title: Ultrasound promoted synthesis of some novel fused pyrans.
abstract: Novel fused pyrans were synthesized from the reaction of the tetrahydropyran-4-one with arylidine malononitriles. Different fused pyran derivatives were obtained from the mentioned reaction depending on type of catalyst used and type of energy used. Reactions were carried out under silent and ultrasonic conditions. In general, it was found that sometimes ultrasound irradiations change the reaction path in comparing with silent condition. In addition to improvement in reaction times, the products were obtained in high yields and their structures were determined by elemental analyses, spectral data.
authors: Green Chemistry Department, National Research Centre, Dokki, Cairo 12622, Egypt. tamsaid@yahoo.com
authors: Tamer S
authors: TS
authors: Saleh
authors: Naglaa M
authors: NM
authors: Abd El-Rahman
authors: Ahmed A
authors: AA
authors: Elkateb
authors: Nehal O
authors: NO
authors: Shaker
authors: Naema A
authors: NA
authors: Mahmoud
authors: Shimaa A
authors: SA
authors: Gabal
mesh_terms: D019220:High-Energy Shock Waves; D009570:Nitriles / Q000737:chemistry* / Q000528:radiation effects*; D011714:Pyrans / Q000138:chemical synthesis* / Q000528:radiation effects*; D011829:Radiation Dosage; D013010:Sonication / Q000379:methods*
chemical_list: D009570:Nitriles; D011714:Pyrans; C000945:dicyanmethane