IUPAC Name: Buta-1,3-diyne
The MF of Diacetylene (CAS NO.460-12-8) is C₄H₂.

                           
The MW of Diacetylene (CAS NO.460-12-8) is 50.05868.
Synonyms of Diacetylene (CAS NO.460-12-8): 1,3-Butadiin ; 1,3-Butadiyne ; Biacetylene ; Biethynyl ; Butadiyne
Stability: Stability Highly flammable
Index of Refraction: 1.436
Boiling Point: 10.3 °C
Melting Point: -10 °C  
Density: 0.806 g/ml  
Appearance: gas
EINECS: 207-303-9

  Diacetylene (CAS NO.460-12-8) is used in organic synthesis.This product is an unsaturated aliphatic hydrocarbons, with a simple asphyxiation and weak narcotic effect.

A dangerous explosive. Polymerizes violently above 0°C. Arsenic pentafluoride catalyzes explosive polymerization. Reaction with silver nitrate forms a very explosive friction-sensitive product. When heated to decomposition it emits acrid smoke and fumes.Safety information of Diacetylene (CAS NO.460-12-8):
RIDADR  3161
HazardClass  2.1

 Diacetylene has been identified in the atmosphere of Titan and in the protoplanetary nebula CRL 618 by its characteristic vibrational modes. The molecule is most likely to have formed in Titan's atmosphere by a reaction between acetylene and the ethynyl radical C₂H, which is produced when acetylene undergoes photolysis. This radical can in turn attack the triple bond in acetylene and react efficiently even at cold temperatures.
 Diacetylene, with the formula C₄H₂, is a highly unsaturated hydrocarbon that contains one single bond and two triple bonds. It is the first in the series of polyynes.