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 IsopentaneC5H12
   165 n-PentaneC5H12


ΔHf: 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