Table 3.

Additions to β-Substituted Acyclic Dienones: Scope^a

entry	allylsilane product	yield (%);b	Z:E c	erd
1e		81	93:7	>99:1
2		81	95:5	99:1
3		75	91:9	>99:1
4		85	89:11	>99:1
5		72	89:11	>99:1
6		73	>98:2	>99:1
7f		69	>98:2	99:1

^aReactions performed under N₂ atm; >98% conv, <2% α,β-unsaturated carbonyl product, and >98% 1,6-addition in all cases.

^bYields of purified products (±5%).

^cDetermined by analysis of 400 MHz ¹H NMR spectra of unpurified mixtures (±2%).

^dDetermined by HPLC analysis; er values correspond to the Z alkene product.

^eReaction time = 6.0 h.

^fPerformed at −50°C for 48 h. See the SI for details.