"Transmission of Chiral Information through conjugation."

γ-sulfenyl和-烷氧基底物的strechemical意义是一致的解释，通过定位最电子的供电子基团正交的烯酮面对同时与背面攻击的亲核试剂。虽然背侧攻击可能是简单地诱导的取代基在正交位置的空间体积，我们而不是进步，立体电子起源是更合理的基础上只有一个小的差异之间的苯硫基和甲硫基衍生物，以及与α-烯醛的结果。更重要的是，γ-甲硅烷氧基α-烯酮的立体化学结果与空间论点不一致，因为如果空间起源有效，则背面攻击应受到最大甲硅烷氧基基团的阻碍，导致相反意义的立体选择性。显然，该机制的精确图像将通过处理过渡态而不是基态来绘制。

The streochemical sense of both gamma-sulfenyl and-alkoxy substrates is consistently interpreted by situating the most electron-donating group orthogonal to the enone face concurrent with the back-side attack of the nucleophiles. Although the back-side attack may possibly be induced simply by the steric bulk of the substituent in the orthogonal position, we rather advance that the stereoelectronic origin is more plausible on the basis of only a small difference between the phenythio and methylthio derivatives as well as the results with alpha-enals. More significantly, the stereochemical outcome with gamma-siloxy alpha-enones is not consistent with the steric argument because the back-side attack should be hampered by the largest siloxy group resulting in the opposite sense of the stereoselectivity if the steric origin is valid. Obviously, the precise picture of the mechanism would be drawn by dealing with transition states, not with the ground states.