Gas phase thermolysis of pyrazolines. 5. Electronic structure and gas phase thermolysis of tetrazole derivatives studied by photoelectron spectroscopy
作者:Adel Awadallah、Klaus Kowski、Paul Rademacher
DOI:10.1002/jhet.5570340119
日期:1997.1
The photoelectron spectra of substituted tetrazoles 1–3, 1,4-dihydro-5H-tetrazol-5-ones 4–9, and 1,4-dihydro-5H-tetrazole-5-thiones 10–15 have been recorded. Based on PM3 and some ab initio calculations, the ionization potentials have been assigned to molecular orbitals. Gas-phase thermolyses of 1–15 have been studied by real-time gas analysis controlled by photoelectron spectroscopy. Compounds 1 and
已记录了取代的四唑1-3、1,4-二氢-5 H-四唑-5-酮4-9和1,4-二氢-5 H-四唑-5-硫酮10-15的光电子光谱。基于PM3和一些从头开始在计算中,电离势已分配给分子轨道。通过实时电子分析(由光电子能谱法控制)研究了1-15的气相热解。化合物1和2分别损失甲醛和硫代甲醛,剩下未取代的四唑(16),该四唑主要通过氮分子的挤出和氰胺的形成而分解。硫杂环丁烷从3中分离出来,剩余的分子分解成较小的产物。通过[3 + 2]环还原将化合物4-9裂解为异氰酸酯和叠氮化物。一些不对称取代的化合物在该反应中表现出明显的选择性。对于硫酮10–15[3 + 2]环还原是提供异硫氰酸酯和叠氮化物的主要分解方法。另外,硫原子可以分裂并二聚或抽象氢原子以形成硫化氢。噻吩,甲醛,硫代甲醛和乙醛等某些产品仅由取代基产生。光电子能谱被证明是进行此类热解研究的极好方法。