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	Locant - Wikipedia, the free encyclopedia
		A locant can be used in organic chemistry to indicate the position of a functional group within a molecule.
		The locant is the number of the carbon atom to which the oxygen atom is bonded.
		If the oxygen is bonded to an atom on either side (adjacent to an end carbon), the locant is 2 or 4; given the choice here, where the carbons are exactly equivalent, always choose the lower number.
	en.wikipedia.org /wiki/Locant (300 words)

	Enynes
		The alkene suffix "ene" minus the last "e" is inserted after the root with its locant before the root.
		The chain is numbered in accord with the first point of difference rule to either the alkene or alkyne units the lowest possible locant.
		The locant for the lowest numbered carbon of the alkene or alkyne is used in the name.
	www.chem.ucalgary.ca /courses/351/orgnom/alkynes/alkynes-03.html (263 words)

	Alkenes
		The root name is based on the longest chain containing both ends of the alkene unit, the C=C. The chain is numbered so as to give the alkene unit the lowest possible numbers.
		The locant for the first carbon of the alkene is used in the name.
		The C=C is unambiguously between C1 and C2 therefore the locant isn't required.
	www.chem.ucalgary.ca /courses/351/orgnom/alkenes/alkenes-01.html (256 words)

	Commands for General Use (Site not responding. Last check: 2007-11-02)
		Locant numbers (1-9) and bond descriptors (a-j) are defined as shown in the following diagram:
		The augument SUBSLIST takes a usual format except that the locant numbers 3a and 7a are replaced by 8 and 9.
		Locant numbering is usually defined as shown in the following diagram:
	www-texdev.ics.mq.edu.au /l2h/ChemTeX/xymtex/node71.html (203 words)

	3S-7
		The methylene group(s) lost is considered to include the highest numbered unsubstituted atom of the ring involved, and the locant of that lost methylene group precedes the prefix nor- in the nor-compound.
		The prefix is preceded by the (complex) locant(s) of the carbon atom(s) inserted.
		8a in compound 82 or 13a in compound 85 with the lower-numbered carbon atom as parent locant.
	alpha.qmw.ac.uk /~ugca000/iupac/steroid/3S07.html (689 words)

	R-5.7.5 Lactones, lactams, lactims, and analogues
		residue is replaced by two hydrogen atoms, preceded by a pair of locants indicating the points of attachment of the carbonyl group and the oxygen atom of the lactone, respectively; the locant for the carbonyl group is cited first, and, if there is a choice, is the lower locant.
		group after the name of the appropriate parent hydride preceded by a pair of locants describing the points of attachment of the sulfonyl group and oxygen atom, respectively; the locant for the sulfonyl group is cited first and, if there is a choice, is the lower locant.
		The locant for the point of attachment of the sulfonyl group is cited first and, where there is a choice, has preference over the imino group for lower locant.
	www.acdlabs.com /iupac/nomenclature/93/r93_521.htm (443 words)

	Isotopically modified compounds, H-2
		In general, in organic nomenclature locants for suffixes, unsaturation, free valences, etc., cited ahead of the parent are considered as part of the name.
		In this report the practice of citing the isotopic descriptor ahead of such locants is followed; in biochemical usage the isotopic descriptor is often cited after such locants.
		Identical locants corresponding to the same element are not repeated.
	www.chem.qmul.ac.uk /iupac/sectionH/H2.html (1319 words)

	Phanes, Part I, PhI-4.5
		Lowest locants are assigned to heteroatoms considered in the order of their priority, i.e., O > S > Se > Te > N > P > As > Sb > Bi > Si > Ge > Sn > Pb > B (refs.
		Since the primary locants for the "oxa" prefixes are also the same, the primary locant for the next most senior heteroatom, "thia", is compared and in the correct name the primary locant "1" is lower than the primary locant "5".)
		The primary locant sets for the senior prefix "oxa" are also the same in both cases, 1,2,8,9,10,16, but for the locant sets including composite locants, the locant set for the prefix "oxa" in 33a, 1
	www.chem.qmul.ac.uk /iupac/phane/PhI45.html (646 words)

	Esters and Amides
		The carbonyl group in the alkanoate family is always at the end of a carbon chain and as such is always position 1.
		As with the alkanals, alkanamides, and alkanoic acids the locant (1) is omitted on the alkanoate part of the name.
		The carbon chain not containing the carbonyl group may be attached at any carbon in the chain and so must have a locant when isomers are possible.
	www.perry.k12.mi.us /crawford/esters (485 words)

	Glossary: Organic and biochemistry
		A locant in a name is a prefix specifying the location of a substituent.
		These locants are discussed in the glossary entries for N- and n- and Greek letters.
		The capital N prefix is a locant for a group that is attached to a nitrogen.
	www.geocities.com /Athens/Thebes/5118/obc/glossary.htm (1703 words)

	2-Carb-10 (Site not responding. Last check: 2007-11-02)
		The locant 2 may be omitted if no ambiguity can arise, especially in a biochemical context.
		The stem names are formed from the corresponding aldose stem names (2-Carb-8.2) by replacing the ending '-ose' with '-ulose', preceded by the locant of the carbonyl group, e.g.
		If the carbonyl group is in the middle of a chain with an odd number of carbon atoms, a choice between alternative names is made according to 2-Carb-2.2.2>.
	alpha.qmw.ac.uk /~ugca000/iupac/2carb/10.html (257 words)

