Stereoisomers naming double bonds

Write structural formulas or build molecular models and give the lUPAC names for all the alkenes of molecular formula C6H12 that contain a trisub stituted double bond (Dont forget to include stereoisomers)... 

Isomeric alkenes may be either constitutional isomers or stereoisomers There is a sizable barrier to rotation about a carbon-carbon double bond which corresponds to the energy required to break the rr component of the double bond Stereoisomeric alkenes are configurationally stable under normal conditions The configurations of stereoisomeric alkenes are described according to two notational systems One system adds the prefix CIS to the name of the alkene when similar substituents are on the same side of the double bond and the prefix trans when they are on opposite sides The other ranks substituents according to a system of rules based on atomic number The prefix Z is used for alkenes that have higher ranked substituents on the same side of the double bond the prefix E is used when higher ranked substituents are on opposite sides... 

This system of identifying double-bond stereoisomers is very limited, because you need two groups that are the same to use the cis/trans system of naming. So what do you do if you have four different groups on a double bond There are still two possible stereoisomers ... 

Write structural formulas for two alkenes of molecular formula C7H14 that are stereoisomers of each other and have a trisubstituted double bond. Give systematic names for each. 

Dienes and trienes are named according to the IUPAC convention by replacing the -ane ending of the alkane with -adiene or -atriene and locating the positions of the double bonds by number. The stereoisomers are identified as E or Z according to the rules established in Chapter 5. 

This chapter begins with a discussion of a type of stereoisomer that arises because of the presence of a carbon-carbon double bond in a compound. Then a method to distinguish these stereoisomers when naming them is presented. This is followed by a discussion of the various shapes that molecules can assume by rotating about their single bonds. 

Draw all stereoisomers having molecular formula CeHia that contain one double bond and a five-carbon chain with a one-carbon branch. Name each compound, including its E,Z or R,S designation when necessary. 

E,Z System of nomenclature (Section I0.3B) A system for unambiguously naming alkene stereoisomers by assigning priorities to the two groups on each carbon of the double bond. The E isomer has the two higher priority groups on opposite sides of the double bond, and the Z isomer has them on the same side. 

The two compounds, referred to as cis-trans (or geometrical) stereoisomers, are distinguished by using the prefixes cis- and trans- before the lUPAC name. Cis refers to the isomer where the two similar groups (hydrogens or methyls in this case) are on the same side of the double bond. The trans isomer has the two similar groups on opposite sides of the double bond. 

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