Results 161 to 170 of about 288,749 (288)

Hydrogen Isotope Exchange in Pyridine Catalyzed by an Iron(II) Imido Complex: Counterion‐Directed Regioselectivity

Angewandte Chemie, EarlyView.
Anionic high‐spin iron(II) imido complexes are catalysts for the hydrogen isotope exchange (HIE) reaction with pyridine as the substrate. The alkali metal counter‐cation plays critical roles in activating the substrate and facilitating deuteration. These complexes catalyze site‐selective α‐, α,β,γ‐, and β,γ‐deuteration of pyridine, where the counter ...
Bin Feng, Guorong Li, Yafei Gao, Nobuyuki Yamamoto, Maren Pink, Qian Peng, Jeremy M. Smith   +6 more
wiley   +2 more sources

Carbon isotope effects in cometabolic oxidation of halogenated organics by a methanotroph. [PDF]

Environ Sci Pollut Res Int
Rauniyar P, Gafni A, Cupples A, Bernstein A.   +3 more
europepmc   +1 more source

Water deficit and potassium affect carbon isotope composition in cassava bulk leaf material and extracted carbohydrates. [PDF]

Front Plant Sci, 2023
Van Laere J, Merckx R, Hood-Nowotny R, Dercon G.   +3 more
europepmc   +1 more source

Iron‐Photocatalyzed C(sp3)–H Phosphonylation of Alkanes

Angewandte Chemie, EarlyView.
Alkyl phosphonates are valuable motifs that can be prepared by phosphonylations of various common functional groups. However, direct phosphonylations of C(sp3)–H bonds are limited to activated positions. Herein, we report an iron‐photocatalyzed phosphonylation of unactivated C(sp3)–H bonds using a novel phosphite radical trap, which is equipped with an
Ya Dong, Wangyujing Han, Hanwen Zhang, Santosh K. Pagire, Harry Meats, Adam Noble, Varinder K. Aggarwal   +6 more
wiley   +2 more sources

Metabolic controls on the carbon isotope fractionations of bacterial fermentation. [PDF]

Proc Natl Acad Sci U S A
Mueller EP, Heuer VB, Leadbetter JR, Hinrichs KU, Sessions AL.   +4 more
europepmc   +1 more source

Characterization of vanillin carbon isotope delta reference materials. [PDF]

Anal Bioanal Chem, 2022
Chartrand MMG, Meija J, Hélie JF, Middlestead P, Ramalingam M, Aziz AA, Mester Z.   +6 more
europepmc   +1 more source

Room‐Temperature Gas‐Phase CO2‐to‐C3 Coupling by a 4f‐Aromatic Cluster

Angewandte Chemie, EarlyView.
We engineered a 4f metalla aromatic cluster, PrB2C2−, that enables efficient sequential C−C coupling with CO2 at room temperature, yielding a linear C3 backbone. This system provides a complete theoretical catalytic cycle and establishes a new design principle for lanthanide mediated CO2 activation.
Feng‐Xiang Zhang, Xiao‐Wang Li, Ning‐Zheng Li, Sheng‐Gui He, Yu‐Chen Zhang, Li‐Li Xing, Donald G. Truhlar, Jia‐Bi Ma   +7 more
wiley   +2 more sources

Refined chronologies of magnetochron M0r reveal asynchronous terrestrial and marine carbon isotope responses to Oceanic Anoxic Event 1a. [PDF]

Sci Adv
Lu GM, Shen ZS, Deng CL, Ogg JG, Sun MD, Li MS, Qin HF, Zhu RX, Zhou ZH, Xu YG.   +9 more
europepmc   +1 more source

CO₂ electroreduction favors carbon isotope ¹²C over ¹³C and facilitates isotope separation. [PDF]

iScience, 2023
Barecka MH, Kovalev MK, Muhamad MZ, Ren H, Ager JW, Lapkin AA.   +5 more
europepmc   +1 more source

A Revised Model for Muscarine Biosynthesis Involving Lysine Trimethylation

Angewandte Chemie, EarlyView.
The fatal mushroom toxin l‐(+)‐muscarine is one of the most prominent natural products. We elucidated its biosynthetic origin in the sweating mushroom Collybia rivulosa based on incorporation of stable isotope‐labeled compounds and extensive mass spectrometric analyses.
Sebastian Dörner, Kai Rogge, Felix Trottmann, Christian Hertweck, Dirk Hoffmeister   +4 more
wiley   +2 more sources