689-97-4Relevant articles and documents
Fraser et al.
, p. 1456,1457 (1975)
The i.r., Raman and microwave spectra of 1-butene-3-yne (vinylacetylene) and 1-butene-3-yne-4d
Torneng, E.,Nielsen, C. J.,Klaeboe, P.,Hopf, H.,Priebe, H.
, p. 975 - 988 (1980)
The i.r. spectra of 1-butene-3-yne and 1-butene-3-yne-4d in the vapour phase and as crystalline solids at 90 K were recorded in the region 5000-100 cm-1.Raman spectra, including semiquantitative polarization data, of the neat liquid and of the solid were obtained at 90 K.Microwave spectra of the compounds were recorded in the region 8-40 GHz at ambient temperature.Rotational transitions of the vibrational ground state and of the two lowest vibrational excited states ν13(a') and ν18(a'') were measured.The fundamental frequencies of both compounds were assigned in excellent agreement with the results of normal coordinate calculations.Rotational fine structure was observed for several bands and interpreted as the Q-sub-branches of the perpendicular bands (in the symmetrical top approximation).For six bands the Q-sub-branches were assigned to the proper K-values.The Coriolis coupling constant ξa13,18 was derived from the i.r. and from the microwave spectra.
Reaction Mechanism of the Homogeneous Thermal Decomposition of Acetylene
Tanzawa, T.,Gardiner, W. C.
, p. 236 - 239 (1980)
A modeling study is reported in which experiments on the rate of and product distribution from C2H2 pyrolysis from 625 to 3400 K are described with a single mechanism.The essential primary mechanism at low temperatures proves to consist of an H-atom, vinyl radical chain H + C2H2 -> C2H3, C2H3 + C2H2 -> C4H4+ H producing vinyl acetylene at early times.At high temperatures this is replaced by the ethynyl chain H + C2H2 -> C2H + H2, C2H + C2H2 + H producing diacetylene.By considering a variety of studies simulteneusly it was possible to assign rate constant expressions to the key elementary reactions.While all of the basic observations on the primary decomposition are accounted for by final mechanism, uncertainties still remain in the rates of secondary reactions and in the magnitudes of the fallof corrections required for the unimolecular reactions involved.
A novel risedronic acid-modified Nieuwland catalyst for acetylene dimerization
Zhang, Qixia,Li, Congcong,Luo, Juan,Xie, Jianwei,Zhang, Jinli,Dai, Bin
, (2020)
Nieuwland catalyst (NC) was modified with different phosphonic acids (Px) and evaluated for their acetylene dimerization activity in monovinyl acetylene (MVA) production. Nearly 49.2% of acetylene conversion and 80.3% of MVA selectivity were obtained in 5 mol% risedronic acid (P2)-modified NC under an acetylene-gas space velocity of 105 h?1 at 80 °C, which was 17.8% higher than the yield of the control NC. The characterization results of NC and P2–NC indicated that the addition of P2 effectively enhanced the stability of the Cu ions and inhibited oxidation of the active component Cu+, improving their catalytic activity and long-term stability.
Zelikoff,Aschenbrand
, p. 1034 (1956)
Hedaya et al.
, p. 6880 (1969)
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Hennion et al.
, p. 5160 (1954)
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