Teacher Performance Appraisal Program in Shanxi, People's Republic of China
<p>This dissertation examined the effectiveness of the 2+2 Alternative Teacher Performance Appraisal System that has been implemented as one of the educational reform efforts in Shanxi province in China. All 78 teachers in Grade One in the six schools participated in the study. The outcomes …
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Study of 4(E)-Trans-6, 7-Epoxy-2, 2-Dimethyl-4-Decen-3-One
Hepoxilins are a group of compounds which are biologically active in the body. One of the hepoxilins is vital in the release of insulin. The sites that metabolism chemistry of the hepoxilin molecule takes place will be investigated using a model compound. The model compound, …
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