1,1‐Ethenediol: The Long Elusive Enol of Acetic Acid
作者:Artur Mardyukov、André K. Eckhardt、Peter R. Schreiner
DOI:10.1002/anie.201915646
日期:2020.3.27
We present the first spectroscopic identification of hitherto unknown 1,1-ethenediol, the enol tautomer of acetic acid. The title compound was generated in the gasphase through flash vacuum pyrolysis of malonic acid at 400 °C. The pyrolysis products were subsequently trapped in argon matrices at 10 K and characterized spectroscopically by means of IR and UV/Vis spectroscopy together with matching
我们首次对迄今为止未知的 1,1-乙烯二醇(乙酸的烯醇互变异构体)进行了光谱鉴定。通过丙二酸在 400 °C 下的快速真空热解,在气相中生成标题化合物。随后将热解产物捕获在 10 K 的氩基质中,并通过红外和紫外/可见光谱进行光谱表征,并将其光谱数据与 CCSD(T)/cc-pCVTZ 和 B3LYP/6-311++ 的计算相匹配。 G(2d,2p) 理论水平。在 λ=254 nm 处光解时,烯醇重排为乙酸和乙烯酮。
Photolysis of allene-ozone mixtures at 647 nm in cryogenic matrices
作者:Karen A. Singmaster、George C. Pimentel
DOI:10.1016/0022-2860(89)80083-3
日期:1989.3
between allene and ozone were carried out at 12 K. Primary photoproducts include carbonmonoxide, acrolein ( cis and trans ), cyclopropanone, ketene, ethylene, allene oxide and formaldehyde. In Ar and Kr matrices both acrolein and cyclopropanone are produced in high yields, whereas in Xe matrices cyclopropanone is the major product. Infrared spectra for cyclopropanone and its oxygen-18 and deuterium
摘要 对丙二烯和臭氧在647 nm 处的光解反应在12 K 下进行基质研究。初级光产物包括一氧化碳、丙烯醛(顺式和反式)、环丙酮、乙烯酮、乙烯、丙二烯氧化物和甲醛。在 Ar 和 Kr 基质中,丙烯醛和环丙酮的产量都很高,而在 Xe 基质中,环丙酮是主要产物。报告了环丙酮及其氧 18 和氘替代物的红外光谱。环丙酮的羰基拉伸在 Ar 基质中的 1815 cm -1 处观察到。还报道了丙二烯氧化物的首次合成。在 1823.4 cm -1 处观察到碳-碳双键拉伸,并表现出小的氧 18 位移。从重原子自旋-单线态-三线态激发的轨道增强,讨论产物分布的变化,
[2 + 1] Cycloaddition of ketene radical cation and ethylene
作者:Chabil Dass、Michael L. Gross
DOI:10.1021/ja00332a003
日期:1984.10
La reaction est etudiee par spectrometrie de masse tandem et par spectrometrie de masse avec transformee de Fourier. La structure du compose d'addition est celle d'un cation radicalaire de cyclobutanone
La reaction est etudiee par spectrometrie de masse tandem et par spectrometrie de masse avec transformee de Fourier。La structure du compose d'addition est celle d'un cation Radialaire de cyclobutanone
Photolysis of matrix-isolated acetyl bromide and the infrared spectrum of the 1:1 molecular complex of hydrogen bromide with ketene in solid argon
作者:N. Kogure、R. Hatakeyama、E. Suzuki、F. Watari
DOI:10.1016/0022-2860(93)80286-5
日期:1993.10
Abstract Ketene and HBr were generated by photolysis of acetyl bromide in an argon matrix. Of the photolysis products, ketene and HBr were trapped in the same matrix cage to form a 1:1molecularcomplex. The HBr stretching mode in the complex was observed at 2396 cm −1 , which was displaced to 160 cm −1 below the frequency of the monomer HBr fundamental in solidargon. The DBr stretching frequency
摘要 通过乙酰溴在氩气基质中的光解生成乙烯酮和HBr。在光解产物中,乙烯酮和 HBr 被困在同一个基质笼中,形成 1:1 的分子复合物。复合物中的 HBr 拉伸模式在 2396 cm -1 处观察到,其位移到低于固态氩中单体 HBr 基本频率的 160 cm -1 。在乙酰溴-d 3 光解时产生的乙烯酮-d 2 -DBr 复合物中的 DBr 伸缩频率在 1717 cm -1 处观察到,该频率比固态氩中单体 DBr 的基本频率低 120 cm -1 。矩阵退火后,这些吸收分别转移到 2383 和 1708 cm -1 。
Electron spin resonance study of the reaction of Group 11 atoms with ketene
作者:François Genin、James A. Howard、Brynmor Mile、Carl A. Hampson
DOI:10.1039/f19898503963
日期:——
107
Ag atoms react with ketene in a rotating cryostat at 77 K to give two major paramagnetic products, a monoligand π-complex, Ag[CH2CO] and a 2-silver-1-oxallyl, CH2C(Ag)O and one minor product formed by addition of Ag to the carbonyl function that has tentatively been identified as α-silver oxyvinyl. These paramagnetic species have been examined by ESR spectroscopy and their magnetic parameters are reported. Au atoms also add to CH2CO to give 2-gold-1-oxallyl [CH2C(Au)O] and a π-complex, Au[CH2CO]. The spectrum from Cu and CH2CO is poorly resolved at low temperatures but the spectrum of 2-copper-1-oxallyl appears upon warming. This species seems to have two non-equivalent hydrogens at low temperatures which become equivalent above 273 K.