Roth studies

J. Roth, Studies on Surface Initiation of Explosives, Stanford Research Institute Technical Report AFWL-TR-65-135. Menlo Park, Calif, 1966. 

Roth et aJ [10] have used CIDNP to study the structures of vinylcyclopropane radical cations fomied from precursors such as sabinene (1). 

Roth H D, Weng H and Herbertz T 1997 CIDNP study and ab initio calculations of rigid vinylcyclopropane systems evidence for delocalized ring-closed radical cations Tetrahedron 53 10 051-70... 

Mazurek M, Benker N, Roth C, Buhrmester T, Fuess H. 2006. Electrochemical impedance and X-ray absorption spectroscopy (EXAFS) as in situ methods to study PEMFC anode. Fuel Cells 6 16-20. 

Schmidt A., Naujoks-Manteuffel C. and Roth G. (1988). Olfactory and vomeronasal projections and the pathway of the Nervus terminalis in ten species of salamanders — a whole mount study employing the horseradish-peroxidase technique. Cell Tissue Res 251, 45-50. 

Histopathological alterations in the brains of rat pups exposed throughout gestation and lactation have also been reported (Hannah and Roth 1991). Some studies found no developmental effects (Hayden etal. 1990a, 1990b Sallenfait et al. 1989). 

Mathews-Roth M. M. and Krinsky N. I. (1970). Studies on the protective function of the carotenoid pigments of Sarcina lutea. Photochem Photobiol 11(6) 419 -28. 

Brodsky M Godbold J., Roth T., Olanow C. (2003). Sleepiness in Parkinson s disease a controlled study. Mov. Disord. 18, 668-72. 

Except for the still thermochemically uninvestigated 1,2-bismethylenecyclopropane44, 57, all bismethylenecycloalkanes can further be divided into two categories—those in which the exo-methylene groups are on adjacent carbons and those further apart. The two isomeric bismethylenecyclobutanes have been studied. Roth presents an enthalpy of formation for the 1,2-isomer, 58, of 204.2 kJmol-1. In the absence of any additional strain-induced destabilization or conjugative/delocalization-induced stabilization, we would expect the disproportionation reaction 27 of methylenecyclobutane (59)... 

Roth gives two values for the enthalpy of formation of 90. We adopt the value from his laboratory for our current study. 

The rate of reaction between hydrocyanic acid (HCN) and acetaldehyde (CH3CHO) to give acetaldehyde cyanohydrin has been studied in a constant-volume batch reactor at 25°C in dilute aqueous solution, buffered to keep the pH constant (Svirbely and Roth, 1953). The reaction is... 

Roth R, Boudet AM, Pont-Lezica R. Lignification and cinnamyl alcohol dehydrogenase activity in developing stems of tomato and popular a spatial and kinetic study through tissue printing. J Exp Bot 1997 48 247-254. 

The reaction between acetone (A) and HCN (B) was studied in aqueous solution (Svirbely Roth, JACS 75 3109, 1953). The tabulated data were... 

CH3COCH3 + HCN . (CH3)2C0.CN.0H, A + B C was studied in aqueous solution (Svirbely Roth, JACS 75 3109, 19531. In one run with initial concentrations of 0.0758 normal for HCN and 0.1164 normal for acetone, the tabulated data were obtained. The equilibrium constant was Ke = 13.87. Find the specific rate. 

Brinker, C.J. Tallant, D.R. Roth, E.P. Ashley, C.S. Sol-gel transition in simple silicates. III. Structural studies during densification. J. Non-Crystalline Solid 1986, 82, 117-126. 

These are not common. An example of a suprafacial shift with inversion of configuration is the thermal rearrangements of bicyclo-hexene, studied by W.R. Roth and A. Friedrich (Tetrahedron Letters 1969, 2607). 

R. A. Provencal, R. N. Casaes, K. Roth, J. B. Paul, C. N. Chapo, R. J. Saykally, G. S. Tschumper, and H. F. Schaefer, Hydrogen bonding in alcohol clusters A comparative study by infrared cavity ringdown laser absorption spectroscopy. J. Phys. Chem. A 104, 1423 1429 (2000). 

D. Spangenberg, P. Imhof, W. Roth, C. Janzen, and K. Kleinermanns, Phenol (ethanol) isomers studied by double resonance spectroscopy and ab initio calculations. J. Phys. Chem. A 103, 5918 5924 (1999). 

Thermochemical and X-ray studies on the simplest 7r-trishomobenzene, cisxisxis-1,4,7-cyclononatriene [8], indicate that this molecule is not homoaromatic (Roth et al., 1964). However, photoelectron spectroscopy clearly demonstrates that there are considerable homoconjugative interactions within [8] (Bischof et al., 1970 Martin and Mayer, 1983). These seemingly contradictory conclusions can be reconciled when it is realized that, using the PES data, the delocalization energy in [8] is estimated to be only about 5% of that in benzene. The manifestations of such a small delocalization energy would be very difficult to detect experimentally by means of NMR spectroscopy. X-ray crystallography, or thermochemistry. 

Barbaralene [85] undergoes a rapid Cope rearrangement with a doublewell potential. The radical cation was studied using CIDNP by Roth (1987) after one-electron oxidation of [85] by y or X-irradiation. On the time-scale of the CIDNP experiment ( 10 8s), a single-minimum potential energy surface was found, i.e. bishomoaromatic structure [156] was suggested. 

Roth also studied the one-electron oxidation product [157b] of 9-methylenebicyclo[4.2.1]nonatriene [157a], It was assumed that the initial oxidation was to [157c] followed by a rapid intramolecular cycloaddition to [157b], The barrier to this addition was estimated at about 5 kcal mol-1. 

---