@article {1991|1767, title = {Mechanism of the rearrangement of the bicyclo [4.2. 0] octan system to the bicyclo [3.2. 1] octan system}, journal = {Tetrahedron}, volume = {47}, year = {1991}, pages = {229{\textendash}238}, abstract = {

A concerted mechanism has been demonstrated for the rearrangement of a tetracyclic ion including a bicyclo [4.2.0] octan system to hibaol, using a selective deuteration on the migrating bond. The stereochemistry of the selectively introduced deuterium was determined by three routes: 1. comparison of the high field 1H NMR spectra of the deuterated and undeuterated compounds, using double irradiation; 2. high field 1H NMR, coupled with molecular mechanics calculations; 3. two dimensional homo and heteronuclear NMR.

}, doi = {10.1016/S0040-4020(01)80919-4}, url = {http://www.sciencedirect.com/science/article/pii/S0040402001809194}, author = {Bastard, Josette and Do Khac, Duc and Fetizon, Marcel and Chantal Pr{\'e}vost and Beloeil, Jean-Claude} } @article {1991|1719, title = {NMR and conformational studies of the cyclobutane ring involved in the bicyclo [4.2. 0] octane system of a tetracyclic diterpene structure}, journal = {Magn. Reson. Chem.}, volume = {29}, year = {1991}, pages = {870{\textendash}877}, abstract = {

Conformational studies were performed on the bicyclo [4.2.0] octane system of a series of related tetracyclic diterpenes, using molecular mechanics and 1H NMR. Both methods gave compatible results, but did not permit the deduction of any quantitative relationship linking the vicinal coupling constants to the cyclobutane dihedral angles. Nevertheless, the Karplus relationship allowed a qualitative interpretation of the coupling constants in terms of conformation. A set of characteristic 1H NMR coupling constants was obtained which allows the interpretation of the 1H NMR spectrum of any compound presenting a similar system.

}, doi = {DOI: 10.1002/mrc.1260290903}, url = {http://onlinelibrary.wiley.com/doi/10.1002/mrc.1260290903/full}, author = {Do Khac Manh, Duc and Fetizon, Marcel and Chantal Pr{\'e}vost and Roy, Pierre} }