# What are the rules for writing condensed structural formulas?

Jul 29, 2015

Condensed structural formulas are designed to be typed on a single line. Here are the rules.

#### Explanation:

• Write the atoms of the longest chain horizontally in the order in which they are connected.
• You may combine repeating horizontal units in subscripted parentheses.
• Write all of the ligands on an atom immediately to its right, with subscripts for multiples.
• Exception: Write ligands on the leftmost atom immediately to its left.
• Enclose polyatomic ligands in parentheses.
• Use explicit bonds as needed to clarify attachments.
• It is preferable to treat equivalent groups equally.

Here are some examples of condensed structural formulas.

${\text{CH"_3"CH"_2"CH"_2"CH"_2"CH"_2"CH}}_{3}$ and ${\text{CH"_3("CH"_2)_4"CH}}_{3}$

("CH"_3)_4"C"

("CH"_3)_2"CHC(CH"_3)_2"CH"_2"CH"_3

${\text{CH"_3"CCl"_2"CH"_2"CH}}_{3}$

$\text{HOCH"_2"CH"_2"OH}$

${\text{CH"_3"COCH}}_{3}$ and ${\text{CH"_3"C(=O)CH}}_{3}$ and ("CH"_3)_2"C=O"

$\text{ClCH"_2"COOH}$ and $\text{ClCH"_2"C(=O)OH}$

$\text{CH"_3"CH"_2"C≡N}$ and $\text{CH"_3"CH"_2"CN}$

"CH"_3"CON(CH"_3)_2 and "CH"_3"C(=O)N(CH"_3)_2

"CH"_3"CH(COOCH"_3)_2

${\text{CH"_3"CH(OH)CH}}_{3}$