An unprecedented iron complex-catalyzed dehydrogenation of alcohols was achieved using CpFe(CO)2Cl with a base or CpFe(CO)(Py)(Ph) as a catalyst without sacrificing the hydrogen acceptors. This reaction effectively (up to TON 67,000) converted 2-pyridylmethanol derivatives to the corresponding ketones or aldehydes. The mechanistic study is also discussed.
Substituted benzophenones and their liquid mixtures suitable for use as photopolymerisation initiators
申请人:FRATELLI LAMBERTI S.p.A.
公开号:EP0209831A2
公开(公告)日:1987-01-28
As initiators for the photopolymerisation of ethylenically unsaturated compounds, the use of systems consisting of compounds of benzophenone type of formula I
In which R, R' and R2 are preferably alkyls of 1-4 carbon atoms, R3 and R4 are preferably hydrogen and Ar is preferably phenyl, in combination with donors of hydrogen or substances which determine the formation of labile photochemical complexes, such as alcohols, ethers and tertiary amines with hydrogens in the alpha position, and the use for the same purpose of mixtures of 2,4,6- trialkylbenzophenones and benzophenone and particularly of a mixture of 2,4,6-trimethylbenzophenone and benzophenone in a molar ratio of 1.155, which has the advantage of being liquid at temperatures exceeding 10°C and of possessing photochemical activity superior to that of benzophenone.