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Related Concept Videos

¹H NMR: Pople Notation01:09

¹H NMR: Pople Notation

The Pople nomenclature system classifies spin systems based on the difference between their chemical shifts. Coupled spins are denoted by capital letters with subscripts indicating the number of equivalent nuclei. When the coupled nuclei have well-separated chemical shifts, they are assigned letters that are far apart in the alphabet, such as A and X. When the difference in chemical shifts is small, coupled nuclei are named using adjacent letters of the alphabet (AB, MN, or XY).
A proton...
Chemical Symbols01:09

Chemical Symbols

A chemical symbol is an abbreviation that is used to indicate an element or an atom of an element. For example, the symbol for mercury is Hg. We use the same symbol to indicate one atom of mercury (microscopic domain) or to label a container of many atoms of the element mercury (macroscopic domain).
Some symbols are derived from the common name of the element; others are abbreviations of the name in another language. Most symbols have one or two letters, but three-letter symbols have been used...
Molecular Compounds: Formulas and Nomenclature03:10

Molecular Compounds: Formulas and Nomenclature

Molecular compounds or covalent compounds result when atoms share electrons to form covalent bonds. Since there is no electron transfer, molecular compounds do not contain ions; instead, they consist of discrete, neutral molecules.
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
Nomenclature of Alkynes02:39

Nomenclature of Alkynes

Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of alkynes follows a set of rules similar to alkanes and alkenes; however, alkynes bear the suffix "-yne" instead of "-ane" or "-ene." There are two approaches to naming alkynes:

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Tablet color coating with pigments.

Journal of the American Pharmaceutical Association. American Pharmaceutical Association·1958
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Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds
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Published on: October 15, 2019

Experimental compound letter designations.

H Engelbert

    Methods of Information in Medicine
    |July 9, 2011
    PubMed
    Summary

    Companies commonly use letter and number codes for experimental compounds. This study presents a comprehensive list of over 250 such company-specific designations, aiding in compound identification and research.

    Area of Science:

    • Chemistry
    • Pharmacology
    • Drug Discovery

    Background:

    • Experimental compounds require unique identifiers before formal naming.
    • Various pharmaceutical and chemical companies utilize proprietary alphanumeric codes.

    Purpose of the Study:

    • To compile and present a comprehensive list of company-specific experimental compound designations.
    • To facilitate easier identification and cross-referencing of chemical entities in research.

    Main Methods:

    • Compilation of a database of over 250 alphanumeric compound identifiers.
    • Categorization based on originating company or research institution.

    Main Results:

    • A substantial list of over 250 unique letter designations for experimental compounds.

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    Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes
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  • Demonstration of the diverse coding systems employed across different organizations.

    • Conclusions:

    • Standardized or centralized databases of compound codes could improve research efficiency.
    • Understanding these designations is crucial for researchers working with novel chemical entities.