Hypervalent Iodine Oxidation of Allenes: Synthesis of 3-Acetoxy-3-alkoxypropynes, 2-Alkoxy-3-tosyloxypropanals and Phenyl-Substituted Propenals and Propenones
The invention relates to a new polyisocyanate composition for producing coatings, said composition comprising at least one monophenol alkyl compound, a mixture of phosphite compounds for preventing yellowing and/or precipitation of the composition, and optionally, a catalyst.
Hypervalent Iodine Oxidation of Allenes: Synthesis of 3-Acetoxy-3-alkoxypropynes, 2-Alkoxy-3-tosyloxypropanals and Phenyl-Substituted Propenals and Propenones
作者:Robert M. Moriarty、Thomas E. Hopkins、Radhe K. Vaid、Beena K. Vaid、Stuart G. Levy
DOI:10.1055/s-1992-26244
日期:——
1-Alkoxyallenes yield 3-acetoxy-3-alkoxypropynes upon oxidation with [(diacetoxy)iodo]benzene at - 78°C in dichloromethane. Treatment with [hydroxy(tosyloxy)iodo]benzene under similar conditions gives 2-alkoxy-3-tosyloxypropanals. Phenyl-substituted propenals and propen-1-ones are obtained from the treatment of phenyl-substituted alienes with [hydroxy(tosyloxy)iodo]benzene in dichloromethane at - 78°C.