Also known as (HO)2B-B(OH)2, tetrahydroxydiborane
Tetrahydroxydiboron is a reagent which has several uses in organic synthesis, notably as a precursor for boronic acids used in Suzuki-Miyaura couplings
Tetrahydroxydiboron is a reagent which has several uses in organic synthesis, notably as a precursor for boronic acids used in Suzuki-Miyaura couplings
==Synthesis== The reaction of boron trichloride with alcohols was reported in 1931, and was used to prepare dimethoxyboron chloride, B(OCH3)2Cl. Egon Wiberg and Wilhelm Ruschmann used it to prepare tetrahydroxydiboron by first introducing the boron–boron bond by reduction with sodium and then hydrolysing the resulting tetramethoxydiboron, B2(OCH3)4, to produce what they termed sub-boric acid. The methanol used in this process can be recycled: BCl3 ->[\text{+ } \ce{CH3OH}][- \text{ } \ce{HCl}] B(OCH3)2Cl ->[\text{+ } \ce{Na}][- \text{ } \ce{NaCl}] B2(OCH3)4 ->[\text{+ } \ce{H2O}][- \text{ } \ce{CH3OH}] B2(OH)4
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).