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Synthesis and 1H NMR spectrum of N6′,N9-octamethylenepurine cyclophane

✍ Scribed by Russell A Bell; Howard N Hunter

Book ID
104227347
Publisher
Elsevier Science
Year
1987
Tongue
French
Weight
236 KB
Volume
28
Category
Article
ISSN
0040-4039

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✦ Synopsis

N6',N9-Octamethylenepurine cyclophane, 1 ,has been synthesized by intramolecular cyclization. Its pmr spe7trum shows all 16 methylene protons to be resolved, their chemical shifts ranging from -0.6 to +4.8 ppm. Much interest has been expressed in the chemical shift effects of the aromatic purine and pyrimidine heterobases present in ribo-and deoxyribooligonucleotides'. These highly anisotropic ring systems exert pronounced

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## Abstract The ^1^H and ^13^C NMR spectra of all [2~__n__~] cyclophanes with the same substitution pattern in both benzene rings and of the skew [2.2.2](1,2,4)(1,2,5)cyclophane were assigned by one‐dimensional NOE difference and two‐dimensional correlation spectroscopy. The ^1^H NMR spectra of the