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-range nuclear spin-spin coupling [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
的未解决的影响远程核自旋偶合[ Ñ Ĵ(11 BX)(Ñ > 1; X = 13 C,29 Si或119的Sn)]就X共振已经研究了氨基硼烷(1和2),卤代化(2和4),氢硼化(5)和炔烃的有机硼化产物(6和7)。X共振的在X NMR差动加宽光谱从产生Ñ Ĵ(11 BX)(对于X =最明显119Sn)显示了各种偶联途径的定性有用模式。| 2 J(13 CN- 11 B)| 在图1和图2中,似乎对反配体和环的敏感性敏感。在许多alkenylboranes(3,4,图5b和d,6和7)跨过CC双键的耦合常数的幅度遵循趋势| 2 Ĵ(11 BX)| 〜| 3 Ĵ(11 BX)| 顺式<| 3Ĵ(11 BX)| 反。CC双键上正电取代基数量的增加导致||的大小增加。3 Ĵ(11 BX)| 顺,反。如果只有氢的有机基团连接到CC双键上,如炔烃的硼氢化产物(5a和c)| n J(13