The fixation of CO(2) on Zn(II) chelates in alcoholic medium was studied in efforts to synthesize alkyl carbonates. In the presence of a base, such as NEt(3), the tetraazacyclododecane complex of Zn(II) in alcoholic solution binds CO(2) and forms a &mgr;(3)-carbonate complex. This complex was characterized by NMR spectroscopy and X-ray analysis. Crystal data: orthorhombic; space group Pcba; a = b = c = 21.850(5) Å; alpha = beta = gamma = 90 degrees; V = 10431.7(6) Å(3); Z = 8. The central Zn atom is coordinated to the four nitrogen donor atoms and to one oxygen of the bridging carbonate group. In an organic solvent such as DMSO, the complex exists in equilibrium with the decarboxylated Zn(II) complex. In addition, a Zn(II)(cyclen)(ethanol) complex was isolated and characterized by X-ray analysis. Crystal data: monoclinic; space group P2(1)/n; a = 12.707(5), b = 11.780(5), c = 15.642(5) Å; alpha = gamma = 90 degrees; beta = 105.250(5) degrees; V = 2259.0 (6) Å(3); Z = 4. The central Zn atom is coordinated to four nitrogen donor atoms and the oxygen of ethanol. We were not successful in converting this complex to the ethyl carbonate complex. The results of this study are discussed in reference to those published in the literature.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/ic961368t | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Enzymatic Cascades for Stereoselective and Regioselective Amide Bond Assembly.
Angew Chem Int Ed Engl
January 2025
The University of Manchester, School of Chemistry & Manchester Institute of Biotechnology, 131 Princess Street, M1 7DN, Manchester, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND.
Amide bond formation is fundamental in nature and is widely used in the synthesis of pharmaceuticals and other valuable products. Current methods for amide synthesis are often step and atom inefficient, requiring the use of protecting groups, deleterious reagents and organic solvents that create significant waste. The development of cleaner and more efficient catalytic methods for amide synthesis remains an urgent unmet need.
View Article and Find Full Text PDFEngineering carbon assimilation in plants.
J Integr Plant Biol
January 2025
Key Laboratory of Seed Innovation, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.
Carbon assimilation is a crucial part of the photosynthetic process, wherein inorganic carbon, typically in the form of CO, is converted into organic compounds by living organisms, including plants, algae, and a subset of bacteria. Although several carbon fixation pathways have been elucidated, the Calvin-Benson-Bassham (CBB) cycle remains fundamental to carbon metabolism, playing a pivotal role in the biosynthesis of starch and sucrose in plants, algae, and cyanobacteria. However, Ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO), the key carboxylase enzyme of the CBB cycle, exhibits low kinetic efficiency, low substrate specificity, and high temperature sensitivity, all of which have the potential to limit flux through this pathway.
View Article and Find Full Text PDFEvolutionary Dynamics of RuBisCO: Emergence of the Small Subunit and its Impact Through Time.
Mol Biol Evol
January 2025
Department of Bacteriology, University of Wisconsin-Madison, Madison, WI, USA.
Ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) is an ancient protein critical for CO2-fixation and global biogeochemistry. Form-I RuBisCO complexes uniquely harbor small subunits that form a hexadecameric complex together with their large subunits. The small subunit protein is thought to have significantly contributed to RuBisCO's response to the atmospheric rise of O2 ∼2.
View Article and Find Full Text PDFMagnetotactic bacteria from diverse Pseudomonadota families biomineralize intracellular Ca-carbonate.
ISME J
January 2025
Université Aix-Marseille, CNRS, CEA, UMR7265 Institut de Biosciences and Biotechnologies d'Aix-Marseille, CEA Cadarache, F-13108 Saint-Paul-lez-Durance, France.
Intracellular calcium carbonate formation has long been associated with a single genus of giant Gammaproteobacteria, Achromatium. However, this biomineralization has recently received increasing attention after being observed in photosynthetic Cyanobacteriota and in two families of magnetotactic bacteria affiliated with the Alphaproteobacteria. In the latter group, bacteria form not only intracellular amorphous calcium carbonates into large inclusions that are refringent under the light microscope, but also intracellular ferrimagnetic crystals into organelles called magnetosomes.
View Article and Find Full Text PDFDifferential diversity and structure of autotrophs in agricultural soils of Qinghai Province.
Microbiol Spectr
January 2025
Key Laboratory of Medicinal Plant and Animal Resources of the Qinghai-Tibetan Plateau in Qinghai Province, Academy of Plateau Science and Sustainability, School of Life Science, Qinghai Normal University, Xining, China.
Unlabelled: The biodiversity of CO-assimilating bacterial communities is pivotal for carbon sequestration in agricultural systems. Changes in the diversity, structure, and activity of the soil chemolithoautotrophic bacteria were examined in four agricultural areas, Dulan (DL), Gonghe (GH), Huzhu (HZ), and Datong (DT) counties in Qinghai Province, where wheat, oilseed rape, and barley were planted. This process was performed using Illumina amplicon sequencing of the ribulose-1,5-bisphosphatecarboxylase/oxygenase (RubisCO) gene ( Form I) and activity data.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!