H plus C2H4 - CH3CH2 TS      1 H plus C2H4 - CH3CH2 TS

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    #  Species Formula
    42 OH(-) plus CH3F - HOCH3 plus F(-) TSCH4OF
    43 HF2 TSHF2
    44 FCH3F TS 1CH3F2
    45 EP(-) plus CH3O(-) TSC3H7O5P
    46 REP(-) plus CH3O(-) TSC5H9O6P
    47 HClH TSH2Cl
    48 CH3 plus FCl - CH3F plus Cl TSCH3FCl
    49 F - CH3 - Cl(-) TS, forward reactionCH3FCl
    50 FCH3Cl TS 1CH3FCl
    51 Cl-CH3-Cl (-) TSCH3Cl2
     1 H plus C2H4 - CH3CH2 TS C2H5
     2 CH3 plus C2H4 - CH3CH2CH2 TSC3H7
     3 hc1 - Ring-opening cyclobutene TSC4H6
     4 hc5 - Cyclobutadiene TSC5H6
     5 hc4 - Pentadiene TSC5H8
     6 hc2 - Hexatriene to cyclohexadiene TSC6H8
     7 hc7 - Ethylene plus butadiene Diels-Alder TSC6H10
     8 hc6 - 1,5 Hexadiene TSC6H10
     9 hc8 - Cyclobutadiene plus ethylene TSC7H10
    10 hc3 - Dimethylene to cyclobuta - benzene TSC8H8
    11 hc10 - Cyclonona-1,4,7-triene TSC9H12


ΔHf: 2.0 kcal/mol,     REF: Yan Zhao, Núria González-García, and Donald G. Truhlar, "Benchmark Database of Barrier Heights for Heavy Atom Transfer, Nucleophilic Substitution, Association, and Unimolecular Reactions and Its Use to Test Theoretical Methods" J. Phys.
  

      H plus C2H4 - CH3CH2 TS
      h=2.05+"H plus C2H4" hr=zgt2005
  H     0.00000000  0    0.0000000  0    0.0000000  0     0     0     0
  C     2.91760000  1    0.0000000  0    0.0000000  0     1     0     0
  C     1.33105200  1   46.9514420  1    0.0000000  0     2     1     0
  H     1.07991200  1  123.4718030  1 -106.6827950  1     2     1     3
  H     1.07960300  1  101.8718700  1 -127.9648730  1     2     1     4
  H     1.08192600  1  123.6133820  1   73.8585750  1     3     2     1
  H     1.08018300  1  123.5547430  1  179.2844910  1     3     2     6