complex[(DIPP-nacnac)CaH·thf]2 1; DIPP-nacnac = CH[(CMe)(2,6-iPr2C6H3N)]2} with the α-hydrogen containing ketones acetophenone, acetone, dibenzylketone and 2-adamantone are smooth. In most cases not only addition but also substantial enolization is observed as a side reaction and in some cases also aldol condensation was found. Despite this unselectivity, the addition products could be isolated crystalline
二聚氢化
钙络合物的反应[(D
IPP-nacnac)CaH·thf]21; D
IPP-nacnac = CH[(CMe)(2,6-iPr2C6H3N)]2} 含α-氢的酮
苯乙酮、
丙酮、二苄基酮和2-
金刚酮是光滑的。在大多数情况下,不仅观察到加成反应,而且观察到大量烯醇化作为副反应,并且在某些情况下还发现了羟醛缩合。尽管有这种非选择性,加成产物仍可以是结晶纯的。[(D
IPP-nacnac)CaOCH(Me)Ph]2 (3), [(D
IPP-nacnac)CaOCH(CH2Ph)2]2 (6) 和 [(D
IPP-nacnac)Ca(2-adamantoxide)] 的晶体结构2 (7) 已确定。氢化
钙络合物1是酮氢化
硅烷化的有效催化剂。独立于
硅烷/酮比例,观察到形成双烷氧基
硅烷 [PhSiH(OR)2] 的强烈偏好。在大多数情况下,在产品中没有发现烯氧基。这表明该机制不涉及向酮官能团添加氢化
钙