144951-17-7Relevant articles and documents
Cycloaddition behavior of 3,4-diazacyclopentadienone dioxides toward bicyclo[2.2.1]heptadiene derivatives. X-ray analysis of the cycloadduct and reaction pathway
Eto,Harano,Yoshitake,Hisano
, p. 1557 - 1564 (1993)
The cycloaddition behavior of 2,5-disubstituted 3,4- diazacyclopentadienone dioxide 1a-c toward epoxynaphthalene (2a) and norbornadiene (2b) was investigated. The structures of the products were determined on the basis of the 1H- and 13C-nmr spectral data and the X- ray analysis data. The stereospecific formation of the endo-exo 1,3-dipolar cycloadducts from 2a indicates that the cycloadduct resulted from the direct 1,3-dipolar cycloaddition. The cycloaddition behavior of 1 toward 2 is discussed on the basis of the PM3-calculated transition-state structures.
CYCLOADDITION REACTION OF 4-OXO-4H-PYRAZOLE 1,2-DIOXIDES WITH EPOXYNAPHTHALENE. X-RAY ANALYSIS OF THE CYCLOADDUCT AND SOME COMMENTS ON CYCLOADDITION BEHAVIOR.
Harano, Kazunobu,Yoshitake, Yasuyuki,Eto, Masashi,Hisano, Takuzo
, p. 1707 - 1710 (2007/10/02)
The crystal structure of the cycloadduct of 2,5-bis(methoxycarbonyl)-4-exo-4H-pyrazole 1,2-dioxide with epoxynaphthalene was elucidated.The result indicates that the cycloadduct resulted from the direct 1,3-dipolar cycloaddition.