CHEM 3311 - Unit 2

stereoisomers

same MF, same atomic connectivity, diff 3D arrangements

why cant you rotate stereoisomers

will break the pi bonds

what makes a molecule capable of having stereoisomers

different atoms on top and bottom of connecting molecule

vinyl

allyl

rules for naming alkenes

principal chain - chain w most double bonds, alkene carbons get lowest #

name for highest priority (largest mass) atom on same size

Z - zusammen “together”

name for highest priority (largest mass) atom on diff sides

E - entgegen “across”

how do you determine E or Z if sides are the same?

compare atom of higher mass, if same continue process

duplication rule

if double bond - add atom to both sides

triplication rule

if triple bonded - add atom to both sides twice

does stability increase or decrease when the amt of R groups increases

increases

does the type of R group matter when considering stability?

no, all the same

why do more R groups make an alkene more stable?

partial positive charges (orbitals) and therefore the induction effect