	Masked Name Regulations (Site not responding. Last check: 2007-11-02)
		"locant" means a numeral or Greek or Roman letter used in the name of a substance to indicate the positions of unsaturated bonds or attachments of chemical groups in a molecule; (symbole indicateur de position)
		(d) removing the locants and replacing each of one or more other distinctive elements with a non-descriptive term.
		(d) the name of the parent structure and the locant of a chemical group bonded to the parent structure; or
	laws.justice.gc.ca /en/C-15.31/SOR-94-261/text.html (737 words)

	[No title]
		Rule for writing the name: The position identifier (locant) is prefixed to the name of the branch using hyphens to separate the position identifiers from the name.
		If there are two or more of the same branch in a given molecule the prefixes di, tri, tetra, etc., are used together with a set of position identifiers, one for each of the branches, with the position identifiers separated by commas.
		IUPAC now puts the locant immediately in front of the group that it is positioning: hex-3-yne rather than 3-hexyne.
	www.wjhsd.net /~ajackson/appchmorganicchemistrynamingrules.doc (1183 words)

	Alkane Nomenclature
		The position of each group is listed separately by a locant number.
		The locant numbers are separated from each other by commas.
		In complicated structures the "first point of difference" rule is useful in determining the proper way to number the parent chain.
	www.wou.edu /las/physci/ch334/lecture/lecture5.htm (190 words)

	Lambda Convention Recommendations
		If the locant for an atom with a nonstandard bonding number is used in the name of the normal (standard) parent hydride, the
		When a choice is needed between the same skeletal atom in different valence states, the one in a nonstandard valence state is preferred for assignment of the lower locant.
		After the maximum number of noncumulative double bonds has been assigned according to Rule Lm-3.1, any ring atom with a bonding number of three or higher connected to adjacent ring atoms by single bonds only, and carrying one or more hydrogen atoms, is designated by the "indicated hydrogen" symbolism as described in Rule A-21.6 (Ref.
	www.chem.qmul.ac.uk /iupac/hetero/Lm1t4.html (831 words)

	Model of 1,6-Dichlorocyclohexene
		It is important to realize that the locant for a double bond indicates the first carbon only and that the second carbon is understood to be the locant + 1 position.
		In this compound the locant of the double bond is 1, which is omitted in the name, so the double bond is between carbon atoms 1 and 2 in the ring.
		Continuing the numbering around the ring gives the locant for the second chlorine as 6.
	wps.prenhall.com /wps/media/objects/724/741792/16dichlorocyclohexene.html (122 words)

	Rule A-3. Unsaturated Compounds and Univalent Radicals (ACYCLIC HYDROCARBONS)
		When, in cyclic compounds or their substitution products, the locants of a double bond differ by unity, only the lower locant is cited in the name; when they differ by more than unity, one locant is placed in parentheses after the other (see Rules A-31.3 and A-31.4).
		The generic names of these hydrocarbons (branched or unbranched) are "alkyne", "alkadiyne", "alkatriyne", etcThe chain is so numbered as to give the lowest possible numbers to the triple bonds.
		Only the lower locant for a triple bond is cited in the name of a compound.
	www.acdlabs.com /iupac/nomenclature/79/r79_53.htm (536 words)

	<ETD> Rosas-García: Towards the Design o..., App B (Site not responding. Last check: 2007-11-02)
		If it is not clear which locant set assigns the lowest numbers e.g.
		, 1,4,5,6 or 1,2,7,8 then the locant set that assigns the lowest number to the highest priority atom (CIP rules) is chosen.
		In the previous locant sets, if the highest priority atom can be either 2 or 4, then the locant set 1,2,7,8 should be chosen, despite the 7,8 being higher than 5 and 6.
	scholar.lib.vt.edu /theses/available/etd-51797-145925/unrestricted/full_text/appb.htm (267 words)

	Chapter 4 (Site not responding. Last check: 2007-11-02)
		When two different numbering schemes give equivalent sets of locants, choose the direction that gives the lower locant to the group that appears first in the name.
		Substitutive names of alcohols are developed by identifying the longest continuous chain that bears the hydroxyl group and replacing the -e ending of the corresponding alkane by the suffix -ol.
		The position of the -OH group is indicated by number, choosing the sequence that assigns the lower locant to the carbon that bears the -OH group.
	www.faculty.sfasu.edu /chengs/teaching/chapter4.htm (1608 words)

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	vnboards.ign.com /Message.aspx?topic=67470355 (708 words)

	logCat command
		Specifies that search patterns in locants are being specified in the "regular" expression language, rather than in the "sh" meta-language.
		Priorities can be specified as a number or as the symbolic representations, - for E_NONE, M for E_MANUAL, * for E_MINOR, ** for E_MAJOR, and *C for E_CRITICAL.
		Set debug flag, which causes locants to be printed at the beginning of the run and cause some statistics to be listed at the end of the run
	support.avaya.com /elmodocs2/ir/16845_1.htm (793 words)

	Definition of locant - Merriam-Webster Online Dictionary (Site not responding. Last check: 2007-11-02)
		Click here to search for another word in the Merriam-Webster Online Dictionary.
		For More Information on "locant " go to Britannica.com
		Get the Top 10 Search Results for "locant "
	www.bonus.com /contour/merriam_webster/http@@/www.m-w.com/dictionary/locant (56 words)

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