Alkoxyhydrosilanes as Sources of Silylene Ligands: Novel Approaches to Transition Metal–Silylene Complexes
作者:Takahiro Sato、Masaaki Okazaki、Hiromi Tobita
DOI:10.1246/cl.2004.868
日期:2004.7
Irradiation of Fe(CO)5 and HSiMe2OR (R = alkyl or aryl group) together with hexamethylphosphoric triamide (HMPA) produces (CO)4Fe=SiMe2·HMPA and SiMe2(OR)2. Even in the absence of HMPA, irradiation of Fe(CO)5 and HSiMe2O(2-C5H4N) affords (CO)3(H)FeSiMe2···O(2-C5H4N)···SiMe2}. In these reactions, the alkoxyhydrosilanes act as sources of the silylene ligand.
Rhodium-catalyzed decomposition of alpha-vinyldiazoesters in the presence of silanes, alcohols, ethers, amines, and thiols have been shown to produce the corresponding alpha-silyl, alpha-hydroxy, alpha-alkoxy, alpha-amino, and alpha-thioalkoxy esters in generally good yield with a complete retention of the stereochemistry of the double bond of the diazo precursor. An extension of the process in homochiral series has also been devised using either a chiral auxiliary attached to the ester function or achiral alpha-vinyldiazoesters and Doyle's chiral catalyst Rh-2(MEPY)(4). In the former approach, pantolactone as chiral auxiliary gave diastereoselectivities of up to 70%, while the second approach produced the desired allylsilane with ee as high as 72%. On the other hand, Rh-2(MEPY)(4)-catalyzed insertion into the O-H bond of water led to poor or no enantioselectivity in good agreement with recent literature reports.
Nikolaev,G.A. et al., Journal of general chemistry of the USSR, 1977, vol. 47, p. 106 - 109
作者:Nikolaev,G.A. et al.
DOI:——
日期:——
Moiseichuk, K. L.; Livshits, F. Z.; Yuvchenko, A. P., Journal of general chemistry of the USSR, 1992, vol. 62, # 8, p. 1498 - 1501
作者:Moiseichuk, K. L.、Livshits, F. Z.、Yuvchenko, A. P.、Tychinskaya, L. Yu.、Dikusar, E. A.、Efimova, L. A.
DOI:——
日期:——
PHOTOACID GENERATOR, AND PHOTOSENSITIVE COMPOSITION USING SAME
申请人:SAN-APRO LTD.
公开号:US20240027901A1
公开(公告)日:2024-01-25
Provided are: a photoacid generator that effectively generates acid even when a substance such as a colorant which attenuates or blocks radiated light is present at a high concentration, the film thickness thereof is large, and a light source is visible light to infrared light, particularly infrared light having low energy; and a highly curable photosensitive composition using the photoacid generator. The present invention is a photoacid generator that is a metal complex having, as a ligand, a ring structure formed by bonding five-membered ring aromatic heterocyclic compounds directly or by π-conjugation, wherein a central metal has one or two axial ligands, and the axial ligand has an onium salt structure.