Addition of trimethylsilyl cyanide to aromatic ketones promoted by organic solutions of lithium salts
作者:Gérard Jenner
DOI:10.1016/s0040-4039(98)02419-8
日期:1999.1
Cyanosilylation of aromatic ketones is strongly promoted in organic solutions of specific lithiumsalts (perchlorate and tetrafluoroborate). Acetonitrile solutions of LiBF4 are safe and efficient media for this reaction.
Nd3+ ions act as a Lewis acid catalyst. In addition, the nanoplates undergo light‐to‐heat conversion when irradiated with NIR light due to cross‐relaxation and nonradiative relaxation processes from excited Nd3+. The cyanosilylation of a series of ketones is performed using the nano‐hotplate catalysts to give near quantitative yields of the cyanohydrin trimethylsilyl ethers. This is because of the high
Regioselective Superacid-Catalyzed Electrocyclization of Diphenylmethyl Cations to Fluorenes, Phenanthrols and Benzofurans
作者:Tomohiko Ohwada、Naohiro Yoshida
DOI:10.1055/s-2001-16083
日期:——
Cationic electrocyclization of α-benzoyldiphenylmethanols in the presence of superacid provides fluorenes, phenanthrols and benzofurans in good to moderate yields. A single substitution leads to regioselective cationic electrocyclizations.