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Structure of 13626-17-0
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Polyphosphoric acid is used as a dehydrating agent, cyclizing agent, acylating agent, analytical reagent and as a ring closing reagent. It is used in the production of phosphate esters, acid phosphates and pharmaceuticals. It is involved in metal treatment and as an asphalt and a bitumen additive. Furthermore, it is employed for the determination of tryptophan and used a reagent for the alkylation and acylation reactions of aromatic and alkenic compounds.
3,5-Dibromo-4-chloropyridine serves as a versatile building block in heterocyclic synthesis, enabling regioselective functionalization via palladium-catalyzed cross-coupling reactions. The ortho-bromine and chlorine substituents provide complementary reactivity for sequential derivatization, while the pyridine core offers stability and compatibility with standard synthetic workflows. Its bench-stable nature and predictable transformation profile make it ideal for constructing complex scaffolds in medicinal chemistry and materials science applications.
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GHS Pictogram :
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GHS No : GHS06
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Signal Word : Danger
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UN#: 2811
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Class : 6.1
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Packing Group : Ⅲ
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Hazard Statements : H315-H319-H335
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Precautionary Statements : P261-P264-P271-P280-P302+P352-P304+P340-P362+P364-P405-P501
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Lot numbers can be found on the outside label of a product: