Reaction of Ti(OiPr)4 or Zr(OPr)4 with 1 or 2 molar equiv of the 3-alkyl-substituted acetylacetone derivatives 3-acetyl-6-trimethoxysilylhexane-2-one or 3-acetylpentane-2-one not only gives the corresponding β-diketonate complexes but also results in about 15% hydrodeacylation of the β-diketone. With the stronger Lewis acid Al(OsBu)3 hydrodeacylation prevails. Hydrodeacylation is suppressed when a 1â¶5 ratio of metal alkoxide and β-diketone is reacted.
将Ti(OiPr)4或Zr(OPr)4与1或2摩尔当量的3-烷基取代的乙酰乙酮衍
生物3-乙酰-6-
三甲氧基硅基己烯-2-酮或3-乙酰
戊烯-2-酮反应,不仅生成相应的
β-二酮酸盐配合物,还导致约15%的
β-二酮的氢脱酰化。当使用更强的
路易斯酸Al(OsBu)3时,氢脱酰化占主导地位。当
金属烷氧化物与
β-二酮按1:5的比例反应时,氢脱酰化受到抑制。