An investigation of steric effects along a cyclopentadienyl substituent: a study by 1H, 13C and 29Si NMR spectroscopy of bis(trimethylsilyl)cyclopentadienyl iron complexes
作者:David White、Laurence Carlton、Neil J. Coville
DOI:10.1016/0022-328x(92)83480-6
日期:1992.11
syntheses of a range of complexes, [(η5-C5H3(SiMe3)2)Fe(CO)(L)I], (L tBuNC, 2,6-Me2C6H3NC (xylNC), P(OMe)3, PMe2Ph, P(O-o-tol)3 PPh3, P(m-tol)3, P(p-tol)3, and P(CH2Ph)3) are reported. Three separate cyclopentadienyl ring proton resonances were observed in the NMR spectra of the iron complexes, and their assignments determined from NOE experiments (L P(OMe)3, P(O-o-tol)3). The 13C NMR spectra were recorded
的范围配合物,[(η的合成5 -C 5 H ^ 3(森达3)2)的Fe(CO)(L)I],(L吨BuNC,2,6--ME 2 ç 6 ħ 3 NC (xylNC),P(OMe)3,PMe 2 Ph,P(O- o- tol)3 PPh 3,P(m- tol)3,P(p- tol)3和P(CH 2 Ph)3)的报告。在铁络合物的NMR光谱中观察到三个独立的环戊二烯基环质子共振,并根据NOE实验(LP(OMe)3,P(O- o- tol)3)确定了它们的归属。的13 C NMR光谱记录和从所述的知识进行的转让1个H光谱通过利用CH的相关光谱学。还获得了29 Si和31 P NMR数据。在NMR共振对的分离之间观察到三维相关性(29 Si,13 C和1H)和(I)由托尔曼锥角,θ测量,位阻效应(ii)因ν测量电子效应CO,羰基的伸缩频率。相关程度随NMR活性核与铁原子(环C和Si(CH 3)3