In the nomenclature of organic chemistry, a locant is a term to indicate the position of a functional group or substituent within a molecule. The International...

recommendations of the IUPAC. Stereodescriptors are often used in combination with locants to clearly identify a chemical structure unambiguously. The descriptors...

skipped if they do not apply. Has the lowest-numbered locant (or locants) for heteroatoms. Locants are the numbers on the carbons to which the substituent...

indicated by a numerical locant immediately preceding the "-yne" suffix, or locants in the case of multiple triple bonds. Locants are chosen to be as low...

three carbon atoms, the preferred IUPAC name is 2-methylpropane but the locant (2-) is typically omitted in general nomenclature as redundant; C2 is the...

coefficients of a set of linear equations (see Cramer's rule). That an associated locant number represents the location of a covalent bond in an organic compound...

mistake fixed in the errata Archived 2019-08-01 at the Wayback Machine. The locant is omitted according to P-14.3.4.2 (d), p. 31. "Front Matter". Nomenclature...

Locants of the morphine molecule...

terminology, n (or ω) represents the locant of the methyl end of the molecule, while the number n−x (or ω−x) refers to the locant of its nearest double bond. Thus...

Δ4-androstene-3,11,17-trione). However, the Nomenclature of Steroids recommends the locant of a double bond to be always adjacent to the syllable designating the unsaturation...

numbered in the name. The IUPAC 2013 Rules however do require an explicit locant for most substituents in a preferred IUPAC name. The substituent name is...

1039/9781849733069-FP001. ISBN 978-0-85404-182-4. For example, the omission of the locant '1' in 2-chloroethanol, while permissible in general usage, is not allowed...

tetranor, etcetera is used. The prefix is preceded by the position number (locant) of the carbon atoms that disappear (for example 2,3-dinor). The original...

has the retained name 'urea', which is the preferred IUPAC name, with locants N and N′, as shown above the structure below. The systematic name is 'carbonic...

indicated by a numerical locant immediately preceding the "-yne" suffix, or 'locants' in the case of multiple triple bonds. Locants are chosen so that the...

Left: The structure of pyrimidine with the locants for ring atoms marked. Right: 5-Fluorouracil, a fluoropyrimidine formally named as 5-fluoro-1H,3H-pyrimidine-2...

have been used to distinguish isomers, and 'xylidine' for which numerical locants, such as 2,3-, have been used, are no longer recommended, nor are the corresponding...

order: {[( )]}. Locants indicate the position of structural features, e.g., poly(4-chlorostyrene). If the name is one word and has no locants, then the enclosing...

Flavanone skeleton with locants...

tropane-ring, with only its tropane locants given. Middle: Cocaine with its numerical substitution position locants. 2′ (6′) = ortho, 3′ (5′) = meta &...

retain a definite volume but no fixed shape. liquid–liquid extraction (LLE) locant London dispersion forces A type of weak intermolecular force. Contents: ...

have been used to distinguish isomers, and 'xylidine' for which numerical locants, such as 2,3-, have been used, are no longer recommended, nor are the corresponding...

compounds is known as the silicon α and β effects, after the corresponding locants. These stabilities occur because of a partial overlap between the C–Si...

general nomenclature. The structure is substitutable at any position. Locants 2, 3, and 4 are recommended, not o, m, and p. "TOXNET". toxnet.nlm.nih...

general nomenclature. The structure is substitutable at any position. Locants 2, 3, and 4 are recommended, not o, m, and p. Haynes, William M., ed. (2016)...

multiplicative prefix if there are several heteroatoms of the same type; and locants to indicate the relative positions of the different atoms. Hantzsch–Widman...

same. Dimers of phenyltropanes, connected in their dual form using the C2 locant as altered toward a carboxamide structural configuring (in contrast and...

general nomenclature. The structure is substitutable at any position. Locants 2, 3, and 4 are recommended, not o, m, and p. Haynes, p. 3.116 Haynes,...

triplet state is named ethane-1,1,1,2-tetrayl. Ethenylidene (without the -1- locant) or vinylidene, is used, systematically, to refer to the substituent group...

along with the locants. Short form: It is usually desirable to shorten the notation by eliminating the anomeric carbon atoms locants, the parentheses...