Determine the configuration of each of the following alkenes as Z or E as appropriate:(a)...

Determine the configuration of each of the following alkenes as Z or E as appropriate:

(a)

(b)

(c)

(d)

Sample Solution (a) One of the doubly bonded carbons bears a methyl group and a hydrogen. According to the rules of Table 5.1, methyl outranks hydrogen. The other carbon atom of the double bond bears a methyl and a — CH 2OH group. The — CH 2OH group is of higher priority than methyl

.

Higher ranked groups are on the same side of the double bond; the configuration is Z .