Acid mediated deprotection of N-isopropyl tertiary amides
作者:Chris Lorenc、Jonathan T. Reeves、Carl A. Busacca、Chris H. Senanayake
DOI:10.1016/j.tetlet.2015.01.161
日期:2015.3
Tertiary amides containing an N-isopropyl group were selectively deprotected by heating in methanesulfonic acid. The N-isopropyl group was removed selectively in the presence of othergroups on the amide nitrogen such as methyl, primary alkyl, or aryl. The putative isopropyl cation was trapped by Friedel–Crafts alkylation of anisole when the latter was included as a co-solvent.
Methods of making and selling a sunscreen composition
申请人:The C.P. Hall Company
公开号:US20030194384A1
公开(公告)日:2003-10-16
A method of preparing a sunscreen including a solvent system and a filter system, the method including the step of controlling the polarity of the solvent system to control the rate of photodecay of the filter system, as well as sunscreen compositions and compounds for producing sunscreen compositions, are disclosed. A method of selling a cosmetically-acceptable sunscreen composition is disclosed.