hc1 - Ring-opening cyclobutene TS      3 hc1 - Ring-opening cyclobutene TS

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    #  Species Formula
    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 TSC2H5
     2 CH3 plus C2H4 - CH3CH2CH2 TSC3H7
     3 hc1 - Ring-opening cyclobutene TS C4H6
     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
    12 hc9 - Two cyclopentadiene TSC10H12
    13 hc11 - Cycloduodeca-1,5,9-triene TSC12H18


ΔHf: 31.9 kcal/mol,     REF: Ess, D. H., Houk, K. N., Activation Energies of Pericyclic Reactions ... J. Phys. Chem. A 109 9542-9553 2005
  

      hc1 - Ring-opening cyclobutene TS
      H=31.9+"cyclobutene" hr=EH2005
  C     0.00000000  0    0.0000000  0    0.0000000  0     0     0     0
  C     1.41547500  1    0.0000000  0    0.0000000  0     1     0     0
  C     1.39023400  1  103.3548420  1    0.0000000  0     1     2     0
  C     1.41550700  1  103.3484720  1   21.6151780  1     3     1     2
  H     1.06879100  1  126.9138810  1  174.0151510  1     1     2     3
  H     1.07639800  1  121.6377270  1 -140.1541030  1     2     1     3
  H     1.07981400  1  122.4782570  1 -159.9707540  1     2     1     6
  H     1.06882200  1  129.4178070  1 -173.8280150  1     3     1     4
  H     1.07654200  1  121.6473200  1 -140.1496040  1     4     3     1
  H     1.07975800  1  122.4728810  1 -159.9701830  1     4     3     9