Corn. 720.) 5 P. P. Gaspar and his co-workers have examined the activities of this unknown component and found them to be several times those However, in our unscavenged systems we have found the carrier-free activities of this 7 Samples containing SiH, + PH, and buta-1,3-diene + PH, were simultaneously irradiated. Using the 31SiH, and SCP* specific of the SCP* (personal communication). component approached the SCP* values only when well-conditioned chromatographic columns were employed.
coupling of electronic and nuclear motions, and other nuclear dynamic effects can be assumed to be negligible. It should be emphasized that the same fundamental basis governs the operation of both sets of symmetry rules and in this respect the two sets of rules are fundamentally similar.The examples, given in section IV, show that Wigner-Witmer and Woodward-Hoffmann rules give equivalent results to the extent that total orbital symmetry can be useful but that the Woodward-Hoffmann rules can often provide a further distinction between possible reaction paths by considering individual orbital symmetries as well. The examples include cases where total symmetry is sufficient to analyze a reaction and 5967 also cases where an examination of individual symmetries is required.The hierarchy of symmetry control rests on the occurrence of energy barriers of different heights being encountered, along various reaction coordinates, corresponding to the degree of concordance or discordance of symmetry species from reactant to product wave function structures.The possible experimental observation of "forbidden" processes23•29-33 presages the need to emphasize that these different barrier heights do not control the reaction destiny in an absolute sense but only affect the various probabilities of reaction along different paths. However, for many purposes,14 this degree of reaction control is quite important.
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