NOMENCLATURE Flashcards
iupac name=
prefix(side chain)+rootword(main chain)+suffix
suffix is divided into
primary suffix(saturation+unsaturation) secondary suffix(functional group)
what is prefix
it indicates side chains or substituents in organic compound
what is methyl and ethyl
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what is ethenyl
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what is ethynyl
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what is 1-propynyl
SEE STRUCTURES
what is rootword
indicates number of carbons in parent chain
write all the rootwords
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primary suffix
indicates saturation or unsaturation
what is secondary suffix
indicates information about functional group
rule for selecting parent chain
longest possible carbon chain is selected as the parent chain
if a compound has 2 or more chains then
chain with more number of substituents is considered as parent chain
what about unsaturated compounds
chain with max no of unsaturations is considered as parent chain
what about compounds with functional groups
the chain which contains functional group is considered as parent chain
if two identical functional groups are present?
chain which covers both functional groups is called parent chain
which is given most priority in numbering the parent chain
lowest locant rule
what is lowest locant rule
numbering is done such that substituent gets lowest possible number
if 2 or more substituents are present at the same position
numbering is done with lowest sum rule
what about unsaturated compounds
unsaturation gets lowest possible number
if double and triple bond are present at the same distance then
double bond is given more priority
what about compounds with functional groups
functional group gets lowest possible number
if 2,3,4 identical substituents are present in a compound
words like di tri tetra are used
if different substituents are there
follow alphabetical order
IF TWO SUBSTITIUENTS ARE FOUND IN EQUIVALENT POSITIONS
THE LOWER ONE IS GIVEN TO THE ONE COMING FIRST IN THE ALPHABETICAL ORDER
what words are considered in ALPHABETICAL ORDER
ISO AND NEO ARE CONSIDERED WHILE SEC AND TERT ARE NOT CONSIDERED di tri and tetra are not considerd
bis ,tris, tetrakiss words are used when
when two complex compounds are connected to a single carbon atom