- Synthesis of Aromatic and Olefinic Sodium Sulfonates by Electrophilic Destannylation with Trimethylsilyl Chlorosulfonate
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A mild and effective method for the preparation of a variety of aromatic, olefinic, and acetylenic sodium sulfonates is described.The reaction of trialkylaryl- (2a-k) and -heteroarylstannanes (4a-d), bis-(1-alkenyl)dibutylstannanes (6a-f), or trialkylakynylstannanes with trimethylsilyl chlorosulfonate (1) followed by hydrolysis with aqueous NaHCO3 provides the sodium sulfonates in an ipso-specific and in the case of vinylic stannanes stereospecific manner.A comparision of the reactivity of stannylated and silylated olefinic compounds 13 and 14 underlines the greater leaving ability of the stannyl moiety.The in situ preparation of the stannanes makes it possible to apply the synthetic method to natural products such as N-substituted apocodeine (17). - Key Words: Electrophilic aromatic substitution/ Electrophilic vinylic substitution/ Trialkylstannanes, application of/ Arylsulfonates, sodium salts of/ Vinylsulfonates, sodium salts of
- Niestroj, Michael,Lube, Andreas,Neumann, Wilhelm P.
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p. 575 - 580
(2007/10/02)
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- Process for dyeing and printing blend fabrics of polyester and natural fibre materials with disperse dye and polyether-polyester to inhibit soilins with disperse dye
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Process for dyeing and printing blended fabrics made from polyester and natural fibre materials, characterized in that the dye baths, padding liquors or printing pastes contain compounds of general formula (I). Dye preparations containing one or more compounds of general formula (I).
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- Mixtures of monoazo dyes: dicyano-nitrobenzene azo compounds
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The invention relates to mixtures of monoazo dyes, which are characterized in that they consist of one or more dyes of the general formula I STR1 and one or more dyes of the general formula II STR2 where R1 is methyl, ethyl, n-propyl or i-propyl, R2 is ethyl or n-propyl, m is 2 or 3 and n is 1 or 2, with the proviso that m+n is 4, processes for preparing same and the use thereof for dyeing and printing hydrophobic fibre materials and blends thereof with natural fibre materials.
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- Process for dyeing and printing synthetic fibers with mixtures of monoazo dyestuffs
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A monoazo dyestuff composition comprising at least two different individual compounds of the formula STR1 wherein R1 and R2, independently of each other, are linear or branched alkyl having 1 to 4 carbon atoms and R is linear or branched alkyl having 1 to 5 carbon atoms, and where said individual compounds differ from each other in at least the R moiety. The monoazo dyestuff mixtures are used for the dyeing and printing of hydrophobic fibers such as high molecular weight polyesters of their mixtures with natural fiber material.
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- Mixtures of monoazo dyestuffs
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The mixture of monoazo dyestuffs which contains one or more dyestuffs of the formula I STR1 and one or more dyestuffs of the formula II STR2 wherein R1 and R2 independently of one another denote linear or branched alkyl with 1 to 6 carbon atoms and R denotes linear or branched alkyl with 1 to 3 carbon atoms, is outstandingly suitable for dyeing and printing hydrophobic materials a deep blue color.
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