Aromatic Nitration under Neutral Conditions Using Nitrogen Dioxide and Ozone as the Nitrating Agent. Application to Aromatic Acetals and Acylal
作者:Hitomi Suzuki、Shuji Yonezawa、Tadashi Mori
DOI:10.1246/bcsj.68.1535
日期:1995.6
can be nitrated smoothly with nitrogen dioxide in ice-cooled dichloromethane or acetonitrile in the presence of ozone and magnesium oxide to give ortho- and para-nitro derivatives as the major product in good combined yields, the acetal ring as a protective group remaining almost intact. An acylal derived from benzaldehyde similarly undergoes nitration on the aromatic ring to give an isomeric mixture
Synthesis of pinacol acetals catalyzed by (2-carboxyphenyl)diphenylphosphonium bromide
作者:Wenhua Huang、Ning Xu
DOI:10.1080/00397911.2017.1368082
日期:2017.11.17
ABSTRACT (2-Carboxyphenyl)diphenylphosphonium bromide that is readily prepared from commercial 2-(diphenylphosphino)benzoic acid and HBr is an efficient catalyst for the synthesis of pinacol acetals from a variety of aldehydes at room temperature. GRAPHICAL ABSTRACT