By Professor Dr. Paul Heimbach, Dr. Tamás Bartik (auth.)
Considering features of symmetry principles in chemistry, one is confronted with con tradictory phrases as for instance, "90 % concertedness" occasionally getting used in literature. to simply accept conservation of orbital symmetry to be as managed as inversion via replacement ideas turns out way more promising. The purpose of this booklet is aimed toward introducing a qualitative figuring out of part rela tions in electromagnetic interactions. keeping off one-sided dogmatism we attempted to illustrate the significance of different ideas as instructions to the evolution of different order in chemical structures. Passing during the jungle of knowledge it turned extremly vital to manage many times our insights into the ordering phenomena by way of experi ments less than stipulations as coherent as attainable. We grew to become extra conscious of the truth that chemistry - the technological know-how of "becoming" in advanced platforms - can't be understood by way of mechanistic information, i. e. THROUGHPUT-studies by myself, as the mechanism is just precise for the detailed procedure below inves tigation and doesn't provide a device for the evolution of contrary order. We needed to settle for chemistry as a mediator among molecular physics and basic epistemology. This particularly strange mix was once directed by means of excel lent lecturers and the realizations have been made attainable through enthusiastic, open minded coworkers (see references). the following aim we are going to attempt for in this trip may be to quantify the choice ideas, that suggests acquiring the order parameters of H. Haken (e. g. in uneven synthesis).
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Extra info for An Ordering Concept on the Basis of Alternative Principles in Chemistry: Design of Chemicals and Chemical Reactions by Differentiation and Compensation
The multifold combinations of ALTERNATIVES show impressively, that errors in logical typing can not be excluded by oversimplification. 4 The Alternative Principles EVEN/ODD The importance of EVEN 1000 centers is not restricted to 'IT-systems (normally one electron per center) but has an alternative meaning for a-systems, too, proved by the four examples in Fig. 10. The well-known alternation in melting points of hydrocarbons - dependent on the number of methylene groups - is distinctly marked in the clearing points of liquid crystal phases  (example (a».
A '- ___ ~ S / AS S I I [AcJ / +p ~ .... J -I I 4q 14q-1 ~ +p + 2 Fig. 7. Proofs in favour of DOl ACC respectively ACC/DO-phenomena in chemical systems. g. -RI -OR a SI AS control: vide [28,59J "LEFT IRIGHT" propeller arrangements. In Fig. 7 [28,59] we have named the ORDER FACTORS, which perhaps determine the signs of the parameters by choosing the type of central atoms in the substituents. O/S show absolutely and C/Si relatively DOl ACC-behavior towards electrons - always related to the standard carbon - being derived from the first ionization potential (vide Fig.
II ~ I / n") + 8 EF> ~ T"(NM I e 2) 4 M9 CI o =(CH 2 )n @-© 6 rei. , ::l t: 'TI ~ N 1 99 ~ l§;J w :2en eo t: 0- ©f© =. 6 have influence on the energies of AS/S orbitals, which are degenerated in benzene, of lA-substituted benzene-derivatives compared by PE-spectra in Fig. 17. Thereafter the choice of heteroatoms in a-position (C/N 101 F) effects a strong alternation in the energy values of the original "s"-orbital in benzene as standard [68,88-92]. 7) . We investigated the consequences of "ACC"-substituents in the para-positions in diphenyl- and diphenylmethane derivatives both by 13C-NMR-data and by regioselectivities of nitration in the ortho-position of the less substituted aromatic ring (see Fig.