Orientation of the minor

To produce a monodomain with respect to the orientation of aU three molecular axes, an additional orientation step is required. If the elastomer is prepared by orienting the major director of a photocrosslinkable polymer in an electric field, one could think about simultaneously orienting the second director by surface effects, e.g., with a rubbed Pl-stuface. For orientation by biaxial desweUing an Sa elastomer, an additional crosslinking step tmder uniaxial strain on the not yet completely crosslinked elastomer could also lead to the orientation of the minor director. 

Such a monodomain has as yet not been produced and it is also not clear whether the orientation of the minor director could be permanently fixed in the polymer network or whether it would relax to a polydomain state after some time. Another question is the behavior after heating to the isotropic phase. 

Since the electrophilic reagent attacks the multiply-bonded nitrogen atom, as shown for (68) and (69), the orientation of the reaction product is related to the tautomeric structure of the starting material. However, any conclusion regarding tautomeric equilibria from chemical reactivity can be misleading since a minor component can react preferentially and then be continually replenished by isomerization of the major component. 

The default (75,302)p grid results in only minor changes in energy between the two molecular orientations. However, the SGI grid s predicted energy is very different for the two orientations of the molecule. 

In Fig. 31.2a we have represented the ith row x, of the data table X as a point of the row-pattern F in column-space S . The additional axes v, and V2 correspond with the columns of V which are the column-latent vectors of X. They define the orientation of the latent vectors in column-space S. In the case of a symmetrical pattern such as in Fig. 31.2, one can interpret the latent vectors as the axes of symmetry or principal axes of the elliptic equiprobability envelopes. In the special case of multinormally distributed data, Vj and V2 appear as the major and minor... 

Any of the motor or autonomic signs, and hypertension and/or nystagmus may occur with any of the minor PCP patterns. Minor patterns should not be diagnosed on physical examination in an emergency department without adequate information about the patient s behavior and sensoriurn prior to admission. Many patients with major patterns may be alert and oriented when they reach the hospital. If no history is available, the patient is kept under observation and rhabdomyolysis is ruled out. 

The two stereoisomers of the bis(r 3-anti),A-trans intermediate 7b confirmed by NMR (References 20, 21) are distinguished by the Irons double bond coordination of opposite enantiofaces. Different from experiment, the major stereoisomer (established by NMR) with a parallel orientation of the trans double bond is predicted to be 0.6 kcal mol 1 (AG) less favorable than the minor stereoisomer with a nonparallel double bond arrangement. 

---