13,702 research outputs found
Formation of dibutyl carbonate and butylcarbamate via CO2 insertion in titanium(IV) butoxide and reaction with n-butylamine
No full textThe species resulting from insertion of 12CO2 and 13CO2 into titanium(IV) butoxide is for the
first time fully characterized by means of infrared and nuclear magnetic resonance spectroscopy. Results show
formation of Ti-monobutylcarbonate, that easily undergoes nucleophilic attack by an aliphatic amine.
The hydrolysis of the resulting species produces butylcarbamate and dibutylcarbonate as the only main
products. Characterization results of the carbonate-like adduct, along with its reactivity with amine
molecules open the route to new ways of CO2 utilization as building block for valuable organic
compounds
Production of dibutyl carbonate by insertion of CO2 in titanium(IV) tetrabutoxide
No full textThe species resulting from insertion of 12CO2 and 13CO2 into titanium(IV) butoxide is for the first time fully characterized by means of infrared and nuclear magnetic resonance spectroscopy. Results show formation of Ti-monobutylcarbonate, that easily undergoes nucleophilic attack by an aliphatic amine. The hydrolysis of the resulting species produces butylcarbamate and dibutylcarbonate as the only main products. Characterization results of the carbonate-like adduct, along with its reactivity with amine molecules open the route to new ways of CO2 utilization as building block for valuable organic compounds
Thiocarbamoyl Disulfides as Inhibitors of Urease and Ammonia Monooxygenase: Crystal Engineering for Novel Materials
No full textThe environmental sustainability of soil nitrogen fertilization is essential for the primary production of food for an expanding human population. In this framework, the control of soil enzymatic activities that impact the release of N-based compounds either in the atmosphere or in the underground waters is critical. The two enzymes that act as key players in the biogeochemical cycle of nitrogen are urease and ammonia monooxygenase (AMO), respectively, nickel- and copper-dependent enzymes. This article reveals the high efficacy of three molecules of the thiurams family, namely, thiram (tetramethylthiuram disulfide, TMTD), disulfiram (tetraethylthiuram disulfide, TETD), and tetraisopropylthiuram disulfide (TIPTD) as inhibitors of both the activities of jack bean (Canavalia ensiformis) urease (JBU) and Nitrosomonas europaea AMO. The water solubility of these compounds was significantly improved by the preparation of three novel inclusion complexes of beta-cydodextrin with TMTD, TETD, and TIPTD by mechanochemical synthesis, using green technology. The resulting beta-CD.thiuram complexes beta-CD.TMTD, (beta-CD)(2)-TETD, and (beta-CD)(2).TIPTD were all characterized by powder X-ray diffraction, thermogravimetric analysis, and solid-state NMR. A conformational polymorph of TIPTD was also detected and isolated via hot stage microscopy, and structurally characterized by single-crystal X-ray diffraction. Biological tests of enzymatic inhibition performed on JBU and AMO with the beta-CD.thiuram complexes showed the same inhibition efficacy as the isolated molecules, suggesting that the active species is, in all cases, the free thiuram, likely in equilibrium with the adduct in solution. These results have a great potential for improving the nitrogen use efficiency of soil fertilizers for a greener environment
Mr. Melvin J. Collier, RWWL AUC, June 2011
No full textThis video is a conversation with Mr. Melvin J. Collier. Mr. Collier talks about his book, "From Mississippi to Africa: A Journey of Discovery". Daniel Le, AUC Woodruff Library, is the interviewer
Interview Excerpt of Mr. Donald M. Crawford, Sr.
No full text(1948-2018) Donald Mitchell Crawford, Sr. (“DC”), musician, author, and educator, was born on May 24, 1948, and was a lifelong resident of Birmingham, AL. His father and mother owned and operated “C & S Charter Tours Bus Company,” the first black-owned bus company in the state of Alabama. Crawford was a 1966 graduate of Western Olin High School in Birmingham, AL. Crawford was an outstanding drum major, playing first chair alto saxophone under the tutelage of the late Amos F. Gordon, Sr. After high school, he received a music scholarship to Alabama State University (ASU) where he earned both his Bachelor’s and Master’s Degrees in Music Education and was later inducted into the “School of Music Hall of Fame” at ASU. He was the youngest ever inducted into the Alabama Jazz Hall of Fame. He was a veteran of the U.S. Army and performed with the 291 st and 283rd Army Band in Fort Bennett, GA. DC was Band Director at Jackson Olin High School and taught in the Birmingham School System for over thirty-five years. His love for music and performing lead him after his retirement to serve as Band Director for Miles College.
Crawford is the author of “The Wheels of the Birmingham Civil Rights Movement.” This book chronicles the lives of his late father and mother, Worcy and Christine Pride Crawford, and the role he and the company played in the Birmingham Civil Rights Movement
Interesting anecdotes, memoirs, allegories, essays, and poetical fragments, [electronic resource] : tending to amuse the fancy, and inculcate morality. By Mr. Addison.
No full textMr. Addison is a pseudonym.On p. 1: Anecdote of Cromwell.Electronic reproduction.English Short Title Catalog,Reproduction of original from British Library
Interesting anecdotes, memoirs, allegories, essays, and poetical fragments, [electronic resource] : tending to amuse the fancy, and inculcate morality. By Mr. Addison.
No full textMr. Addison is a pseudonym.P. 1 contains an 'Anecdote' beginning "A certain nobleman, .. ".Electronic reproduction.English Short Title Catalog,Reproduction of original from British Library
Interesting anecdotes, memoirs, allegories, essays, and poetical fragments, [electronic resource] : tending to amuse the fancy, and inculcate morality. By Mr. Addison.
No full textMr. Addison is a pseudonym.On p. 1: Anecdote of Doctor Young.Electronic reproduction.English Short Title Catalog,Reproduction of original from British Library
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