负离子双锂引发剂体系的研究 Ⅰ.从萘锂-锂粉可逆平衡体系合成双锂短链引发剂及其机理的探讨

Study on anionic dilithium initiator systemⅠ.Synthesis and synthetic mechanism of dilithium initiator in reversible balance system of naphthalene lithium and lithium powder

探讨了四氢呋喃存在下，在苯中合成萘锂－锂粉复合引发剂的原因和机理，认为苯的共轭π键对金属锂的高度分散和高活性起很大作用。利用量子化学计算讨论和分析了丁二烯负离子自由基的结构及偶合方式。借助气相色谱－质谱联用法分析了丁二烯二聚体的结构，从而为偶合机理提供了可靠的证据。

The principle and mechanism of naphthalene lithium synthesized in benzene in the presence of a small amount of THF were analyzed; a view point that conjugated bonds of benzene played an important role in lithium being dispersed and showing high reactivity. On the basis of calculation of quantum chemistry (MNDO) the anion-radical structure of butadiene lithium and its coupling mechanism were proposed.The structure of butadienyl dimer characterized by GC-MS and a reliable evidence of coupling mechanism was offered.