A. As ring strain increases, what occurs to the C=C stretching with ENDO double bonds (double bond inside a ring)? What is the exception to this rule?
B. Where does cycloheptene and cyclohexane C=C strech absorb? What does this absorbtion decrease as the ring with the ENDO double bond gets smaller?
C. What if the ENDO double bond is at a ring fusion?
D. What occurs to this cyclic ENDO double bond as it is conjugated with alkyl groups?
A. C=C stretching frequency decreases. Cyclopropene is the exception.
B. Cycloheptene and cyclohexene C=C at about 1650 cm-1, all others decreased by ~35 cm-1
C. It is the equivalent of a ring with one less carbon (i.e. decreases frequency)
D. Wavenumber will increase.