ИСТИНА

This research is devoted to application of the 31P NMR spectroscopy for determination of enantiomeric composition of CN-palladacycles. The key to this idea implementation was the usage of P-donor chiral derivatizing agent, namely the phosphinite derivative (RC)-Q of the available terpene (1R,2S,5R)-menthol. The efficiency of this approach is illustrated by the examples of planar chiral CN-palladacycles derived from [2.2]paracyclophane imine (D1) and N,N-dimethylaminomethylferrocene (D2). Several advantages of this new method have to be mentioned: (i) diastereomeric phosphinite derivatives of these dimers are quantitatively formed in situ at r.t.; (ii) the reagent (RC)-Q coordination with CN-palladacycles occurs regiospecifically in trans(P,N)-geometry; (iii) tight phosphinite bonding excludes any complications from dynamic processes; (iv) a rather large diastereomeric signal dispersion for phosphinite derivative of racemic dimers rac-D1 and rac-D2 (9.5 and 1.4 ppm, resp.) provides high exactness in determination of CN-palladacycle enantiomeric composition; (v) this method is universal and applicable to any non-phosphorous palladacycles.