M-Isomerization

Isomerismus, m. isomerism. iso-metrisch a. isometric, -morph, a. isomor-phous. [Pg.227]

Welter, W., Hartmann, A., and Regitz, M., Isomerization reaction of phospho-ryl-vinyl-carbenes to phosphorylated cyclopropenes, acetylenes, indenes, and 1,3-butadienes, Chem. Ber., Ill, 3068, 1978. [Pg.86]

Kosolapoff, G.M., Isomerization of alkyl phosphites. VII. Reaction with chlorides of singular structure, /. Am. Chem. Soc., 69, 1002, 1947. [Pg.86]

Zappey, H.W. Ingemann, S. Nibbering, N.M.M. Isomerization and Fragmentation of Aliphatic Thioether Radical Cations in the Gas Phase Ion-Neutral Complexes in the Reactions of Metastable Ethyl Propyl Thioether Ions. J. Chem. Soc., Perkin Trans. 2 1991, 1887-1892. [Pg.328]

The principle of proximity which operates in dimer formation predicts that a solid n-alkane with an odd number, m, of carbons should form m-isomeric dimers while an n-alkane with an even number, n of... [Pg.212]

Juskowiak B, Dominiak A, Takenaka S, Takagi M. Isomerization of DNA-bound distilbazolium ligand induced by electron transfer from photoexcited tris(l,10-phenanthroline)Ru(II). Photochem Photobiol 2001 74 391-400. [Pg.242]

Define or identify each of the following terms (a) organic chemistry, (b) total bond order, (c) condensed formula, (d) structural formula, (e) fine formula, (/) hydrocarbon, (g) alkane, (h) aUcene, (/) alkyne, j) aromatic hydrocarbon, (k) saturated, (1) delocalized double bond, (m) isomerism, (n) cycloalkane, (o) radical, (p) functional group, (q) alcohol, (r) ether, (s) aldehyde, (f) ketone, (u) carbonyl group, and (v) ester. [Pg.278]

Downie and Randall (1961) have recently measured the mutarotation of poly-O-acetyl-L-hydroxyproline in formic acid and the reverse mutarotation in Ar,iV -dimethylformamide at various temperatures and polymer concentrations. The activation energy of forward mutarotation was 22.4 kcal/mole and of reverse mutarotation, 23.8 kcal/mole, consistent with a tram- m-isomerization mechanism involving rotation about the peptide bonds. [Pg.27]

Disprop ortionation of m-xylene Al-M Isomerization to other p- and o-xylenes, disproportionation to toluene and trimethyl benzenes were the main reactions. For both reactions, activity increased with increase in the number of pillars. Selectivity for disproportionation increased with decreasing number of pillars due to restricted transition state selectivity. 67 68... [Pg.20]

Reaction calorimetry provides useful insights here even if direct enthalpy of formation measurements are absent. Liquid phase isomerization of the o- to p-tcrt-butylphenol has been shown to be exothermic hy 16.9 1.6 kJ mol [T. N. Nesterova, S. P. Verevkin, T. N. Malova and V. A. Pil shchikov, Zh. Prikl. Khim., 58, 827 (1985) Chem. Abstr., 103, 159918x (1985)] while the p- to m-isomerization in both the Uquid and gas phase is exothermic by ca 1 kJ mol [cf. V. A. Pil shchikov, T. N. Nesterova and A. M. Rozhnov, J. Appl. Chem. USSR, 54, 1765... [Pg.255]

Isomerisation - The influence of aryl substituents upon the photoisomerism of methyl-a-phenylcinnamates has been studied," and reversible tran5,c/j-isomerism of p-methoxycinnamic acid is reported to occur on irradiation in polar solvents. Irradiation of the cinnamides (100) in methanol induces efficient ra 5, m-isomerism. ... [Pg.86]

Chiral tricarbonyl(butadienyl)iron complexes are easily accessible by resolution and show excellent diastereofacial selectivities with a variety of reagents55. The tricarbonyl(trienyl)iron complex 2 and methyl diazoacetate (copper bronze catalysis) give only two cis 7/m -isomeric cyclopropanes 5< These can be separated by column chromatography, and each diastereomer transformed into methyl traits- or 7.r-2-formyl-3.3-dimcthylcyclopropanecarboxylate (hemica-ronic aldehyde) by destructive cleavage of the diene complex auxiliary. The enantiomeric excess in these compounds is above 90%. [Pg.1030]

The geometry optimizations will end with a set of m isomeric structures. Their relative concentrations can be expressed as their mole fractions, w,-, using the isomeric partition functions q. In terms of and the ground-state energy changes AT/q, the mole fractions are given [195-197] ... [Pg.893]

The non-cyclization of these compounds in organic solvents is explained by a fast cw-fra/M-isomerization and the non-planar geometry of these Schiffs bases. [Pg.379]

HOLLOWAY, D. E., YANG, M., PAGANGA, G., RICE-EVANS, C. A., BRAMLEY, P. M., Isomerization of dietary lycopene during assimilation and... [Pg.104]

Kinds of oxide Surface orea (mVg) Highest odd Strength (Ho) Acid omounts (f/mol/m ) Isomerization rate (/Limol/mVmin)... [Pg.521]

Synth, also from (Bu3SnNPh)2S0 with 1- CioHrNCO (25 5), rxn. with MeOH - 1-CinHrNHCONHPh (7 9) (m) Isomeric... [Pg.813]

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