The relative reactivities of representative α- and β-heterosubstituted acyclic, cyclic (five- and six-membered), and aromatic ketones with the lithium enolate of pinacolone in diethyl ether at -78 o C were determined. The order of reactivitiesof monosubstituted acetones (MeCOCH 2 X) is X=Cl>OTBDMS>OMe>SMe>NMe 2 >CH 2 SM>H>Me and spans a range of 10 4
测定了代表性的 α- 和 β- 杂取代的无环、环状(五元和六元)和
芳香酮与
频哪酮的烯醇
锂在 -78 o C 的二
乙醚中的相对反应性。单取代
丙酮 (MeCOCH 2 X) 的反应性顺序为 X=Cl>OTB
DMS>OMe>SMe>NMe 2 >CH 2 SM>H>Me,范围为 10 4