The ‘one-pot’ syntheses of α,α′-diphosphino-substituted imines: a unique reaction of bulky bis(dialkylamino)chlorophosphines
作者:Antoine Baceiredo、Guy Bertrand、Philip W. Dyer、John Fawcett、Nina Griep-Raming、Olivier Guerret、Martin J. Hanton、David R. Russell、Anna-Maria Williamson
DOI:10.1039/b009867l
日期:——
The reaction between various bis(dialkylamino)chlorophosphines and N-isopropyl-substituted lithium amides afforded bis(α,α′-phosphino)imines in a ‘one-pot’ procedure. These compounds react with sulfur to generate intramolecularly hydrogen-bonded ylide derivatives. The molecular structure of (Pr2iN)2PCH2C(NBut)CH2P(NPri)2 has been determined by X-ray crystallography.
Nitrilimines: Evidence for the Allenic Structure in Solution, Experimental and <i>Ab Initio</i> Studies of the Barrier to Racemization, and First Diastereoselective [3 + 2]-Cycloaddition
solution NMR studies of nitrilimines 4 and 7 demonstrate that they possess a bent allenicstructure. The free energy of activation for racemization is ca. 30 kJ mol(-1). Ab initio/DFT studies performed on nitrilimine with C-P(S)H-2 and N-PH2 substituents 10 show that the most likely pathway for the racemization process is inversion at the carbon atom, followed by rotation of the PSR(2) fragment. Bis(trityl)nitrilimine