Methods for selectively protecting the exocyclic amino function of a purine nucleoside are provided using activating agents to effect acylation at the exocyclic amino site. Methods are also provided for recycling polymer bound coupling supports from the reaction mixtures produced upon N-acylation.

 
Web www.patentalert.com

< Thermoplastic elastomer composition and ethylene-.alpha.-olefin copolymer

< Method and apparatus for image forming capable of effectively transferring various kinds of powder

> Method and apparatus for toner image fixing using a sheet-shaped pressing member

> Toner container and air stream delivering mechanism
~ 00066