کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
74035 | 49079 | 2012 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Solvent-free coumarin synthesis via Pechmann reaction using solid catalysts Solvent-free coumarin synthesis via Pechmann reaction using solid catalysts](/preview/png/74035.png)
A solvent-free versatile and efficient methodology, reported here, allows the synthesis of coumarin by hydroxyalkylation of phenols with ethyl or methyl acetoacetate (via Pechmann reaction) using trifluoromethanesulfonic acid (triflic acid) functionalised Zr-TMS (Zr-TMS, zirconia based transition metal oxide mesoporous molecular sieves) catalysts with different loadings of triflic acid over Zr-TMS (5–25 wt.%) where the total acid strength of acid functionalised Zr-TMS material is increased as increasing loading of triflic acid from 5 to 25 wt.% leading to correspond increased higher catalytic activity.
Figure optionsDownload as PowerPoint slideHighlights
► Zr-TMS.
► Triflic acid functionalization.
► Coumarin.
► Pechmann reaction.
► Resorcinol and ethyl acetoacetate.
Journal: Microporous and Mesoporous Materials - Volume 149, Issue 1, 1 February 2012, Pages 1–9