论文部分内容阅读
31P(1H) NMR 和1H NMR研究表明, 当NaOH 加入到水溶性铑膦配合物HRh(CO)·(TPPTS)3[TPPTS: P(m -C6H4SO3Na)3]后, 可观察到有少量的OTPPTS[OTPPTS: O= P(m -C6H4SO3Na)3]出现, 但配合物的特征谱峰即使在高浓度的NaOH 存在下也基本保持不变, 表明NaOH 对配合物分子结构的影响较小; 当吡啶加入到HRh(CO)(TPPTS)3 中, 31P(1H) NMR谱图中出现游离配体TPPTS的31P谱峰及若干结构未知的新水溶性配合物的31P谱峰, 表明吡啶分子将与配合物分子中的配体TPPTS发生配体交换反应. 在HRh(CO)(TPPTS)3 中分别加入一定量的HCl, HNO3, H2SO4 和H3PO4 等无机酸时, 随着酸量的增加, 配合物的31P物种含量逐渐下降, 而OTPPTS量明显上升, 直至配合物31P物种完全消失; 高浓度乙酸对配合物结构的影响与上述无机酸类似. HRh(CO)(TPPTS)3 的1-己烯氢甲酰化催化反应结果表明, 碱存在下可获得较高的正异构醛比值, 但催化活性降低; 酸存在下所得产物正异构醛比值相对较低且呈淡黄色. 可见, 酸对H?
The results of 31P (1H) NMR and 1H NMR showed that a small amount of OTPPTS was observed after the addition of NaOH to water-soluble rhodium phosphine complex HRh (CO) · TPPTS 3 [TPPTS: P (m -C6H4SO3Na) 3] (O-PTP: O = P (m -C6H4SO3Na) 3], but the characteristic peaks of the complexes remained unchanged even in the presence of high concentration of NaOH, indicating that NaOH had little effect on the molecular structure of the complexes. The 31P peak of the free ligand TPPTS and the 31P peak of several new water-soluble complexes of unknown structure appeared in the 31P (1H) NMR spectrum of HRh (CO) (TPPTS) 3, indicating that the pyridine molecule will react with the complex Ligand exchange reaction takes place in ligand TPPTS. When a certain amount of inorganic acids such as HCl, HNO3, H2SO4 and H3PO4 were added into HRh (CO) (TPPTS) 3, the content of 31P species decreased gradually with the increase of acid amount, while the amount of OTPPTS increased obviously Complex 31P species completely disappeared; high concentrations of acetic acid on the structure of the complex with the above inorganic acid similar. The results of 1-hexene hydroformylation catalyzed by HRh (CO) (TPPTS) 3 showed that the higher n-iso-aldehyde ratio could be obtained in the presence of base, but the catalytic activity decreased. In the presence of acid, The ratio is relatively low and light yellow. Visible, acid H?