Trifluoromethyl ethers R-OCF3 are easily synthesized from the corresponding dithiocarbonates R-OCS2Me (R = aryl or primary alkyl) by a reagent system consisting of 70% HF/pyridine and an N-halo imide. When the reaction is applied to R-OCS2Me wherein R = secondary alkyl, tertiary alkyl, or benzylic group, fluorination leading to the corresponding alkyl fluorides R-F is achieved, whereas a combination
Highly Efficient Iridium-Based Photosensitizers for Thia-Paternò–Büchi Reaction and Aza-Photocyclization
作者:Jian He、Zhi-Qin Bai、Pan-Feng Yuan、Li-Zhu Wu、Qiang Liu
DOI:10.1021/acscatal.0c05005
日期:2021.1.1
applying photocatalytic systems to activate substrates becomes increasingly popular. Although photosensitizers serve as the core of the photocatalytic reaction, the design of a photosensitizer has not been taken for granted. By modifying ligands of organometallic complexes to optimize properties of photosensitizers, we successfully achieved a series of iridium complexes with long excited triplet-state lifetime
1,3-Elimination with rearrangement during ester pyrolysis. A simple route to protoadamantene and 2,4-didehydroadamantane
作者:J. Boyd、K. H. Overton
DOI:10.1039/p19720002533
日期:——
Pyrolysis of 2-adamantyl methane- or toluene-p-sulphonate (16) affords a mixture (2 :3) of protoadamantene (17) and 2,4-didehydroadamantane (18) in 95% yield. Hydroboration of (17) gives a mixture of 4-[(20), (21)] and 5-[(24), (25)] protoadamantanols. Epoxidation of protoadamantene gives a mixture (6 : 1) of the exo-(26) and endo-(27), epoxides the former rearranging spontaneously to 2a,4a-dihydroxyadamantane