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Lowest sum rule - iupac system of nomenclature
previously it may be noted that, the numbering of the parent chain consisting of two or more substituents was done in such a way that sum of the locants is the lowest. This rule is known as lowest sum principle. For illustration, the carbon chain of alkanes illustrated below should be numbered as pointed out in structures A and not as per to structure B.
A or correct Sum of locants =3+4=7
B or wrong Sum of locants =4+5=9
As per to latest IUPAC system of nomenclature, the lowest set of locants is preferred even if it violates the lowest sum rule. For instance,
This compound is numbered like 2, 7, 8 and not as 3, 4, 9 in accordance along with latest lowest set of locants rule, although it violates lowest sum rule.
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