Tudos

B. Pukanszky and F. Tudos, Makromol Chem. Macromol Symp, 38, 205 (1990). 

Schasfoort, R.B.M. and Tudos, A.J. (2008) Handbook of Surface Plasmon Resonance, Royal Society of Chemistry., Cambridge. 

M. Iring, Zs. Laszlo-Hedvig, F. Tudos and T. Kelen, Polym. Degrad. Stab., 467 (1983) 5. 

A.J. Tudos, G.A.J. Besselink, and R.B.M. Schasfoort, Trends in miniaturized total analysis systems for point-of-care testing in clinical chemistry. Lab on a Chip 1, 83-95 (2001). 

M Iring, T Kelen, F Tudos, ZS Laslo-Hedvig. J Polym Sci Polym Symp 57 89-99, 1976. 

Thiourea dioxide (TUDO, HN=C(NH2)S(0)0H)/Na0ff 23.23 Hydride transfer reagents... 

The use of sodium dithionite (Na2S204) and thiourea dioxide (TUDO HN=C(NH2)S(0)0H) has been introduced later as a reducing agent for the preparation of sodium telluride in an aqueous medium, followed by reaction with n-alkyl halides to give dialkyl teUiirides. - ... 

The TUDO method has been reinvestigated and has found wide use because of the simplicity of the experimental conditions. 

Dialkyl tellurides (general procedure) A mixture of TUDO (0.2 g, 2 mmol), NaOH (0.112 g, 2.6 mmol), Te powder (0.128 g, 1 mmol) in H2O (0.75 mL) and THF (0.75 ml) is refluxed for 1 h. The alkyl halide (2 mmol) and (cetyl trimethyl ammonium bromide) CTBA (0.004 g, 1.1 X 10 mmol) in THF (0.5 mL) are added to the pale pink solution. After 1 h of additional reflux the mixture is worked up in the usual manner and the residue purified by column chromatography on Si02 (elution with petroleum ether 40-60°C). 

The tellurolate anion formed can be alkylated in situ, giving alkyl aryl tellurides, if the above reaction is effected in the presence of a phase transfer catalyst. Otherwise, performing the reaction in the presence of the reducing agent TUDO a telluride yield near to quantitative is generated, owing to the reduction of the aryl tellurinate anion to aryl tellurolate. ... 

The most employed redncing agents in the old tellurium chemistry were alkali sulphites or hydrogen snlphites, methylmagnesinm iodide and sodinm snlphide hydrate. The last reagent is still nsed, together with the more recently introdnced sodium borohydride, TUDO, hydrazine, samarinm diiodide and sodium ascorbate. ... 

With TUDO (general procedure). A mixture of diorganyltellurium dihalide (2 mmol) and 2 N NaOH (10 mL) is stirred at room temperature for 15 min. TUDO (0.432 g, 4 mmol)... 

Kelen and Tudos [1975] refined the linearization method by introducing an arbitrary positive constant a into Eq. 6-37 to spread the data more evenly so as to give equal weight to all... 

Even with the Kelen Tudos refinement there are statistical limitations inherent in the linearization method. The independent variable in any form of the linear equation is not really independent, while the dependent variable does not have a constant variance [O Driscoll and Reilly, 1987]. The most statistically sound method of analyzing composition data is the nonlinear method, which involves plotting the instantaneous copolymer composition versus comonomer feed composition for various feeds and then determining which theoretical plot best fits the data by trial-and-error selection of r and values. The pros and cons of the two methods have been discussed in detail, along with approaches for the best choice of feed compositions to maximize the accuracy of the r and r% values [Bataille and Bourassa, 1989 Habibi et al., 2003 Hautus et al., 1984 Kelen and Tudos, 1990 Leicht and Fuhrmann, 1983 Monett et al., 2002 Tudos and Kelen, 1981]. 

Some effect of viscosity on r has been observed [Kelen and Tudos, 1974 Rao et al., 1976]. Copolymerization of styrene (Mil-methyl methacrylate (M2) in bulk leads to a copolymer containing less styrene than when reaction is carried out in benzene solution [Johnson et al., 1978]. The gel effect in bulk polymerization decreases the mobility of styrene resulting in a decrease in r and an increase in r%. 

---