Looking for the chemical structures of two reactive dyes: Bezactiv Gelb S-3R 150% and Bezactiv Blau HE-RM 133%

Hello! ... I make some common researches on two reactive dyes: Bezactiv Gelb S-3R 150% and Bezactiv Blau HE-RM 133%. Could you send to me structures of these dyes or at least their IUPAC names and Colour Index names? Thank you very much in advance! I am waiting your answer!

Bezactiv Gelb S-3R is a brand name for a reactive dye, judging from the "activ" in its name. The "Bez" suggests that the manufacturer is Bezema AG, in Switzerland. The correct way to proceed would be to ask the manufacturer what the dye's generic name is. In the absence of information from the manufacturer, we can make guesses, but we can't be sure that they are correct. Fortunately, reactive dyes tend to be referred to more consistently than other dye classes by the same code names, from one manufacturer to another, though this is by no means entirely reliable.

According to an article by Vassileva V., Jeleva J., in the journal Vlákna a textil, volume 12 (4), pages 162–166 (2005), "Bezaktiv S is a group of bifunctional dyestuffs incorporating mono-chlorotriazine and vinyl-sulphone reactive groups in a single molecule." (I found this article online in a PDF of multiple articles.)

A chart at the Textile Knowledge website indicates that Novacron Yellow S-3R, made by Huntsman, may be the same dye as Remazol Ultra Yellow RGB, made by Dystar, and as Dychufix Yellow 3RX, made by Hawelle in China; it seems to indicate that all three of these are reactive yellow 145. The chemical structure of reactive yellow 145 is widely available; here it is from the Chemical Book.com website:

You can see the monochlorotriazine reactive group to the left of the center, in the form of a ring with six nitrogens, and a chlorine attached, while the vinyl sulfone reactive group is on the far left in this structural drawing. The website chemexper.com lists its structural name as 7-[[2-(Carbamoylamino)-4-[[4-chloro-6-[[3-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]amino]1,3,5-triazin-2-yl]amino]phenyl]azo]-1,3,6-naphthalenetrisulfonic acid tetrasodium salt .

I am not at all sure that this is the correct identity for your Bezactiv Gelb S-3R. It is possible that instead Bezactiv Gelb S-3R is the same dye that is referred to by other manufacturers as Reactive Yellow S-3R, such as Cibacron Yellow S-3R and Novacron Yellow S-3R (Novacron is the name that replaced Cibacron when Ciba sold their dye division to Huntsman Textile Effects). The Novacron S dyes have an optimum reaction temperature around 60°C. If this guess is correct, then what you are looking for may be Colour Index Reactive Yellow 205. Like reactive yellow 145, reactive yellow 205 is classified as a bifunctional vinyl sulfone dye. The marketizer.com website lists its structural name as 1,3,6-Naphthalenetrisulfonic acid, 7-[2-[2-[(aminocarbonyl)amino]-4-[[4-[[5-amino-2-[2-[4-(ethenylsulfonyl)phenyl]diazenyl]-4-sulfophenyl]amino]-6-chloro-1,3,5-triazin-2-yl]amino]phenyl]diazenyl]-, sodium salt (1:4) .

I'm unable to find information anywhere on Bezactiv Blau HE-RM. Presumably it is among the HE group of reactive dyes; HE are bifunctional reactive dyes that were introduced under the brand name Procion, and in some cases sold to dye artists among the Procion H line of monochlorotriazine reactive dyes. Unfortunately I cannot locate any reference to a reactive blue HE-RM. I can only recommend you contact Bezema AG, in Switzerland, or find an institution with a subscription to the Colour Index so that you can look it up there, hoping that this dye has been assigned a Colour Index name.

I don't know whether there is any relationship between reactive blue HE-RM and reactive blue HE-R. Sometimes an additional letter in a dye code indicates an entirely new dye molecule, while other times it merely indicates a different dye concentration. Like the other HE dyes, reactive blue HE-R is a bifunctional reactive dye whose two reactive groups are both monochlorotriazines. Its generic name is Colour Index reactive blue 171. The chemical structure as shown at worlddyevariety.com is

The color-producing part of the molecule is shown in the center, with a symmetrical arrangement of the monochlorotriazine sections on either side. If reactive blue HE-RM is not this molecule, it probably has a similar arrangement, with a slightly different chromogen in the middle.

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Posted: Saturday - November 09, 2013 at 11:48 AM

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Looking for the chemical structures of two reactive dyes: Bezactiv Gelb S-3R 150% and Bezactiv Blau HE-RM 133%

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