Table 2.

Effect of Ligand Structure on Stereoselectivity with E-Crotyl–B(pin)^a

entry	G	time (h); conv (%)b	α:γb	Z:Eb	yield (%)c	erd
1	SiPh3 (ap-3)	24; >98	>98:2	>98:2	86	91:9
2	t-Bu (ap-4)	24; >98	>98:2	97:3	84	93:7
3	H (ap-5)	24; 71	>98:2	96:4	60	89:11

^aReactions were carried out under N₂ atm.

^bDetermined through analysis of ¹⁹F NMR spectra of the unpurified product mixtures (±2%).

^cYields are for isolated and purified α-addition products (±5%).

^dEr was determined through HPLC analysis (±1%). See the Supporting Information for details.