93007-83-1Relevant academic research and scientific papers
Triggering effect caused by elemental sulfur as a mean to reduce the polymerization temperature of benzoxazine monomers
Arza, Carlos Rodriguez,Froimowicz, Pablo,Ishida, Hatsuo
, p. 35144 - 35151 (2016/05/19)
Mixtures of different benzoxazine resins and elemental sulfur (S8) are prepared and then reacted at 120 °C, below the temperature for radical formation of sulfur. The progress of the reaction and the chemical structures of the main products are monitored and characterized by proton nuclear magnetic resonance spectroscopy (1H NMR) and Fourier transform infrared spectroscopy (FT-IR). Thermal analysis of all reactive systems are also performed and studied by differential scanning calorimetry (DSC). The introduction of S8 into benzoxazines generates a new structure bearing a Schiff base and a phenolic -OH within the reactive system, which then triggers the reduction of the polymerization temperature in about 15% when as low as 5 mol% of S8 is added.
One pot synthesis of [1,3]-oxazine and [1,3]-thiazine derivatives under thermal and microwave conditions
Tumtin,Phucho,Nongpiur,Nongrum,Vishwakarma,Myrboh,Nongkhlaw
experimental part, p. 125 - 130 (2010/04/05)
(Chemical Equation Presented) A simple and efficient synthesis of substituted benzo [1,3] oxazine and benzo [1,3] thiazine derivatives under conventional heating, as well as microwave irradiation is reported. The compounds were obtained by the reaction of electron rich phenols, formaldehyde, and aromatic amines in methanol. Reactions which take 12-16 hr under conventional heating were successfully completed within a few minutes under microwave irradiation (solventless) with moderate to excellent yields.
An eco-friendly synthesis and antimicrobial activities of dihydro-2H-benzo- and naphtho-1,3-oxazine derivatives
Mathew, Bijoy P.,Kumar, Awanit,Sharma, Satyasheel,Shukla,Nath, Mahendra
experimental part, p. 1502 - 1507 (2010/06/14)
A series of 3,4-dihydro-2H-benzo[e]-, 2,3-dihydro-1H-naphtho[1,2-e]-, 3,4-dihydro-2H-naphtho[2,1-e][1,3]oxazine and 1,2-bis(3,4-dihydrobenzo[e][1,3]oxazin-3(4H)-yl)ethane derivatives was obtained through an eco-friendly Mannich type condensation-cyclization reaction of phenols or naphthols with formaldehyde and primary amines in water at ambient temperature. Preliminary in vitro antimicrobial activity of the synthesized compounds was assessed against six pathogenic fungi, two Gram-negative and two Gram-positive bacteria. Some of the screened compounds have shown significant in vitro antimicrobial effect. Cytotoxic activities of the lead compounds (2m, 2n, 3c and 3d) against mouse fibroblast cell line (L929) were determined by MTT method. The assay results revealed that these molecules offered remarkable viability (>90%) of L929 cells at concentration of 25?μg/mL.
