Abstract An efficient and novel method for thiocyanation of aromatic and heteroaromatic compounds using trichloroisocyanuric acid/ammonium thiocyanate/wet SiO2 is described. GRAPHICAL ABSTRACT
Novel Process for Generating Useful Electrophiles from Common Anions Using Selectfluor<sup>®</sup> Fluorination Agent
作者:Robert G. Syvret、Kathleen M. Butt、Tung P. Nguyen、Victoria L. Bulleck、Ryan D. Rieth
DOI:10.1021/jo020053u
日期:2002.6.1
reaction with Selectfluor electrophilic fluorination agent in acetonitrile solution at room temperature. These generated electrophilic species subsequently react in situ with a variety of aromatic substrates containing one or more substituent groups including H, F, Cl, CH3, COOH, C(O)CH3, NO2, and OR' and NR'R' ' where R' and R' ' are H or CH3. The resulting substitution products are, in most cases
A novel electrophilic thiocyanating reagent, N-thiocyanato-dibenzenesulfonimide, was prepared and exhibited enhanced electrophilicity with a wide scope of substrates. Thus, it reacted with activated aromatics such as phenols, indoles, anilines and anisoles without a catalyst giving the corresponding thicyanate derivatives in high yields, while TfOH for unactivated arenes and hetero aromatics and Zn(OTf)2
Process for generating electrophiles from anions by reaction with electrophilic fluorinating agent
申请人:AIR PRODUCTS AND CHEMICALS, INC.
公开号:EP1138657A1
公开(公告)日:2001-10-04
A process includes substituting a substituent on a substrate. The process includes reacting a salt of an anionic form of the substituent with an electrophilic fluorination agent to provide an electrophile containing a cationic form of the substituent. The electrophile is then electrophilically substituted on the substrate. In some aspects of the process, the substrate can be an aromatic or a non-aromatic. The process can be used for a variety of reactions having electrophilic mechanisms, including halogenation, thiocyanation and nitration.