IUPAC Nomenclature Home Page The full text of IUPAC and IUBMB organic and biochemical nomenclature recommendations
PubChem PubChem is the world's largest collection of freely accessible chemical information Search chemicals by name, molecular formula, structure, and other identifiers Find chemical and physical properties, biological activities, safety and toxicity information, patents, literature citations and more
www. openmolecules. org This page lets you easily convert IUPAC names, common names, SMILES codes, CAS numbers, and other identifiers into chemical structures On the back end it employs OpenChemLib to decode SMILES codes, the OPSIN library developed by Daniel Lowe, data from PubChem, various drug and natural product dictionaries, and openmolecules software 3D structure images are random low energy conformers
International Union of Pure and Applied Chemistry - Wikipedia IUPAC was established in 1919 as the successor of the International Congress of Applied Chemistry for the advancement of chemistry Its members, the National Adhering Organizations, can be national chemistry societies, national academies of sciences, or just other bodies representing chemists
What We Do - IUPAC - IUPAC | International Union of Pure and Applied . . . The International Union of Pure and Applied Chemistry (IUPAC) is the world authority on chemical nomenclature, terminology (including the naming of new elements in the periodic table), standardized methods for measurement, atomic weights and many other critically-evaluated data
1. 5: IUPAC Nomenclature - Chemistry LibreTexts This page explains the IUPAC naming system for alkanes, detailing key concepts like the longest continuous chain (LCC) principle, alkyl group nomenclature, and numbering rules for substituents It …
ATOMIC WEIGHTS OF THE ELEMENTS 2023 ATOMIC WEIGHTS OF THE ELEMENTS 2023 These tables are based on the 2021 table with changes from the 2019 table for the values of Ar, Hf, Ir, Pb and Yb and changes to the uncertainty for Al, Au, Co, F, Ho, Mn, Nb, Pa, Pr, Rh, Sc, Tb, Tm, and Y The values of Gd, Lu and Zr were revised and published in 2024 https: iupac qmul ac uk AtWt World Wide Web version of atomic weight data originally