PM7 Accuracy

methylmethylene     66 Methylmethylene

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    #  Species Formula
    56 Methyl lithium (Geo)H3LiC
    57 Methyl lithiumH3LiC
    58 Carbon, dimer (Geo)C2
    59 AcetyleneC2H2
    60 Acetylene (Geo)C2H2
    61 Vinyl, cationC2H3
    62 VinylC2H3
    63 Ethylene, cationC2H4
    64 Ethylene (Geo)C2H4
    65 EthyleneC2H4
    66 Methylmethylene C2H4
    67 Ethyl, cationC2H5
    68 Ethyl radicalC2H5
    69 Ethane (Geo)C2H6
    70 EthaneC2H6
    71 Lithium acetylide (Geo)HLiC2
    72 Lithium acetylideHLiC2
    73 LiCH=CH2H3LiC2
    74 Ethyl lithiumH5LiC2
    75 Ethyl lithium (Geo)H5LiC2
    76 Dimethylberyllium (Geo)H6BeC2


DHf: 90.3 kcal/mol,     REF: S. Schroder, W. Thiel, J. Am. Chem. Soc., 107, 4422 (1985). "BEST" ab-initio involving at least MP2 correction to 6-31G* wavefunctions.
  
 PM7
Methylmethylene
 H=90.3 HR=ST1985
  C     0.00000000  0    0.0000000  0    0.0000000  0     0     0     0
  C     1.45548183  1    0.0000000  0    0.0000000  0     1     0     0
 XX     2.00000000  0   90.0000000  0    0.0000000  0     2     1     0
  H     1.10788443  1  108.7324246  1    0.0000000  0     1     2     3
  H     1.09406928  1  118.2970952  1  123.8192568  1     1     2     3
  H     1.10820971  1  108.6217991  1 -112.6167544  1     1     2     3
  H     1.08147251  1  116.3873413  1 -124.2205726  1     2     1     3