E. G. Neganova

Arylation of 6H-dibenzo[c,e][1,2λ5]oxaphosphinine 6-oxide

Arylation and alkylation of 6H-dibenzo[c,e][1,2λ5]oxaphosphinine 6-oxide at the phosphorus atom was accomplished. Tetrafluoro-4-pyridyl fragment was introduced via reaction of 6-trimethylsiloxy-6H-dibenzo[c,e][1,2]oxaphosphinine with pentafluoropyridine. The arylation of the title compound with aryl iodides containing both electron-acceptor and electron-donor substituents was effected under catalysis by palladium or nickel complexes.

Kinetically and thermodynamically controlled interaction of organo-silicon (-boron) halides with lithium salts of acylphosphines. Influence of solvents and electrophilic catalysts

Abstract Kinetically controlled interaction of (R 1 PCOR 2 )Li with R 3 SiCl in nonsolvating media gives P -silylated acylphosphines, which rearrange to O-E isomers. Direct formation of O-Z isomers was observed in solvating media with R 2 BX and R 3 SiX. Equilibria of E/Z isomers exist for B- or Si-derivatives of isobutyrylphosphines. Both isomers rearrange irreversibly to vinylphosphines.

Dimethylsulfonium Methylide in Methylation of Silylphosphines

Selective monodesilylation of bissilylated alkyl- or arylphosphines under the action of dimethylsulfonium methylide and the subsequent methylation of the resulting silyl phosphides with the sulfonium salt offers a convenient route to difficultly accessible monosilylated secondary methylalkyl(aryl)phosphines.

Element-Substituted Acylphosphines

Abstract Element-substituted acylphosphines are stable in form 2 R1P(ERn)COR2 (A), when E=Ge, Sn, Sb, P, T1 and in form R1 P=C(OERn)R2 by NMR data. The reaction

Reversible Phosphaalkene Formation Frol'i Iminodi-Phosphines

Abstract Addition of variousnucleophiles to phosphaalkenes is considered to be irreversible. As an example, the quantitative formation of iminodiphosphine III from phosphinous amide and phosphaalkene was recently reported (1).