ISSN:
0749-1581
Keywords:
Tetra- and penta-cyclic norbornane/ene fused
;
1,3- and 3,1-oxazines
;
Cycloaddition
;
Positional
;
isomerism
;
Configuration and Configuration
;
Mono- and bis-adducts
;
1H, 13C NMR
;
DNOE
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The steric structures of the tetracyclic mono- and the pentacyclic bis-adducts formed in the cycloadditions of norbornane- and norbornene-fused 1,3- and 3,1-dihydrooxazine dipolarophiles with diphenylnitrilimine or benzonitrile oxide were investigated. These reactions could yield 2-8 annellation and positional isomers. The structures of the products were proved by 1H and 13C NMR spectroseopy, and the various potentially stable conformations of the flexible hetero rings were evaluated. The assignments were confirmed by double resonance and DEPT measurements; the steric structures were supported by the results of DNOE experiments.
Additional Material:
2 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1260250715
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