The yield of inorganic Τ formed in the reaction of recoil Τ atoms with C 6 H 6 and some fluorobenzenes and fluorotoluenes was found to increase with an increasing fraction of F atoms. Absolute product yields for benzene can be calculated on the basis of a 5% T + yield. I 2 decreases the yield of polymeric products by scavenging thermal Τ atoms and preventing the formation of •C 6 H 6 Τ radicals. The T-for-F displacement is almost statistical in i,2,3,5-C 6 H 2 F 4 and C 6 HF S . The relative F/H replacement yield is about 0.3, lower than earlier reported values.
A method involving the combined use of ORD and CD is described by which both the relative and absolute configuration of the two asymmetric centres in amino alcohols, containing only the amino and hydroxyl chromophores, may be determined.
Application of the method to both sedridine and allosedridine (resolved for the first time) is discussed.
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