We present model studies with the one-dimensional model MISTRA to investigate the potential role of frost flowers, recycling on snow, and open leads in the depletion of tropospheric ozone in the Arctic spring. In our model, we assumed frost flower aerosols to be the major source of bromine. We show that a major ozone depletion event can be satisfactorily reproduced only if the recycling on snow...

1. METHOD FOR THE determination of hippuric acid based on the formatioll of a bromine derivative was deScrii)ed by Deniges (1). This bromine derivative has been determined in our laboratory to be Nbromobenzamide. N-bromobenzamide is the hydrolysis and bromination product of hippuric acid, being produced when hippuric acid is subjected to the Hofniann rearrangement, tile first step of which is a...

We have established a simple method for assaying the quantity of soluble bromine in the discharge tubes of an extra-high-pressure mercury discharge lamp. Each discharge tube is destroyed in 5 ml of 10 mM sodium hydroxide, and the recovered sodium hydroxide solution is analyzed by suppressed-ion chromatography using gradient elution. We have clarified that this method can assay less than 1 micro...

THE NEW TYPE OF THE CHEMICAL CASCADE REACTION WAS FOUND formation of cyclopropanes from carbonyl compounds and CH acid by the only bromine direct action. The action of aqueous bromine on the carbonyl compounds and malononitrile in EtOH-H2O solutions in the presence of NaOAc results in the formation of 3-substituted 1,1,2,2-tetracyanocyclopropanes in 48-93% yields. The latter are well-known prec...

The Sn atom in the title salt, (C(7)H(11)N(2))(2)[SnBr(4.67)Cl(1.33)], lies on a center of symmetry within an octa-hedron of disordered halogen atoms. The three independent halogen atoms are each a mixture of bromine and chlorine atoms [with site occupancies for bromine of 0.614 (1), 0.831 (1) and 0.888 (1)]. An N-H⋯ hydrogen bond is present.

The reaction of the ortho-amide 1,1,1-tris-(di-methyl-amino)-4-methyl-4-(tri-methyl-sil-yloxy)pent-2-yne with bromine in benzene, yields the title salt, C15H33BrN3OSi(+)·Br(-). The C-N bond lengths in the amidinium unit are 1.319 (6) and 1.333 (6) Å, indicating double-bond character, pointing towards charge delocalization within the NCN plane. The C-Br bond length of 1.926 (5) Å is characterist...