Silyl-nitrogen compounds: Part XII - Mode of addition reactions in trisila-phospha-triazene

Abstract

Tris(trimethylsilyl)-2-phospha-1-triazene (Me₃Si)₂N-P=N(SiMe₃) (<b>1</b>) reacts with alkyllithium RLi (R = Me, Bu) to form an intermediate amide at low temperature, which rearranges into phosphoranide at room temperature. The intermediate amide reacts with Me₃SnCl to form phosphine, (Me₃Si)₂N-P (R)- N(SiMe₃)(SnMe₃) which rearranges slowly at room temperature to form phosphorane (Me₃Si)₂N-P (R)(SnMe₃)(= N(SiMe₃) . However, a similar silyl derivative (Me₃Si)₂N-P (R)- N(SiMe₃) is stable at room temperature and does not migrate intramolecularly into phosphorane.