Showing papers by "Peter G. Jones published in 1979"
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98 citations
TL;DR: It is suggested that a principal component of the illness was heatstroke, brought about by excessive wrapping or warming during a mild infection.
85 citations
TL;DR: The two C-O bond lengths of the acetal group in a series of compounds derived from 2-phenoxytetrahydropyran vary with the aryloxy leaving group, and are linearly related to the free energy of activation for hydrolysis.
Abstract: The two C–O bond lengths of the acetal group in a series of compounds derived from 2-phenoxytetrahydropyran vary with the aryloxy leaving group, and are linearly related to the free energy of activation for hydrolysis.
27 citations
15 citations
TL;DR: In this article, photobis-cyclisation of 1,2,6-triarylpyridinium cations gives 10b-azadibenzo[fg,op]naphthacenium cations and their 2-aza-analogues.
Abstract: Photobis-cyclisation of 1,2,6-triarylpyridinium cations gives 10b-azadibenzo[fg,op]naphthacenium cations (3a–e) and their 2-aza-analogues (3f–c); the structures are supported by X-ray crystallographic analysis of 9-phenyl compound (3f).
12 citations
12 citations
10 citations
TL;DR: In this article, the structure was refined to R = 0.041 for 2520 unique reflexions and the absolute configurations at N(1) and C(4) are S and at C(3)R. CI- is hydrogen bonded to the positively charged N atom.
Abstract: C20H26NO+.C1 -, M r = 347.89, orthorhombic, P212~21, a = 6.004 (4), b = 11.398 (10), c = 28.587 (17) A, U = 1956 A 3, Z = 4, D x = 1.180 Mg m -a, p(Cu Ka) = 1.7 mm-k The structure was refined to R = 0.041 for 2520 unique reflexions. Absolute configurations at N(1) and C(4) are S, and at C(3)R. CI- is hydrogen bonded to the positively charged N atom.
8 citations
8 citations
6 citations
TL;DR: In this paper, the major salt effects observed are consistent with the postulate that the total reaction rate contains separate contributions from free ethoxide ions and metal-ethoxide ion pairs.
Abstract: Kinetic studies (in anhydrous ethanol at 25 °C) are reported for the reactions: RX + MOEt → ROEt + MX where R = Et, X = I, M = Li, Na, or K;, R = 2,4-dinitrophenyl, X = Cl, M = Li, Na, K, or Cs;, and R = 2,4-dinitrophenyl, X = I, M = Li, Na, or K.Measurements were made over a range of metal ethoxide concentrations extending down to 3 × 10–3 mol l–1, so that kinetic behaviour may be compared with conductimetric data for metal ethoxide ‘ion-pair’ association. The major salt effects observed are consistent with the postulate that the total reaction rate contains separate contributions from ‘free’ ethoxide ions and metal–ethoxide ‘ion-pairs’. Additional kinetic complexity arises from: (a) influence of the product salt on the association of metal ethoxides; (b) an effect at higher concentrations which is either a salt effect on the ‘free’ ion + substrate reaction, or which reflects an inadequacy in the assessment of metal ethoxide association from conductimetric data.With ethyl iodide, ‘ion pairs’ are unreactive but with the aromatic substrates both the ‘free’ ethoxide ion and the ‘ion-pair’ react. The observed reactivity patterns are explicable in terms of different transition-state geometries and trends in strengths as electrolytes of metal halides and ethoxides in ethanol.
TL;DR: In this article, the 1H n.m. spectra of a series of 4-substituted derivatives of NN-dimethyl-2-trifluoromethylaniline have been examined.
Abstract: The 1H n.m.r. spectra of a series of 4-substituted derivatives of NN-dimethyl-2-trifluoromethylaniline have been examined; a long range 19F–1H coupling 6J(F,H) between NCH3 and CF3 was confirmed by 19F n.m.r. A linear relation obtains between 6J(F,H) in these compounds and the appropriate Hammett para-substituent constants in accord with the operation of electronic buttressing; a similar correlation holds between the chemical shift of the N-methyl protons and σp.
TL;DR: The structure of the major product from the reaction of bromine on the sodium salt of 7-anti-trimethylsilyl-bicyclo[2.1]hept-5-ene-2-endo-carboxylic acid was elucidated by X-ray crystallography.
Abstract: The structure (4) of the major product from the reaction of bromine on the sodium salt of 7-anti-trimethylsilyl-bicyclo[2.2.1]hept-5-ene-2-endo-carboxylic acid (1) has been elucidated by X-ray crystallography. The structure was solved by the heavy-atom method and refined by least-squares techniques to R 0.050 for 1 340 observed reflections measured by diffractometer. Crystals are monoclinic, space group P21/n, with Z= 4 in a unit cell of dimensions a= 7.011(4), b= 15.344(5), c= 8.537(5)A, β= 99.97(4)°.
TL;DR: In this paper, the CIO~ and formate ions are associated with special positions on twofold axes, the formate being disordered, and the position of the ion is associated with the position on the twofold axis.
Abstract: C 13 HISC1N + . ½CHO 2 . ½C10~, M r = 292.96, orthorhombic, Pbcn, a = 33.258 (10), b = 10.974 (3), c= 7.175 (2) /k, U= 2619 /k 3,Z=8,D x= 1.486Mg m -3, g(Cu Ka) = 3.4 mm -1. R = 0.042 for 1537 unique reflexions. The CIO~ and formate ions are associated with special positions on twofold axes, the formate being disordered.