Polyvinylidene chloride or Polyvinylidene dichloride (PVDC) is a homopolymer of vinylidene chloride. The chemical compound 1,2-dichloroethane, commonly known as ethylene dichloride (EDC), is a chlorinated hydrocarbon. The Tebbe reagent is synthesized from titanocene dichloride and trimethylaluminium in toluene solution. They are soluble in esters, ketones, and ethylene dichloride. Such compounds can form in mixtures of sulfur dichloride and selenium halides. An important reaction involves sodium cyclopentadienyl to give titanocene dichloride, TiCl(CH). It is soluble in benzene, oils, carbon disulfide, and disulfur dichloride. Perhaps the simplest hafnium metallocene is halfnocene dichloride. Typical tin compounds are carboxylic acid derivatives of dibutyltin dichloride, such as the dilaurate. Related complexes of tellurium dichloride are known. DETA is a byproduct of the production of ethylenediamine from ethylene dichloride. P"p"PTA is a product of "p"-phenylene diamine (PPD) and terephthaloyl dichloride (TDC). PPTA is a product of "p"-phenylene diamine (PPD) and terephthaloyl dichloride (TDC or TCl). Whereas the anhydrous dichloride is blue, the hydrate is red. Simply heating the hydrates does not afford the anhydrous dichloride.