1H and13C nuclear magnetic resonance spectra of benzylidenemalononitriles : a method for the determination of σ+substituent constants

1976 ◽  
pp. 729-732 ◽  
Author(s):  
Tamar B. Posner ◽  
C. Dennis Hall
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Nuclear Magnetic Resonance Spectra ◽  
Substituent Constants ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

5-Nitro-6-substituted-2-norbornenes: determination of Diels-Alder isomer ratios from nuclear magnetic resonance spectra

1967 ◽  
Vol 45 (23) ◽  
pp. 2969-2978 ◽  
Author(s):  
Wayland E. Noland ◽  
Bruce A. Langager ◽  
Joseph W. Manthey ◽  
Anthony G. Zacchei ◽  
Darryl L. Petrak ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Alder Reaction ◽  
Diels Alder ◽  
Diels Alder Reaction ◽  
Nuclear Magnetic Resonance Spectra ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

The nuclear magnetic resonance spectra of representative 5-nitro-6-substituted-2-norbornenes (II–VII) are described. From the spectra, ratios of the two possible endo–exo trans stereoisomers derived from the Diels–Alder reaction of cyclopentadiene with the appropriate trans nitroölefin are estimated as shown in Table II. For all cases, there was predominance (3:1 to 9:1) of the 5-endo-nitro trans stereoisomer. The synthesis of the 6-(p-nitrophenyl) (V), 6-(2-furyl) (VI), and 6-(2-thienyl) (VII) derivatives is reported and the 6-ethyl derivative (III) has been characterized

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