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Information Related to Estra-4,9-Diene-3,17-Dione

tem Name: Estra-4, 9-diene-3, 17-dione 
Alias: 19-Norandrosta-4, 9-diene-3, 17-dione 
CAS No.: 5173-46-6 
Molecular Formula: C19H20O2 
Molecular weight: 280.36 
Appearance: White or off white crystalline powder; Assay: ≥ 99% 
Standard: Enterprise standard
Dienes can be divided into three classes, depending on the relative location of the double bonds:
1.Cumulated dienes have the double bonds sharing a common atom as in a group of compounds called allenes.
2.Conjugated dienes have conjugated double bonds separated by one single bond.
3.Unconjugated dienes have the double bonds separated by two or more single bonds. 
They are usually less stable than isomeric conjugated dienes. This can also be known as an isolated diene. Compounds that contain more than two double bonds are called polyenes. Polyenes and dienes, share many of their properties. Diene-containing fatty acids are biosynthesized from acetyl CoA.