(Scheme 46, Table 24, entries 7-18). The decisive
control element for (Z)-alkenes160(Scheme 47, Table
25) and disubstituted alkenes163(Scheme 48, Table
26) seems to be again the minimization of 1,3-allylic
strain, as the general turnover of selectivity in
comparison to157suggests. However, a comparison
of entries 1 and 2 in Tables 25 and 26 clearly shows
the limits in trying to rationalize the stereochemical
outcome in cuprate additions as described here.