93465-43-1Relevant articles and documents
Stereochemical Studies by PMR Spectroscopy: Configurational Assignment of Tricyclo2,5>deca-3,9-diene-7,8-dicarboxylic Anhydride
Verma, S. M.,Verma, Ashok K.
, p. 639 - 642 (2007/10/02)
Stereochemistry of the title compound (II) has been assigned through conformational analysis about the N-N and N-S (sp2) bonds by transforming the anhydride (II) into its hydrazide and imide derivatives.The characteristic resonance patterns demonstrate the endo-cis-endo-geometry of the molecule, i.e. both the cyclobutene and the anhydride rings are towards the cage olefinic bond.The 3,4-double bond of the compounds IIIa,b, IVa,d and Vd has been selectively reduced , and the spectral analyses of the reaction products further substantiate the proposed geometry.A preferred anti-orientation about the aryl C(2)-O bond, in the syn-conformation about the N-C(sp2) bond, in ortho-anisylamide derivatives, has been demonstrated.