An Ordering Concept on the Basis of Alternative Principles by Professor Dr. Paul Heimbach, Dr. Tamás Bartik (auth.)
By Professor Dr. Paul Heimbach, Dr. Tamás Bartik (auth.)
Considering points of symmetry ideas in chemistry, one is confronted with con tradictory phrases as for instance, "90 % concertedness" occasionally getting used in literature. to just accept conservation of orbital symmetry to be as managed as inversion by way of replacement rules turns out way more promising. The purpose of this booklet is aimed toward introducing a qualitative figuring out of section rela tions in electromagnetic interactions. averting one-sided dogmatism we attempted to illustrate the significance of other ideas as instructions to the evolution of different order in chemical structures. Passing during the jungle of data it grew to become extremly very important to manage time and again our insights into the ordering phenomena via experi ments below stipulations as coherent as attainable. We turned extra conscious of the truth that chemistry - the technological know-how of "becoming" in advanced platforms - cannot be understood by means of mechanistic information, i. e. THROUGHPUT-studies by myself, as the mechanism is simply real for the exact approach below inves tigation and doesn't supply 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 mixture used to be directed via excel lent academics and the realizations have been made attainable by means of enthusiastic, open minded coworkers (see references). the following aim we are going to attempt for in this trip should be to quantify the choice rules, that implies acquiring the order parameters of H. Haken (e. g. in uneven synthesis).
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Extra resources for An Ordering Concept on the Basis of Alternative Principles in Chemistry: Design of Chemicals and Chemical Reactions by Differentiation and Compensation
K + counterions . in (c) an example for alternative regioselectivity (orrho! K +) in the Kolbe-Schmitt synthesis  and in (d) an example for the alternative regioselectivity of a twofold ring closure condensation (trans-! cis-decaline derivative by Li +! K +)  processes « c) and (d» are induced only by the choice of alkali metal counterions. Whether a metalorganic compound with Sp2_ or sp3-hybridized carbon is formed by splitting off a methoxy group. depends only on the counterion Na +IK + .
Finally for the collective crystalline system both the alternative M- and U-conformations are identified without doubt in the bis-keto- and keto-enole-tautomers. The trend is unequivocal in a series of spectroscopic investigations in solution. that the choice of heteroatoms N [107,108]/P [109,110] in the system causes the determining alternative effect. The arrangement LINEAR/TILTED == 180 /90 (END ON /SIDE ON) is proved to be correct for the two examples in (b) [Ill] and . Even in the dimminiation in (c) it is clearly discernible, that the 1,5-dihalo-chinones are "left/right" distorted in the crystal depending on the type of halogen atoms (Br/I) - as 0 0 40 3 Examples of Absolute Orders in Chemical Systems N /" p Is-trans / ® vY R R R~ H N "- /" P Br ~ I CI Br ~ I I @ / @) I c STRAIGHT / (B N = C = "- 'R I G H T .
The insertion of methylene or para-phenylene groups between phosphorus and the representative substituents - when determining Ll- and P-parameters - results in far reaching compensations ofP-parameters and nearly total compensation on the Ll-scale. 5 The Importance of Compensation Phenomena ® COMPENSATIONS IN DATA SETS ',0 tJ. [em -') 0,5 -CHpMe • I -4 -3 .. 3 5 P [em-') ®COMPENSATION IN WITTIG-REACTIONS INSERTION 'OF I-o-IGROUP IDIFFERENTIATED / (TWO) COMPENSATED I M'1I1Ph 4:. /INHIB E I I'\oIIIo~ i R" ..