182175-35-5Relevant academic research and scientific papers
New phosphabenzenes by [4 + 2] cycloaddition of stannoles to 1-phospha-1-alkynes - Determination of signs of coupling constants [nJ(31P, 13C), nJ(31P, 1H), 2J(31P, 29Si), 2J(119Sn, 31P)]
Wrackmeyer, Bernd,Klaus, Uwe
, p. 211 - 226 (2007/10/03)
Stannoles bearing dialkylboryl groups in 3-position react with 1-phospha-1-alkynes P≡C-tBu (1) and P≡C-CH2 tBu (2) by [4 + 2] cycloaddition and elimination of stannylene to give phosphabenzenes in high yield. The stannylenes oligomerise to give [R12Sn]n with n ≥ 7 (R = Me, Et, -(CH2)5-or, in the case of R1 = tBu, react with the stannole itself. All phosphabenzenes are characterised by their consistent sets of NMR data. The absolute signs of the coupling constants nJ(31P, 1H), nJ(31P, 13C), 2J(31P, 29Si) and 2J(119Sn, 31P) were determined by appropriate 1D and 2D NMR experiments.
