Decomposition of osmium tetroxide in alkaline solution by gamma-rays

Abstract

Der G‐Wert der radiochemischen Reduktion von OsO4 (etwa 1 mmol/l) in 0.03 M NaOH wird zu 1.11 +/‐ 0.05 bestimmt, er ist in weitem Bereich praktisch unabhängig von der OsO4‐ (0.6 bis 5.6 mmol/l) und NaOH‐Konzentration (0.03‐0.06 mol/l).

Toluene Dioxygenase‐Catalyzed Synthesis of cis‐Dihydrodiol Metabolites from 2‐Substituted Naphthalene Substrates: Assignments of Absolute Configurations and Conformations from Circular Dichroism and Optical Rotation Measurements

“…260-270 nm; for 1,2-dihydronaphthalene in hexane solution this transition appears at 258 nm (e = 9070). [38] Almost forty years ago, CrabbØ postulated an empirical helicity rule for the styrene chromophore, which correlates the sign of the 260-270 nm transition Cotton effect with the helicity: that is, the sign of the torsion angle g (Scheme 2). According to this rule, an M helical styrene chromophore (g < 0) is characterized by a positive Cotton effect, and conversely, a negative Cotton effect is associated with P helicity (g > 0) of the styrene chromophore.…”

“…The characteristic electronic π–π* transition involving the orbitals of both the benzene and the ethylene part of the styrene chromophore is located in the electronic spectra at ca. 260‐270 nm; for 1,2‐dihydronaphthalene in hexane solution this transition appears at 258 nm ( ε =9070) 38. Almost forty years ago, Crabbé postulated an empirical helicity rule for the styrene chromophore, which correlates the sign of the 260–270 nm transition Cotton effect with the helicity: that is, the sign of the torsion angle γ (Scheme ).…”