scholarly journals Synthesis of Aromatic Polydithioacetals from Aromatic Dithiol and Aromatic Aldehydes by Using Polyphosphoric Acid Trimethylsilyl Ester

1987 ◽  
Vol 19 (11) ◽  
pp. 1303-1307 ◽  
Author(s):  
Masa-aki Kakimoto ◽  
Takuya Seri ◽  
Yoshio Imai
Keyword(s):  
Polyphosphoric Acid ◽  
Aromatic Aldehydes ◽  
Trimethylsilyl Ester

scholarly journals A Facile Solvent Free Synthesis of 3-arylidenechroman-4-ones Using Grinding Technique

2012 ◽  
Vol 9 (3) ◽  
pp. 1251-1256 ◽  
Author(s):  
Suresh Kumar ◽  
Jagdish K. Makrandi
Keyword(s):  
Polyphosphoric Acid ◽  
Cold Water ◽  
Aromatic Aldehydes ◽  
Solvent Free ◽  
Environmentally Benign ◽  
High Yield ◽  
Solvent Free Conditions ◽  
Microwave Irradiations ◽  
Grinding Technique ◽  
Solvent Free Synthesis

An efficient method for the synthesis of 3-arylidenechroman-4-ones has been developed under solvent free conditions using grinding technique. Grinding of variously substituted chroman-4-ones with aromatic aldehydes in presence of anhydrous barium hydroxide at room temperature give 3-arylidenechroman-4-ones in high yield (75-92%). Products are obtained by just acidification of the reaction mixture in ice cold water. Reaction in solid state, with enhanced rate, high selectivity and manipulative simplicity are the attractive features of this environmentally benign protocol. The chroman-4-one derivatives required for the reaction have been obtained by polyphosphoric acid (PPA) catalysed cyclisation of phenoxypropanoic acids under microwave irradiations.

Polyphosphoric Acid Trimethylsilyl Ester (PPSE) in the Synthesis of Heterocycles

ChemInform ◽  
2005 ◽  
Vol 36 (9) ◽  
Author(s):  
Monica E. Hedrera ◽  
Isabel A. Perillo
Keyword(s):  
Polyphosphoric Acid ◽  
Trimethylsilyl Ester
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