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The efficiency of cross-coupling between propargyl electrophiles and organotin(IV) or zinc(II) compounds catalyzed by phosphine-palladium complexes has been examined as a function of PR 3 /Pd ratio, the nature of the organometallics, and the nature of the leaving group of the electrophile. The coupling between RC≡CCH 2 Cl and PhSnBu 3 proceeded much more smoothly by use of...
When heated in benzene, phenyl-substituted propargylplatinum(II) complexes, trans-Pt(CH 2 C CPh) (X) (PPh 3 ) 2 (2) (X = Cl, Br, I), isomerized gradually to the more stable allenyl isomers, trans-Pt(CPh=C=CH 2 ) (X) (PPh 3 ) 2 (3), to give rise to an equilibrium mixture of 23 (595), from which 3 (X = Cl) was isolated as an isomerically pure sample....
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