PM7 Accuracy

methylene cyclobutane    155 Methylene cyclobutane

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    #  Species Formula
   145 Cyclopentadienyl, anionC5H5
   146 Cyclopentadiene (Geo)C5H6
   147 CyclopentadieneC5H6
   148 1,2-Dimethyl cyclopropeneC5H8
   149 1,4-PentadieneC5H8
   150 1,cis-3-PentadieneC5H8
   151 1,trans-3-PentadieneC5H8
   152 Bicyclo(2.1.0)-pentaneC5H8
   153 CyclopenteneC5H8
   154 IsopreneC5H8
   155 Methylene cyclobutane C5H8
   156 Spiropentane (Geo)C5H8
   157 SpiropentaneC5H8
   158 Cyclopentyl, cationC5H9
   159 2-Methyl-2-buteneC5H10
   160 cis-2-PenteneC5H10
   161 cis-DimethylcyclopropaneC5H10
   162 CyclopentaneC5H10
   163 trans-2-PenteneC5H10
   164 Neopentyl, anionC5H11
   165 IsopentaneC5H12


DHf: 29.1 kcal/mol,     REF: W. D. Good, R. T. Moore, A. G. Osborn, D. R. Douslin, J. Chem. Thermodyn., 6, 303 (1974).
  
 SYMMETRY PM7
Methylene cyclobutane
 H=29.1 HR=GMOD1974
  C     0.00000000  0    0.0000000  0    0.0000000  0     0     0     0
  C     1.32205850  1    0.0000000  0    0.0000000  0     1     0     0
  C     1.51155230  1  133.6157034  1    0.0000000  0     2     1     0
  C     1.51155230  0  133.6157034  0  180.0000000  0     2     1     3
 XX     1.00000000  0   90.0000000  0  180.0000000  0     2     1     4
  C     2.15615263  1   90.0000000  0  180.0000000  0     2     5     1
  H     1.07784248  1  123.5065198  1  180.0000000  0     1     2     3
  H     1.07784248  0  123.5065198  0    0.0000000  0     1     2     3
  H     1.09414680  1  125.9827509  1   90.0000000  0     3     4     2
  H     1.09414680  0  125.9827509  0  -90.0000000  0     3     4     2
  H     1.09414680  0  125.9827509  0  -90.0000000  0     4     3     2
  H     1.09414680  0  125.9827509  0   90.0000000  0     4     3     2
  H     1.09066868  1  125.6632576  1   90.0000000  0     6     2     5
  H     1.09066868  0  125.6632576  0  -90.0000000  0     6     2     5
 
   3  1    4
   3  2    4
   7  1    8
   7  2    8
   9  1   10   11   12
   9  2   10   11   12
  13  1   14
  13  2   14