Tertiary Butyl Hydroquinone is a new sort of edible oil anti-oxidant, and its prep work method has actually only been reported in the past ten years. Currently, there are two approaches for preparing TBHQ, namely the tert-butanol technique as well as the isobutylene technique.
When tert-butyl alcohol is used as the alkylating representative, the TBHQ yield is 29.8%, while when isobutylene is utilized as the alkylating agent, the return is unidentified (see Liu Shuxing, Li Hongliang Food Additives, Sinopec Press, 2001, 68-69. Yao Huanzhang, Food Additives, China Materials Publishing House, 2001, 65) The reaction between tert-butyl alcohol or isobutylene and also hydroquinone is a Fridel-Crafts alkylation response. The reaction system is the electrophilic alternative of tert-butyl carbocation on the aromatic ring. The secret to the awareness of this procedure depends on the generation of tert-butyl carbocation. When the tert-butyl carbocation appears, it will immediately launch an electrophilic attack on the aromatic ring of hydroquinone, at some point making the hydroquinone tert-butylated. Tert-butyl alcohol as well as isobutylene can generate tert-butyl carbocation in the complying with means.
CN1762944A divulges a prep work approach of Tertiary Butyl Hydroquinone, using methyl tert-butyl ether (MTBE) as an alkylating representative, responding with hydroquinone under the activity of a solvent and also an acid driver to prepare 2-tert-butyl hydroquinone (TBHQ), add a hydrocarbyl transfer reagent in the reflux state, the solvent is toluene or xylene, the acid stimulant is sulfuric acid, as well as the hydrocarbyl transfer reagent is 2,5 tert-butyl hydroquinone (DBHQ).
The process is easy, the reaction problems are moderate and also feasible, the expense of raw materials is low, and the item return is high. It can effectively lower the expense of the target item, boost financial advantages, and is simple to use and also execute.
