251_names.txt

start numbering so that all numbers are as small as possible.

Use the longest chain, then pick the one that has the most substituents.

• 1 substituent = no need for number
• 2 substituents = alphabetical order in naming ("iso" yes, "di" no) and priority, use smallest numbers
• 3 substituents = alphabetic order in naming, use smallest numbers

• Use most important one in suffix
• do not use it as a prefix (but start numbering there: 2-methylcyclohexanol).

• relevant for ALKENES and RINGS
• specifies which side of a ring/bond substituents are on

i.e. cis-1-ethyl-3-methylcyclohexane

refers to highest-priority substituents’ sides of the bond.

chloro/hydrogen and iodo/chloro is trans-chloro and Z.

• "bicyclo[L.M.N]xane"
• L and M are non-bridge carbons in rings.
• N is number in bridge.
• x is total carbons.

DO NOT COUNT bridge-connecting carbons in L, M, or N.

two rings which share >1 carbon.

two rings which share one carbon.

For substituents, start counting at bridgehead carbon, onto larger ring, and around biggest ring. Finish while going over bridge, using smallest number possible.

• spiro[L.M]xane
• L and M are non-overlapping carbons in rings (smaller first).
• x is total carbons.

alcohol > alkene > alkyne > [ether / alkyl halide / alkyl group]

CH2=CH2~

CH2=CH-CH2~