This work deals with assessing the approach for preparation of cellulose nanoparticles (CNPs) to be acted as synergistic component in liquid crystal (LC) ethyl cellulose composite (EC‐CNPs). In this respect different structures of CNPs were prepared by acid and salt agents. These prepared CNPs were characterized by carboxyl content, IR, transmission electron microscope (TEM), and zeta potential, while their composites with EC were characterized by rheological measurements as a key factor for measuring the critical concentration of LC behavior. The results showed that, the crystallinity of CNPs obtained by ammonium persulfate exceeded that prepared by sulfuric acid hydrolysis. TEM images of stained CNPs showed both methods led to produce nanoparticles have rod like shape with aspect ratio (L/W) between 7.69 ± 3 and 31.3 ± 5. For the rheological measurements, it demonstrated the efficient of incorporating the CNPs to EC (EC‐CNPs composites) to decrease the critical concentration of EC from 40 wt% to approximately 34 wt%.

Thiophosgenation of sulfonamides 1a‐c in the presence of dilute HCl at room temperature furnished the isothiocyanatosulfonamides 2a‐c and treatment with aromatic amines gave 1,3‐disubstituted thioureas 3a,b. Also, interaction of two molecules of 2c with 1,4‐phenylenediamine yielded the novel bisthiourea 4. Cyclocondensation of 2 with ortho amino carboxylic acid compounds such as anthranilic acids 8, 5‐amino‐1‐phenyl‐pyrazol‐4‐carboxylic acid 9 and 4,5,6,7‐tetrahydro‐2‐amino‐benzo[b]thiophene‐3‐carboxylic acid 10 furnished the fused thiopyrimidines 11a‐d, 12 and 13, respectively. 2‐Anilinobenzoazole derivatives 15a‐c, 16a, b and 17a,b were obtained through cyclocondensation of 2 with 1,2‐dinucleophiles.

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Fused pyrimidine derivatives R 0515 Novel Synthesis and Antimicrobial Investigation of Pyrazolo[1,5-a]pyrimidine and Pyrazolotriazine Containing Piperidinyl Sulfone Moiety. -A variety of the title fused pyrazole heterocycles are synthesized using aminopyrazole (IV) as key intermediate. Most of the synthesized compounds exhibit antibacterial activity. -(SALEH, N. M.; AMMAR, Y. A.; MICKY, J. A.; ABBAS, H. A. S.; EL-GABY*, M. S. A.; Indian J.

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