A Raman spectroscopic study of the low-frequency vibrations of o-dimethoxybenzene and its methyl deuterated analogues
作者:Henrik Konschin、Henrik Tylli、Bertel Westermark
DOI:10.1016/0022-2860(83)85065-0
日期:1983.11
low-frequency (100–400 cm −1 ) Raman spectra of liquid (at 300 K) and solid (at 130 K) veratrole ( o -dimethoxybenzene), and its methyldeuterated analogues, have been measured. The methyl and methoxyl torsional transitions have been identified, and the corresponding rotational barriers have been determined. The interpretation of the spectra points to a conformationally mixed situation for solid veratrole
摘要 测量了液体(300 K)和固体(130 K)藜芦醇(邻二甲氧基苯)及其甲基氘代类似物的低频(100–400 cm -1 )拉曼光谱。已经确定了甲基和甲氧基扭转转变,并确定了相应的旋转障碍。光谱的解释指出固体藜芦醇的构象混合情况,其中平面和非平面构象异构体可能共存。
Fragmentation selectivity in electron impact ionization mass spectra of substituted dimethoxybenzenes
AbstractSeveral 1‐X‐sabstitirted‐3‐methoxy‐4‐trideuteromethoxybenzens were synthesized and their electron impact ionization mass spectra were measured with an ionizing energy of 20 eV. From the peak intensity ratio of [M CD3 ] and [M CH3] the fragmentation‐directing ability of the substituent X was evaluated. The most powerful group was found to be NH2, which expelled a methoxy methyl group only from its para position. The CH3 group and four halogen atoms, F, Cl, Br and I, exerted a moderate effect Electron‐withdrawing groups such as NO2, CHO and CN had only a little influence on the fragmentation selectivity. These results were interpreted in terms of the effect of X on the distribution of both the unpaired electron and the positive charge in the molecular ion.
Trideuteromethylation Enabled by a Sulfoxonium Metathesis Reaction
作者:Zuyuan Shen、Shilei Zhang、Huihui Geng、Jiarui Wang、Xinyu Zhang、Anqi Zhou、Cheng Yao、Xiaobei Chen、Wei Wang
DOI:10.1021/acs.orglett.8b03641
日期:2019.1.18
A conceptually novel sulfoxonium metathesisreaction between TMSOI and cost-effective DMSO-d6 is developed for the efficient generation of a new trideuteromethylation reagent TDMSOI. The new reagent TDMSOI is produced highly efficiently by simply heating a mixture of TMSOI and DMSO-d6 and directly used for subsequent trideuteromethylation in a “one-pot” operation. The preparative power of the new versatile
TMSOI 和经济高效的 DMSO- d 6之间的概念上新颖的硫鎓复分解反应被开发出来,用于有效生成新型三氘代甲基化试剂 TDMSOI。新试剂TDMSOI只需加热TMSOI和DMSO- d 6的混合物即可高效生产,并直接用于后续的“一锅”操作中的三氘代甲基化。新的多功能试剂和“一锅”方案的制备能力通过其以高产率和有用的方式将-CD 3部分安装到广泛的功能中而得到证明,包括苯酚、苯硫酚、酸性胺和烯醇化亚甲基单元。氘化水平 (>87% D)。