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Preparation of flat dendrimers and polycyclic aromatic hydrocarbons connected via 1,3,5-triethynylbenzene core.

Preparation of flat dendrimers and polycyclic aromatic hydrocarbons connected via 1,3,5-triethynylbenzene core.

Date: December 2008
Creator: Jung, Jiyoung
Description: Flat dendrimers, consisting of a hexavalent aromatic core and rigid ethynyl units locked in place by ether connections were developed based upon the divergent synthetic method. Alternating functional groups were adopted on each site of the hexa-substituted benzene, in order to avoid undesired cyclization pathways. The flat structures of conjugated dendrimers would allow investigation on the discotic liquid crystal properties. In addition, these ethylnyl dendrimers are expected to show directed energy and electron transfer with a highly conjugated system, and thus are effective in the preparation of photoreactive materials such as electronic sensors or light harvesting materials. Conjugated polycyclic aromatic hydrocarbons, consisting of naphthalene, anthracene, pyrene, and phenanthrene groups connected via 1,3,5-triethynylbenzene cores, were synthesized. These molecules exhibited luminescence properties and the π-complexation with a mercury trifunctional lewis acid are expected to enhance the phosphorescence in the presence of the heavy metal due to the spin-orbit coupling. Besides, owing to the presence of heavy metal atom in the Au (I) complexes linked by s-bonded triethynyltriphenylene luminophore, the phosphorescence occurs from a metal-centered emission. The conjugated organic luminophores have been developed to produce excellent quantum efficiencies, brightness, and long lifetimes.
Contributing Partner: UNT Libraries
Preparation of N-Substituted Hydroxylamines from Oxaziridines

Preparation of N-Substituted Hydroxylamines from Oxaziridines

Date: January 1968
Creator: Truitt, Sharon G.
Description: In many series of compounds, intensity of biological activity and chemical reactivity are proportional. Generally whenever a alkyl group replaces a reactive hydrogen atom, as would be the case for an N-substituted hydroxylamine as compared to hydroxylamine, the over-all biological activity of the resulting compound is lower than that of its nonalkylated analogue. Since toxicity and physiological activity are not proportional, this comparison can only suggest possible types of derivatives to prepare and test.
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The Preparation of Pyridinium Derivatives by the Knoevenagel Condensation

The Preparation of Pyridinium Derivatives by the Knoevenagel Condensation

Date: May 1955
Creator: Miller, Eugene James
Description: An attempt is made in the work described in this paper to extend the series started by Hall and Platas by means of a Knoevenagel condensation between 3-hydroxy-1,4-naphtho-quinone-2-(4-methylpyridinium) anhydride and various aromatic aldehydes giving rise to a series of unsaturated substituents on the four position of the pyridine ring.
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Preparation of Pyridinium Derivatives of 2,3-Dichloro-5(8?)-Nitro-1,4-Naphthoquinone

Preparation of Pyridinium Derivatives of 2,3-Dichloro-5(8?)-Nitro-1,4-Naphthoquinone

Date: 1955
Creator: Mahon, Frank
Description: This paper describes the preparation of pyridine derivatives of 2,3-dichloro-5(8?)-nitro-1,4-naphthoquinone. A method for the nitration of 2,3-dichloro-1,4-naphthoquinone is also described. Certain 4-n-alkyl, 3,4-dialkyl, and 4-cycloalkyl pyridine derivatives are caused to undergo condensation reactions with the nitrated naphthoquinone, giving rise to a series of compounds of the preceding type (X). All of the compounds prepared will be tested for anti-tubercular activity by Parke-Davis and Company.
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The Preparation of Stones of Walker County, Texas for Use as Sets in Jewelry

The Preparation of Stones of Walker County, Texas for Use as Sets in Jewelry

Date: 1946
Creator: Pledger, Leon Monroe
Description: Since the East Texas area has many minerals in the categories which yield semiprecious stones of commercial value--jasper, wood agate, wood opal, and silicified stone, the author undertook this study to determine: (1) the extent which these minerals could be utilized as sources for gems; (2) the equipment necessary for cutting and polishing the stones; and (3) the techniques for finishing the gems.
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Preparation of Styrl Derivatives of 2,3-dimethyl-4,9-dioxo-1(2-propyl)-naphth[2,3-d]

Preparation of Styrl Derivatives of 2,3-dimethyl-4,9-dioxo-1(2-propyl)-naphth[2,3-d]

Date: June 1963
Creator: Hayes, David Wayne
Description: A series of compounds were prepared by condensing 2,3-dimethyl-4,9-dioxo-1-(2-propyl)-naphth[2,3-d] imidazolium iodide with various aromatic aldehydes.
Contributing Partner: UNT Libraries
Preparation of the Weatherford, Texas, Elementary Teacher to Teach Art in the Self-Contained Classroom

Preparation of the Weatherford, Texas, Elementary Teacher to Teach Art in the Self-Contained Classroom

Date: August 1964
Creator: Law, Frances B.
Description: This paper is concerned with the preparation needed by the elementary classroom teacher to teach art in the self-contained classroom and with improving the program of art education in the elementary schools of the Weatherford Independent School District of Weatherford, Texas.
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Preparation of Various Amino Alcohol Derivatives of p-Chlorophenoxyacetic Acid and Phenylacetic Acid

Preparation of Various Amino Alcohol Derivatives of p-Chlorophenoxyacetic Acid and Phenylacetic Acid

Date: 1947
Creator: Richardson, Eugene E.
Description: This thesis deals with the preparation of dialkylaminoalkoxy derivatives of p-chlorophenoxyacetic acid and phenylacetic acid.
Contributing Partner: UNT Libraries
Preschool Mathematics: An Examination of One Program's Alignment with Recommendations from NAEYC and NCTM

Preschool Mathematics: An Examination of One Program's Alignment with Recommendations from NAEYC and NCTM

Date: December 2010
Creator: Johnston, Elisabeth
Description: The purpose of this study was to determine the extent to which a preschool program followed the recommendations outlined by the National Association for the Education of Young Children (NAEYC) and the National Council of Teachers of Mathematics (NCTM) in their joint position statement "Early Childhood Mathematics: Promoting Good Beginnings." Six teachers were randomly selected from three of the preschool program's six locations that are situated in an urban city in North Texas. Two parts of this program's approach to mathematics were investigated: the teachers' instructional practices and the program's curricular materials. Data came from observations using the Classroom Observation of Early Mathematics-Environment and Teaching (COEMET) protocol and field notes. Each teacher participated in three interviews over the course of this research. Analyses of these sources provided insights into teachers' instructional practices for mathematics. Reviews of curricular documents and lesson plans for mathematics instruction provided information pertaining to the math curriculum used at this preschool program. All of these data sources were analyzed using the framework presented in NAEYC and NCTM's position statement. Analysis of the data indicated that, although teachers did not have any knowledge of these guidelines, teachers followed some of these recommendations; such as presenting children with ...
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Preschool Teachers' Self-reported Levels of Preparation for Classroom Behavior Management

Preschool Teachers' Self-reported Levels of Preparation for Classroom Behavior Management

Date: August 2013
Creator: Lohmann, Marla J.
Description: Research indicates that serious behavior problems begin during the early childhood years. The study examined the perceived preparedness of teachers related to behavior management as well as preschool teachers' usage of evidence-based prevention and intervention strategies. The data indicates that preschool teachers feel prepared for managing aggression in their classrooms and report utilizing evidence-based prevention and intervention strategies regularly. Additionally, the data shows a weak relationship between teacher variables and the likelihood of feeling prepared for managing aggression or utilizing evidence-based strategies. The results can be used to gain a better understanding of special education preschool teachers' training needs in regard to behavior management and managing behavior problems in the preschool classroom.
Contributing Partner: UNT Libraries