Isoprene (short for isoterpene) or 2-methyl-1,3-butadiene is a common organic compound with the formula CH2=C(CH3)CH=CH2. It is present under standard conditions as a colorless liquid. It is the monomer of natural rubber and is a precursor to an immense variety of other naturally occurring compounds. Occurrence and production Natural rubber is a polymer of isoprene — most often cis-1,4-polyisoprene — with a molecular weight of 100,000 to 1,000,000. Typically, a few percent of other… (More on Isoprene)