The present invention relates in a first aspect to a process for hydrogenation of ketones having at least a carbon-carbon double bond in the γ, δ-position to the keto group by hydrogen in the presence of at least one chiral iridium complex having a specific structure and particularly a specific aromatic ligand. It has been shown that this process leads to a strong increase in preferential formation of a single isomer. The process is particularly suitable for the hydrogenation of γ, δ -unsaturated ketones which can be used as flavours and fragrances or for the preparation of vitamin E and its derivatives or of flavours and fragrances.
本发明涉及一种关于酮的氢化过程的第一方面,其中该酮至少在γ、δ位置具有碳-碳双键到酮基团的氢化过程,在至少一种具有特定结构的手性
铱配合物的存在下,通过
氢气进行。特别是一种具有特定芳香
配体的手性
铱配合物。已经证明该过程导致单一异构体的选择性形成大幅增加。该过程特别适用于γ、δ-不饱和酮的氢化,这些酮可用作香精和
香料,或用于
维生素E及其衍
生物的制备,或用于香精和
香料的制备。