%0 Journal Article %T 12-Tungstoboric acid (H5BW12O40) as an efficient Lewis acid catalyst for the synthesis of chromenopyrimidine-2,5-diones and thioxochromenopyrimidin-5-ones: Joint experimental and computational study %A مجید م هروی %A طیبه حسین نژاد %A مهرنوش تمیمی %A Vahideh Zadsirjan %A Mirzaei Shahrabi, Masoud %J Journal of Molecular Structure %@ 0022-2860 %D 2020