Tetrahydroxydiboron

Tetrahydroxydiboron
Names
	IUPAC name Hypoboric acid
	Other names (Dihydroxyboranyl)boronic acid; Hypoboric acid; Hypodiboric acid; Sub-boric acid (Unterborsäure in German); 1,1,2,2-Tetrahydroxydiborane
Identifiers
CAS Number	13675-18-8 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:38289;
ChemSpider	9161351;
ECHA InfoCard	100.222.662
PubChem CID	10986154;
UNII	D0Q7FO865W ;
CompTox Dashboard (EPA)	DTXSID40450702 ;
	InChI InChI=1S/B2H4O4/c3-1(4)2(5)6/h3-6H Key: SKOWZLGOFVSKLB-UHFFFAOYSA-N;
	SMILES B(B(O)O)(O)O;
Properties
Chemical formula	B2H4O4
Molar mass	89.65 g·mol−1
Appearance	White powder
Density	1.657
Solubility in water	very soluble
Solubility	ethanol, DMF, DMSO, DMA
Structure
Crystal structure	monoclinic P21/c
Thermochemistry
Std molar; entropy (S⦵298)	125.46 J K−1 mol−1
Std enthalpy of; formation (ΔfH⦵298)	−1410.43 kJ mol−1
Hazards
	GHS labelling:
Hazard statements	H302, H315, H319, H332, H335
Precautionary statements	P261, P264, P270, P271, P280, P301+P312, P302+P352, P304+P312, P304+P340, P305+P351+P338, P312, P321, P330, P332+P313, P337+P313, P362, P403+P233, P405, P501
Related compounds
Related compounds	Diborane; Diboron tetrafluoride; Bis(pinacolato)diboron
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Tetrahydroxydiboron is a chemical reagent which can be used to prepare boronic acids.