Chapter 5.2: Nomenclature of Alkenes Flashcards
Define trans
a prefix meaning across from
Define methylene
a -CH2 group
What letter of the E,Z system specifies that groups of higher priority on the carbons of a double bond are on the same side?
Z
Define E (E,Z system)
specifies that groups of higher priority on the carbons of a double bond are on opposite sides
Define vinyl
a -CH=CH2 group
Define cis
a prefix meaning on the same side
How do you name alkenes according to the IUPAC system?
o To form IUPAC names for alkenes, change the -an- infix of the parent alkane to -en- o According to the IUPAC System Number the longest carbon chain that contains the double bond in the direction that gives that gives the carbon atoms of the double bond the lowest possible numbers Indicate the location of the double bond by the number of its first carbon Name branched or substituted alkenes in a manner similar to alkanes Number the carbon atoms, locate and name substituent groups, locate the double bond, and name the main chain
Why is a E conformation more stable than a Z conformation?
steric strain in Z
Define E,Z system
a system to specify the configuration of groups about a carbon-carbon double bond
What is a -CH2 group?
methylene
How do you name alkenes containing two or more double bonds?
o For alkenes containing two or more double bonds, the infix -en- is changed to -adien-, -atrien-, and so on
What letter of the E,Z system specifies that groups of higher priority on the carbons of a double bond are on opposite sides?
E
How do you name cycloalkenes?
o In naming cycloalkenes, the carbons atoms of the ring double bond are numbered 1 and 2 in the direction that gives the substituent encountered first the smaller number
What is a system to specify the configuration of groups about a carbon-carbon double bond?
E,Z system
What is a prefix meaning across from?
trans
