Comprehensive product yield determinations from the high-temperature, gas-phase pyrolysis of trichloroethene (C2HCl3) using two fused silica tubular flow reactors coupled to in-line gas chromatographic-mass spectrometry analyses are reported. Initial decomposition was observed at 1000 K with formation of HCl and C2Cl2. Pronounced molecular growth was observed at higher temperatures as evidenced by the formation of C2Cl2, C4Cl4, and C6Cl6(cy) as major (≥5mole%) products and C4Cl2, C4Cl6, C6HCl5(cy), C8Cl6(cy), C8Cl8(cy), C10Cl8(cy), and C12Cl8(cy) as minor (≤5mole%) products.