Marquis reaction

The reaction mechanism has not been elucidated. It is possible that formaldehyde reacts by oxidation as in the Marquis reaction (see formaldehyde — sulfuric acid reagent), whereby colored salts are formed with naphthoquinone sulfonic acid. 

Color reactions are more or less clearly defined reactions of the substances with suitable reagents. Substance-specific reactions are not usually available, e. g. many compounds with aromatic skeletons give both a positive Vitali-Morin reaction [1 -4] and a positive Marquis reaction [4]. Again, numerous aldehydes react with electron-rich compounds in acidic medium to yield colored substances (cf. Chapters 2 and 3.1). 

Maltodextrin 182 Maltose 164,165, 181-184 Mandelin s reagent 426 Manganese cations 144 Manganese(II) chloride reagent 333 Mannitol 409,410 Marking the front 132 Marmesin 67 Marquis reaction 352 Marquis reagent 299 Matacil 107... 

Peroxidases from saliva, crevicular fluid, bacteria, and fungi may contribute to this reaction in caries lesions. Although deeper layers of the carious microflora are assumed to be anaerobic, the oxygen required for the reaction may reach the deeper parts of the plaque via oxygen channels (Marquis, 1995). Lactobacilli, however, cause browning of dentin in the absence of tyrosinase (Dreizen et ah, 1957). 

Marquie, J. and Salmoria, G. and Poux, M. and Laporterie, A. and Dubac, J. and Roques, N. (2001). Acylation and Related Reactions under Microwaves. 5. Development to Large Laboratory Scale with a Continuous-Flow Process. Ind. Eng. Chem. Res., 40, 4485-4490. 

His work on nitration reactions did much to elucidate the mechanism of these reactions, particularly the nitration of aromatic compounds. He became a fellow of the Royal Society in 1924 was knighted in 1958. He was the recipient of many scientific honors medals Refs.-1) World Who s Who in Science, (A G. Debus, Ed), Marquis, Chicago (1968) 2) C ... 

Also, Marquie and co-workers have conducted Friedel-Crafts reactions on a large laboratory scale via a continuous flow process126. They reported the acylation of aromatic ethers and sulphonylation of mesitylene, isolating up to 300 g and 250 g of product, respectively (Schemes 9.13 and 9.14). 

Mark F, Becker U, Herak.J.N., Schulte-Frohlinde D (1989) Radiolysis of DNA in aqueous solution in the presence of a scavenger A kinetic model based on a nonhomogeneous reaction of OH radicals with DNA molecules of spherical or cylindrical shape. Radiat Environ Biophys 28 81-99 Marquis RE, Sim J, Shin SY (1994) Molecular mechanisms of resistance to heat and oxidative damage. J Appl Bacteriol Symp Suppl 76 40S-48S... 

Laporterie A, Marquie J, Dubac J (2002) Microwave-assisted Reactions on Graphite. In Loupy A (ed) Microwaves in Organic Synthesis. Wiley, Weinheim, p 219... 

Colour Tests. Mandelin s Test—yellow Marquis Test—yellow. Thin-layer Chromatography. System TA—Rf 67. (Acidified potassium permanganate solution, weak reaction.)... 

A number of difficulties are associated with colour tests on fresh and dried plant material, in addition to those associated with analysing a primary amine such as mescaline. These include the fact that the plant material itself may obscure the colour reaction that takes place. Furthermore, a wide range of primary phenethy-lamines and amphetamines may yield similar colour reactions. The presumptive test which can be satisfactorily used is the Marquis test (see Appendix 1). Positive and negative control tests should also be carried out. An orange-red colour will develop if mescaline is present. However, due to the difficulties associated with interpretation of such results, further confirmation of the presence of mescaline, by using chromatographic and spectroscopic techniques, is required. 

Laporte, C., Marqui J., Laporterie, A., Desmurs, J.-R., and Dubac, J. 1999. Reactions d acylation sous irradiation micro-onde. II. Acylation d ethers aro-matiques. C. R. Acad. Sci. 455-465. 

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