The same analysis as for the aldol reactions can be applied for the addition of crotylboranates to R-chiral aldehydes, since the allyl transfer also proceeds via six-membered chairlike transition states. Z-boronates 93 should therefore yield as the major diastereomer the anti-Felkin adduct 95, while with E-boronates 96 one would expect the Felkin adduct 97 to be preferred (Scheme 30). While this analysis seems to hold in most cases using 96 as the starting boronate (Table 14, entries 1-4), there seems to be no clear picture for the corresponding Z-boronate 93 (entries 5-8).