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“…Examination of this mixture by 1 H-decoupled 15 N NMR, after equilibrium was reached, indicated that additional resonance bands had appeared in relative amounts of 12% and 4% with respect to the starting triimine resonance bands. The 12% resonances appeared at δ = 333.6 and 359.1 ppm (vs 15 NH 3 ) as singlets while the 4% resonances appeared at δ = 350.3 and 355.6 ppm as doublets having 3 J N - N = 2.7 Hz . We attributed the 12% resonances to hydrolytically derived IIa while the 4% resonance doublets were attributed to IIb (see Scheme ) and we surmised that these 1-keto-2,3-diiminopropane derivatives were an equilibrating 3:1 mixture of atropisomers.…”
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rupbmjkragerfmgwileyiopcupepmcmbcthiemesagefrontiersapsiucrarxivemeralduhksmucshluniversity-of-gavle
“…Examination of this mixture by 1 H-decoupled 15 N NMR, after equilibrium was reached, indicated that additional resonance bands had appeared in relative amounts of 12% and 4% with respect to the starting triimine resonance bands. The 12% resonances appeared at δ = 333.6 and 359.1 ppm (vs 15 NH 3 ) as singlets while the 4% resonances appeared at δ = 350.3 and 355.6 ppm as doublets having 3 J N - N = 2.7 Hz . We attributed the 12% resonances to hydrolytically derived IIa while the 4% resonance doublets were attributed to IIb (see Scheme ) and we surmised that these 1-keto-2,3-diiminopropane derivatives were an equilibrating 3:1 mixture of atropisomers.…”
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“…Whether the underlying σ-Y-shaped atomic frameworks are capable of supporting fully conjugated π-electron delocalized and stabilized systems has generated considerable debate . Recently we have shown that unconstrained σ-Y-frameworks, supporting cross-conjugated π-systems, have a skewed geometry . In this Letter we report additional examples of unconstrained, cross-conjugated systems that are capable of sampling Y-delocalization.…”
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“…In an attempt to rectify the dearth of information having physico-chemical signiÐ-cance to the problem of helicity in the vic-polyimine family, we have initiated a program of synthesis and NMR analysis of these interesting molecules. 7 The study reported in this paper was initiated to Ðnd a better description of the conformations of sterically unhindered PIMs. The target polymer of our investiga- tion was poly(N-phenyliminomethylene) (/-PIM).…”
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