2011年6月19日 · Dioxazine, oxathiazine or dithiazine ring systems are seldom found in natural products. One exception is the 1,2,4-dithiazine system, bridged derivatives of which occur in the epithiodiketopiperazine antibiotics.

2005年12月15日 · Dioxazine purple (U14) is an organic optically similar to phthalo blue, but even more absorbing in the visible and less absorbing in the NIR. It is nearly ideal for formulation of dark NIR-transparent layers, but is subject to the chemical stability considerations noted …

2014年12月1日 · Organic perylene black and dioxazine purple are nearly ideal to prepare NIR-transmitting black coatings. However, the high cost of the perylene black prevents the pigmented coating from being a good choice for the building energy efficiency. The coating pigmented with dioxazine purple is a practical cool black coating.

2009年7月1日 · The use of lower energy (16 eV) improved the potential for identification of pigments detection by decreasing fragmentation, but ultimately negative ionization CI was found to be the method yielding the best results for most pigment classes tested, including the monoazo, disazo, quinacridone, dioxazine, and phthalocyanine families.

2024年11月24日 · A rapid and direct route with the help of ultrasound for the synthesis of benzo[1,4,2]dioxazine derivatives through a copper iodide‐catalyzed intermolecular O‐arylation of N‐hydroxyimidoyl chloride and 2‐iodophenol in acetonitrile solvent has been investigated. The use of cheap and available raw materials and catalysts, without column ...

2022年12月15日 · The synthesis of dioxazine pigments involves the reaction of chloranil with a substituted aniline in dichlorobenzene. Chloranil has been previously identified as a source by-product PCBs and so could be a potential source of PCB contamination in dioxazine pigments (Liu et al., 2012). However, congeners found in chloranil do not match those ...

2017年7月6日 · In summary, we have developed an efficient synthetic protocol for the synthesis of 1,2,4-oxadiazine and 1,4,2-dioxazine-6-carboxylate derivatives via 1,3-dipolar (3 + 3) cycloaddition using 2 mol% Cu(OTf) 2 catalyst. The scope of the reaction is wide enough to produce highly functionalized N, O-heterocycles using a variety of diazo esters and ...

2011年1月1日 · Among these, the dioxazine dyes have the greatest industrial importance. Unsulphonated compounds are important pigments. Dioxazine dyes are prepared by the reaction of benzoquinone derivatives, in particular tetrachloro benzoquinone (chloranil) with aromatic amines in presence of an acid binding agent, followed by oxidative cyclisations.

2021年1月1日 · In the next step, the crude dioxazine violet is rinsed by solvent and then by water. Finally, the dioxazine violet crude pigment is obtained after drying around 150 °C. In the long synthesis process, PCDD/PCDFs might form both in the nitration and reduction processes and also in the rinsing and drying processes as shown in Table 4 and Fig. 5 .

1992年1月1日 · The dyes and pigments also contained ng/g levels of hepta-, hexa- and penta congeners. INTRODUCTION Two of the main pigments and dyes, derived from chloranil, which are used in Canada are the dioxazine Pigment Violet 23 and the water soluble dioxazine Direct Blue 106 dye. Diozaxine Direct Blue 108 dye has also a small usage in Canada.