The formation in high yields of various substituted allenes by the reaction of triethylborane with alkynyl stannanes is reported. NMR data (1H, 11B, 13C, 119Sn) of the allenes and of their derivatives prepared by the reaction of the allenes with acetic acid prove the proposed structures.
Long-range nuclear spin-spin coupling between 11B and 13C, 29Si or 119Sn: a promising tool for structural assignment
作者:Bernd Wrackmeyer
DOI:10.1016/s0277-5387(00)84848-2
日期:——
The influence of unresolved long-rangenuclearspin-spincoupling [nJ(11BX) (n > 1; X = 13C, 29Si or 119Sn)] on X resonances has been studied for aminoboranes (1 and 2), haloboration (2 and 4), hydroboration (5) and organoboration products of alkynes (6 and 7). The differential broadening of X resonances in the X NMR spectra arising from nJ(11BX) (most obvious for X= 119Sn) shows a qualitatively