Direct anodic (thio)acetalization of aldehydes with alcohols (thiols) under neutral conditions, and computational insight into the electrochemical formation of the acetals
A versatile protocol for the production of acetals/thioacetals by means of direct electrochemical oxidation is developed here under neutral conditions, providing (thio)acetals with good functional group tolerance and a wide scope for both aldehydes and (thio)alcohols. DFT calculations reveal that direct electron transfer from the anode plays a key role in carbonyl activation during this acid free acetalization
An efficient and chemoselective method for preparation of acetals and dithioacetals of aldehydes and their deprotection under catalysis of InF3 is described.
Highly Efficient Regeneration of Carbonyl Compounds from Oximes, Tosylhydrazones, 1,3-Dithiolanes, and 1,3-Dithianes Using Cupric Nitrate Supported on Silica Gel
作者:Jong Gun Lee、Je Pil Hwang
DOI:10.1246/cl.1995.507
日期:1995.7
Cupric nitrate supported in silica gel is exceptionally efficient in regenerating aldehydes and ketonesfrom oximes, tosylhydrazones, 1,3-dithiolanes, and 1,3-dithianes.
4,6-difluorodibenzofuran derivatives of the formula I
the preparation thereof, the use thereof as components in liquid-crystalline media and electro-optical display elements which contain the liquid-crystalline media.
Photocatalytic Reductive Radical‐Polar Crossover for a Base‐Free Corey–Seebach Reaction
作者:Karsten Donabauer、Kathiravan Murugesan、Urša Rozman、Stefano Crespi、Burkhard König
DOI:10.1002/chem.202003000
日期:2020.10.9
abstraction of a hydrogen atom followed by radical reduction. The generated nucleophilic intermediate is then capable of adding to carbonyl electrophiles. The obtained dithiane can be easily converted to the valuable α‐hydroxy carbonyl in a subsequent step. The proposed reaction mechanism is supported by emission quenching, radical–radical homocoupling and deuterium labeling studies as well as by calculated