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Thermodynamically induced

Acidic hydrolysis of annulated cyclopropanone A,A-acetals 1 gave cxo-aminobicyclo[n.l.O]al-kanols 2. The structure was confirmed on the basis of X-ray analysis and HNMR spectroscopy. A thermodynamically induced isomerization of the primarily formed endo-amino hemiaminal in the presence of acid was shown to be the reason of the formal substitution with inversion of configuration. The corresponding endo-amino diastereomeric hemiaminal 3 was obtained by the reaction of an aminal with water in the presence of a base. ... [Pg.1594]

Methanolysis of a bicyclic aminal gave exo-methoxy AT,0-acetals 4 in the presence of acid, an exo-morpholinobicycloheptanone 0-acetal 5 was obtained due to thermodynamically induced isomerization of the primarily formed product. ... [Pg.1596]

Ballauff M, Wolf BA (1988) Thermodynamically induced shear degradation. Adv Polym Sci... [Pg.201]

To discuss the thermodynamically induced shear degradation in further detail, we first turn to the chemistry of mechanical chain scission. The next step is the comparison of the experimental results with different breakage models according to the method developed in Sect. 3. Then, the dependence of chain scission on various parameters as the applied shear rate, concentration, and temperature will be discussed in detail. [Pg.18]

BallauffM. and Wolf, B. A. Thermodynamically Induced Shear Degradation. Vol. 84, pp. 1-31. [Pg.179]

The liquid-like situation results in thermodynamically induced density and concentration fluctuations, with a tendency toward phase separation and crystallization, which starts via a nucleation step. This can also be used as a technological route to produce unconventional, i. e. inhomogeneous, glasses. Some examples are... [Pg.525]

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