Isoxazoline oxidation. An efficient method for the preparation of α,β-unsaturated carbonyl compounds
作者:Albert Padwa、Donald N. Kline、John Perumattam
DOI:10.1016/s0040-4039(00)95872-6
日期:1987.1
MCPBA peracidoxidation of Δ4-isoxazolines derived from the dipolar cycloaddition reaction of nitrones with acetylenes or allenes produces α,β-unsaturated ketones in excellent yield.
Convenient synthesis of substituted 3-aminothiophene-2-carbonitriles from α-acetylenic nitriles and their conversion to thieno[3,2-<i>d</i>]pyrimidines
作者:Wu-Yun Ren、Kambhampati V. B. Rao、Robert S. Klein
DOI:10.1002/jhet.5570230631
日期:1986.11
Several novel 2,4,6-trisubstituted thieno[3,2-d]pyrimidines were synthesized from the hitherto unknown 3-amino-5-methyl-(or 5-phenyl)thiophene-2-carbonitriles 7 and 8. o-Aminonitriles 7 and 8 were obtained in a single step by conjugate addition of mercaptoacetonitrile (generated in situ) to substituted acetylenic nitriles 4 and 5 and annelation of the intermediate vinylic thioethers.
从迄今未知的3-氨基-5-甲基-(或5-苯基)噻吩-2-腈7和8合成了几种新颖的2,4,6-三取代噻吩并[3,2- d ]嘧啶。通过将巯基乙腈(原位生成)共轭添加到取代的乙炔腈4和5中,并使中间体乙烯基硫醚脱环,可以一步制得邻氨基甲酸酯7和8。
Low temperature rate coefficients for the reactions of CN and C2H radicals with allene (CH2CCH2) and methyl acetylene (CH3CCH)
作者:David Carty、Valery Le Page、Ian R. Sims、Ian W.M. Smith
DOI:10.1016/s0009-2614(01)00682-0
日期:2001.8
(Cinétique de Réaction en Ecoulement Supersonique Uniforme or Reaction Kinetics in Uniform Supersonic Flow) apparatus, rate coefficients have been measured for the reactions of the cyanogen (CN) and ethynyl (C2H) radicals with allene (CH2CCH2) and methylacetylene (CH3CCH) at temperatures from 295 down to 15 K for the reactions of CN and down to 63 K for those of C2H. All four reactions occur at rates
使用连续流动CRESU(均匀超声流中的CinétiquedeRéactionen Ecoulement超音速均匀或反应动力学)设备,测量了氰根(CN)和乙炔基(C 2 H)自由基与丙二烯(CH 2)反应的速率系数CCH 2)和甲基乙炔(CH 3 CCH)在从295到15 K中的CN的反应和下降到63 K中的那些℃的温度2 H.所有四种反应的速率发生接近碰撞确定的极限。将其结果与先前针对其它烯烃和炔烃的反应获得的那些进行比较,并且,在由Vakhtin等伴随的信,与结果Ç 2 H + CH 2 CCH2和使用脉冲Laval装置在103 K下获得的C 2 H + CH 3 C = CH 。讨论了这些最新结果对星际云和行星大气化学的影响。
Microwave Spectrum of Methyl-Cyanoacetylene
作者:J. SHERIDAN、L. F. THOMAS
DOI:10.1038/174798a0
日期:1954.10
the object of studying the microwave spectrum of this substance, we have prepared it by the method used for obtaining higher alkyl-cyanoacetylenes by Grignard and Courtot1 and Curran and Wenzke2. The Grignardreagent, H3CCCMgBr, was treated with cyanogen chloride and a moderate yield of methyl-cyanoacetylene isolated as a colourless, low-melting solid of sweet, penetrating aromatic odour. The best sample
previous methods. The possibility of forming methylcyanoacetylene and MeC5N by gas-phase photolysis was evaluated from relevant acetylenederivatives in the context of space science. The reactivity of MeC5N toward simple nucleophiles was investigated. The exclusive formation of E adducts was observed, together with a solvent dependence for the regioselectivity of the addition.