Bis-(chloromethyl) oxetane (BCMO) was synthesised from pentaerythritol by chlorination, followed by ring closure. It was polymerised using BF 3 -etherate and butanediol system, similarly the BCMO–THF (tetrahydrofuran) copolymer was also synthesised. The monomers and the polymers were characterised by IR, H-NMR and molecular weight. Flame retardant properties of the poly-BCMO were also investiga...

Composted organic biomasses at 60, 90, and 150 days of maturity were studied for changes in molecular composition. Compost samples were subjected to a mild sequential fractionation based on (1) organic solvent extraction, (2) transesterification with boron trifluoride in methanol (BF3-CH3OH), and (3) methanolic alkaline hydrolysis (KOH-CH3OH). The general chemical variations in compost residues...

boron toxicity usually occurs in arid and saline soils. among all the pollutant'sresource, irrigation water is the most important factor in boron elevating in the soil.modification of boron-rich soils is difficult and in this case, resistant varieties can playan important role in increasing the cultivation in areas with high boron level. to assessthe effects of different concentrations of ...

Chlorine and bromine trifluoride are two of the best known and well-characterized interhalogen compounds. Information about the corresponding iodine compound is rather scarce, probably due to the fact that it is only stable below -30°C [1] and decomposes easily to form I2 and IF5 [1,2]. The three XF3 species have a T-shaped structure of C2v symmetry, consistent with the presence of 10 electrons...

The practice of latent print analysis is comprised a visual examination and the comparison fingerprint pattern from questioned to an exemplar(s). When either smudged or contains little detail, would be considered inconclusive determination. However, in these scenarios, residues (LPRs) could provide associative information supplement current ACE-V (Analysis, Comparison, Examination-Verification)...

The preparation of yttrium metal by the reduction of yttrium trifluoride with calcium is described. Alternate methods employing the formation of a low melting Y-Zn or Y-Mg intermediate alloy are evaluated and data on chemical and microscopic purity of the resulting metal are presented.