Summary
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1.
A study was made of structural orientation in the diene condensation of trans-piperylene with the nitro dienophiles RCH=CHNO2, in which R=H, CH3, C6H5, CCl3, COOCH3.
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2.
In the condensation of trans-piperylene with nitroethylene(R=H)the only reaction product is the ortho isomer.
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3.
In the condensation of trans-piperylene with 1,2-disubstituted nitro dienophiles (R=CH3, C6H5, CCl3, COOCH3) in all cases two structurally isomeric adducts are formed with a great predominance of the ortho isomer.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2024–2029, November 1965
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Dudinskaya, A.A., Novikov, S.S. & Shvekhgeimer, G.A. Structural orientation in the diene condensation of trans-piperylene with some nitro dienophiles. Russ Chem Bull 14, 1988–1992 (1965). https://doi.org/10.1007/BF00845896
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DOI: https://doi.org/10.1007/BF00845896