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Sulfamic acid:An efficient,cost-effective and green catalyst for crossed-aldol condensation of ketones with aromatic aldehydes under solvent-free 被引量:3
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作者 Amin Rostami Firoz Ahmad-Jangi 《Chinese Chemical Letters》 SCIE CAS CSCD 2011年第9期1029-1032,共4页
Aromatic aldehydes undergo crossed-aldol condensation with ketones in the presence of catalytic amount of sulfamic acid (SA) to afford the corresponding α,β-unsaturated aldol products under solvent-free conditions... Aromatic aldehydes undergo crossed-aldol condensation with ketones in the presence of catalytic amount of sulfamic acid (SA) to afford the corresponding α,β-unsaturated aldol products under solvent-free conditions in good to high yields at 45-80 ℃. 展开更多
关键词 ALDEHYDES KETONES crossed-aldol condensation β-Unsaturated aldol Catalyst Sulfamic acid
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Solvent Free Synthesis of α,α-Bis(Substituted-benzylidene)cycloalkanones Using Covalently Anchored Sulfonic Acid on Silica Gel(SiO_(2)-R-SO_(3)H)as an Efficient and Reusable Heterogeneous Catalyst
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作者 Azizollah Habibi Enayatollah Sheikhhosseini +2 位作者 Mohammadali Bigdeli Saeed Balalaie Elinaz Farrokhi 《International Journal of Organic Chemistry》 2011年第4期143-147,共5页
We wish to report a mild and efficient Crossed-Aldol reaction for the synthesis of α, ?-bis(substituted-ben- zylidene)cycloalkanones in the presence of catalytic amounts of covalently anchored sulfonic acid onto sil-... We wish to report a mild and efficient Crossed-Aldol reaction for the synthesis of α, ?-bis(substituted-ben- zylidene)cycloalkanones in the presence of catalytic amounts of covalently anchored sulfonic acid onto sil- ica gel under heterogeneous and solvent-free conditions. The present methodology offers several advantages such as excellent yields, simple procedure and work up steps, short reaction times and easy recovery of the catalyst. We have also demonstrated that the catalyst can be reused successfully. 展开更多
关键词 crossed-aldol Condensation Heterogeneous Catalysis α α-Bis(substituted-benzylidene)cycloalkanones SiO_(2)-R-SO_(3)H Solvent-Free
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