Substituted amidines (1,2) where prepared from the condensation of benzyl, furfuryl alcohols and ethyl sulphate with thiourea. Chalcone compounds (3,5a and 5b) where also prepared from condensation of 4nitrobenzaldehyde to give compound (3) while acetophenone, 4-hydroxy benzaldehyde and 1,3-dibromopropane gave the diformyl intermediate (4) then it was underwent further reaction with either acetophenone or 4methyl acetophenone to afford compounds (5a,5b) respectively. Condensation of the above amidines with the resulted chalcones or dichalcones afforded the substituted pyrimidines (6-11).Their structures confirmation were studied by IR and were discussed.

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All melting points were uncorrected and measured using Electro thermal melting point apparatus, All chemical were supplied by Aldrich and fluka and BDH companies. Bruker Avance 111 400 MHz was used for 1HNMR measurements. Infrared spectrophotometer model FT (600) CO. LTD (UK) and FT (8400 s) shimadzo were used for IR measurements. power sonic 405 micro process-controlled bench -top ultra-sonic cleaner was used for Ultrasound chemical

The aim of the present study was to prepare a calcium fluoride (CaF2NP) Nano particle which is used in dental composites as dental filling compo glass type. CaF2 Nano powders were prepared using a Co-precipitation method using binary liquid. Crystal Structural characteristics and Elemental composition of (CaF2NP) Nanoparticles were predicted by X-ray diffraction (XRD), which showed crystalline peaks of   this material. Elemental composition was obtained from EDX analysis.  Morphology and diameters of the Nano fibers were studied by scanning electron Microscope (SEM). The size of the particles was also measured from SEM images about 58 ± 21 nm.

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