Synthesis and structure of {{amino(triorganosilyl)carbene}pentacarbonyltungsten(0)} complexes and attempted synthesis of {[2-bis(trimethylsilyl)methyl-3-triorganosilyl-2H-azaphosphirene-κP]pentacarbonyltungsten(0)}

First examples of tungsten aminocarbene complexes [(OC5)W{C(SiR1nR23-n)NH2}] 2a–d (R1 = Ph, R2 = Me) were synthesized via ammonolysis of the corresponding methoxycarbene complexes 1a–d. They were characterized by NMR spectroscopy, MS, IR, UV/Vis and elemental analysis, and in the case of the C-triphenylsilyl derivative 2a by single-crystal X-ray structure analysis. The reaction of P-chloro alkylidenephosphane 3 with complexes 2a–d, meant to give 2H-azaphosphirene complexes, was monitored by 31P NMR spectroscopy to reveal the formation of the products 4–7, which were presumably formed via decomposition of the transient complexes 10a–d.