Accuracy

vinylacetr    109 Vinylacetylene (Geo)

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    #  Species Formula
    99 Propane (Geo)C3H8
   100 Isopropyl lithiumH7LiC3
   101 Isopropyl lithium (Geo)H7LiC3
   102 Trimethyborane (Geo)H9BC3
   103 TrimethylboraneH9BC3
   104 Carbon, tetramerC4
   105 Diacetylene (Geo)C4H2
   106 DiacetyleneC4H2
   107 CH2=C=C=CH2 (Geo)C4H4
   108 CH2=C=C=CH2C4H4
   109 Vinylacetylene (Geo) C4H4
   110 VinylacetyleneC4H4
   111 1,2-ButadieneC4H6
   112 1,3-ButadieneC4H6
   113 1-ButyneC4H6
   114 2-ButyneC4H6
   115 Bicyclobutane (Geo)C4H6
   116 BicyclobutaneC4H6
   117 2-Butyne (Geo)C4H6
   118 CyclobuteneC4H6
   119 Methyl cyclopropeneC4H6


REF: T. Fukuyama, K. Kuchitsu, Y. Morino, Bull. Chem. Soc. Jap., 42, 379 (1969).
  
 PM7
Vinylacetylene
 GR=FKM1969 <C3-C4> <C2-C3> <C2-C3-C4> <C1-C2>
  C     0.00000000 +0    0.0000000 +0    0.0000000 +0     0     0     0
  C     1.34100000 +1    0.0000000 +0    0.0000000 +0     1     0     0
  C     1.43100000 +1  123.1000000 +1    0.0000000 +0     2     1     0
 XX     1.00000000 +0   90.0000000 +0  180.0000000 +0     3     2     1
  C     1.20800000 +1   90.0000000 +0  180.0000000 +0     3     4     2
 XX     1.00000000 +0   90.0000000 +0    0.0000000 +0     5     3     4
  H     1.02799533 +1   90.0000000 +0  180.0000000 +0     5     6     3
  H     1.08024685 +1  123.6096754 +1    0.0000000 +0     1     2     3
  H     1.07965618 +1  123.2130063 +1  180.0000000 +0     1     2     3
  H     1.09708912 +1  121.9460899 +1  180.0000000 +0     2     1     3