The document discusses ethyl triphenyl phosphonium bromide (ETPB) and provides information about the global phase transfer catalyst market. It states that the market is projected to grow from $962 million in 2018 to $1,234 billion by 2024, exhibiting a 5.3% compound annual growth rate due to rising demand for green chemistry in organic synthesis. Phase transfer catalysts help reactants migrate between phases to facilitate chemical reactions. Some leading companies involved in phase transfer catalysts are Sachem Inc., Tokyo Chemical Industry Co., Ltd., Nippon Chemical Industrial Co., Ltd., and others.