Advices For Studying Organic Chemistry

1) The number of carbon atoms in each bridge is interposed in brackets in order

of decreasing length.

H 2 C

H 2 C

CH

CH 2

CH 2

HC

CH 2 =

H 2 C

CH

CH 2

HC

=

Bicyclo[2.2.1]heptane Bicyclo[1.1.0]butane
(also called norbornane)

2) Number the bridged ring system beginning at one bridgehead, proceeding first

along the longest bridge to the other bridgehead, then along the next longest

bridge to the first bridgehead.

CH 3

1 2

(^54)
6
7
(^83)
H 3 C
(^123)
4
5
7 6
8
9
8-Methylbicyclo[3.2.1]octane 8-Methy;bicyclo[4.3.0]nonane

4.5 NOMENCLATURE OF ALKENES AND CYCLOALKENES

1. Alkene common names:

H 2 CCH 2 CH 3 CH CH 2 H 3 CC

CH 3

CH 2

IUPAC: Ethene Propene 2-Methylpropene

Common: Ethylene Propylene Isobutylene

4.5A IUPAC RULES

1. Determine the parent name by selecting the longest chain that contains the
   double bond and change the ending of the name of the alkane of identical length
   from -ane to -ene.