Reaction of diazoalkanes with unsaturated compounds
作者:Yu. V. Tomilov、G. P. Okonnishnikova、E. V. Shulishov、K. N. Shavrin、O. M. Nefedov
DOI:10.1007/bf02494283
日期:1998.11
A THF solution of diazopropyne was obtained in 60% yield by the reaction of a 30% aqueous solution of methylamine withN,N′-dinitroso-N,N′-dipropargylterephthalodiamide. The reactions of diazopropyne with methyl acrylate and methyl methacrylate giving various ethynylpyrazolines as well as its CuCl-catalyzed decomposition in the presence of norbornene or norbornadiene yielding ethynylcyclopropanes were
Structure of Triplet Propynylidene (HCCCH) as Probed by IR, UV/vis, and EPR Spectroscopy of Isotopomers
作者:Randal A. Seburg、Eric V. Patterson、Robert J. McMahon
DOI:10.1021/ja901606a
日期:2009.7.8
Spectroscopic data for triplet isotopomers H-C-C-C-H, H-(13)C-C-C-H, and H-C-(13)C-C-H are consistent with computational predictions for a symmetric structure in which the terminal carbons are equivalent (C(2) or C(2v)) and are inconsistent with a planar (C(s)) structure in which they are not. Experimentally observed (13)C isotope shifts in the IR spectra and (13)C hyperfine coupling constants in the
三重同位素 HCCCH、H-(13)CCCH 和 HC-(13)CCH 的光谱数据与对称结构的计算预测一致,其中末端碳是等价的(C(2) 或 C(2v)),并且是与平面 (C(s)) 结构不一致,其中它们不是。实验观察到的红外光谱中的 (13) C 同位素位移和 EPR 光谱中的 (13) C 超精细耦合常数与 C(2) 结构的理论预测值显示出良好的一致性。(13)C 超精细耦合常数还为分子中的键角提供了独立的实验估计。零场分裂参数的同位素相关性揭示了分子运动在调节这些参数值中的影响。对运动效应的解释为合理化异常低的 E 值提供了基础,该值先前已根据轴对称 (D(infinity h)) 结构进行解释。涉及自然键轨道和自然共振理论分析的计算研究提供了对这种反应中间体的自旋密度和复杂电子结构的深入了解。
Thermal conversion of 1-methyl-1,2-diethynylcyclopropane to 2-methylbicyclo[3.2.0]hepta-1,4,6-triene
作者:Michael B. D'Amore、Robert George Bergman
DOI:10.1021/ja01048a077
日期:1969.9
De Meijere; Schulz; Kostikov, Synthesis, 1991, # 7, p. 547 - 560
Base-catalyzed rearrangement of 3-bromobicyclo[3.2.1]octa-2,6-diene to endo-6-ethynylbicyclo[3.1.0]hex-2-ene. Possible intermediacy of a homoconjugated carbene