01295nas a2200157   4500008004100000245011600041210006900157260000800226300001600234490000700250520068500257100001800942700001600960700002900976856013201005       2016                        eng d00aHighly selective direct azidation of alcohols over a heterogeneous povidone-phosphotungstic solid acid catalyst0 aHighly selective direct azidation of alcohols over a heterogeneo  cDEC  a10240-102450 v403 aA simple protocol for the selective azidation of alcohols is developed using a solid acid hybrid of a povidone and phosphotungstic acid (PVP-PWA) using azidotrimethylsilane as an azide source at room temperature. In a broad substrate scope, various activated as well as unactivated benzylic and diphenyl alcohols were treated smoothly with TMS-N-3 to selectively produce only azide products with excellent yields in a very short reaction time of 2 h. FT-IR confirmed the stability of the catalyst with retention of the Keggins structure after the reaction. Recycling experiments demonstrated the reusability of the PVP PWA (3:1) several times without losing its original activity.1 aKamble, Sumit1 aMore, Sagar1 aRode, Chandrashekhar, V.  uhttps://library.ncl.res.in/content/highly-selective-direct-azidation-alcohols-over-heterogeneous-povidone-phosphotungstic-solid