Excess isopropyl- or neopentylamine react with dichloroquinoxaline to the respective diaminoquinoxalines and further with triethyl orthoformate to quinoxaline-anellated imidazolium salts as precursors for quinoxaline-anellated imidazolin-2-ylidene transition metal complexes. The bulky tert-butylamine replaces only one chlorine atom and opens, via a second amination step, a route to unsymmetrically N,N´-substituted diaminoquinoxalines as potential precursors to quinox-NHCs with different N,N´-substituents. A convenient high-yield access to the new trans-(iPr₂quinoxImy)₂PdX₂ (X = Cl, I) complexes, supplementing an earlier communication on the first quinox-NHC-Rh(COD)Cl and Ag complexes, was provided by the reaction of PdCl₂/NaOAc or Pd(OAc)₂/2KI with iPr₂quinoxImyH⁺ PF₆⁻ via deprotonation of the C-H acidic precursor salt with acetate. The compounds were characterized by NMR data, assigned via 2D and proton-coupled ¹³C NMR spectra, and/or crystal structure analyses. Short CMe₂-H···Pd and Pd-Cl···C^II distances suggest weak stabilizing interactions, in solution indicated by unusually strong downfield shifts of the CMe₂H protons.

过量的异丙基或新戊胺与二氯喹喔啉反应成相应的二氨基喹喔啉，并进一步与原甲酸三乙酯反应成喹喔啉修饰的咪唑啉盐，作为喹喔啉修饰的咪唑啉-2-亚烷基过渡金属配合物的前体。庞大的叔丁胺仅取代一个氯原子，并通过第二步胺化步骤，开辟了一条路线，使不对称的N，N'-取代的二氨基喹喔啉成为具有不同N，N'-取代基的喹喔啉-NHC的潜在前体。方便获得新反式-（i Pr ₂ quinoxImy）₂ PdX ₂的高产率（X = Cl，I）配合物，通过PdCl ₂ / NaOAc或Pd（OAc）₂ / 2KI与i Pr的反应提供了对第一种喹喔啉-NHC-Rh（COD）Cl和Ag配合物的早期通讯的补充。₂ quinoxImyH ⁺ PF ₆ ^-经由与醋酸CH酸性前体盐的去质子化。化合物通过NMR数据（通过2D和质子耦合的¹³ C NMR光谱分配）和/或晶体结构分析进行表征。CMe ₂ -H···Pd和Pd-Cl····C ^II距离短，表明在溶液中CMe ₂ H的异常强下移表明稳定作用弱 质子