Results 71 to 80 of about 17,602 (278)

Ageing in the Danube gorges population (9500-5500 BC): Tooth cementum annulation method [PDF]

Starinar, 2012
Tooth cementum annulation, the microscopic method for the determination of an individual’s age, gives results that are highly correlated with the chronological age of an individual.
Radović Marija B.
doaj   +1 more source

Enantioselective [4+2] Annulation to the Concise Synthesis of Chiral Dihydrocarbazoles

iScience, 2020
Summary: A highly efficient phosphine-catalyzed enantioselective [4 + 2] annulation of allenoates with 3-nitroindoles or 3-nitrobenzothiophenes has been developed.
Haiyang Wang, Qingdong Hu, Mingxu Wang, Chang Guo   +3 more
doaj   +1 more source

AGRICULTURE - Cumul d'exploitation / Refus / Annulation

, 1973
AGRICULTURE - Cumul d'exploitation / Refus / Annulation. In: Études et dossiers (Institut d'études judiciaires de Rennes), Tome 1, 1973-1. pp.

core   +2 more sources

Glycine-Based [3+2] Cycloaddition for the Synthesis of Pyrrolidine-Containing Polycyclic Compounds

Molecules
The synthesis of pyrrolidine compounds with biological interest is an active research topic. Glycine could be a versatile starting material for making pyrrolidine derivatives.
Tieli Zhou, Xiaofeng Zhang, Desheng Zhan, Wei Zhang   +3 more
doaj   +1 more source

annulation

, 2008
Citation: 'annulation' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.A00367 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms.
openaire   +1 more source

An expedient cyclopentenone annulation protocol

, 1991
A short and efficient procedure of general applicability for 1→2 annulation is ...
Srinivas Rao Karra, Karra , Srinivas Rao, Goverdhan Mehta, Mehta, Goverdhan   +3 more
core   +1 more source

Monosubstituted N‐Arylhydroxylamine Chemistry: Integrating Contemporary Synthetic Approaches for the Efficient Construction of Diverse Heterocyclic Scaffolds

Chemistry – A European Journal, EarlyView.
Monosubstituted N‐arylhydroxylamines represent a unique subclass of hydroxylamines that act as pivotal intermediates in redox transformations and as versatile platforms for further synthetic transformations. They serve as key building blocks in the synthesis of architecturally complex heterocycles and other valuable organic compounds.
Michael G. Kallitsakis, Kyriakos D. Nikopoulos, Ioannis N. Lykakis   +2 more
wiley   +1 more source

Multiple Hydrogen-Bonding Bifunctional Thiourea-Catalyzed Asymmetric Dearomative [4+2] Annulation of 3-Nitroindoles: Highly Enantioselective Access to Hydrocarbazole Skeletons

, 2017
A method for the enantioselective construction of hydrocarbazole skeletons through dearomative [4 + 2] annulation of 3-nitroindoles with Nazarov reagents is reported.
Zhao, JR, Yuan, WC, Chen, XZ, Yue, DF, Zhou, Y, Xu, XY, Zhang, XM, Yuan, WC (reprint author), Chinese Acad Sci, Natl Engn Res Ctr Chiral Drugs, Chengdu Inst Organ Chem, Chengdu 610041, Sichuan, Peoples R China.   +7 more
core   +1 more source

Flipping the Card With Enantiodivergent Organocatalysis

Chemistry – A European Journal, EarlyView.
This minireview elaborates on recent organocatalytic strategies for achieving enantiodivergence—the ability to access both product enantiomers using a single chiral catalyst. It highlights how achiral stimuli, such as solvent polarity and chemical additives, along with minimal catalyst modifications, trigger stereochemical inversions in reactions ...
Debora Iapadre, Alessio Carioscia, Alessandro Brusa, Armando Carlone   +3 more
wiley   +1 more source

Annulation de séance

, 1899
Annulation de séance. In: Le Globe. Revue genevoise de géographie, tome 38, 1899.

core   +1 more source