DIOP

DIOP
Names
	IUPAC name O-Isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane
	Preferred IUPAC name {[(4R,5R)-2,2-Dimethyl-1,3-dioxolane-4,5-diyl]bis(methylene)}bis(diphenylphosphane)
	Other names (−)-2,3-O-Isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane; (−)-1,4-Bis(diphenylphosphino)-1,4-dideoxy-2,3-O-isopropylidene-L-threitol; (+)-2,3-O-Isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane; (+)-1,4-Bis(diphenylphosphino)-1,4-dideoxy-2,3-O-isopropylidene-L-threitol
Identifiers
CAS Number	32305-98-9 (–) ; 37002-48-5 (+) ;
3D model (JSmol)	(–): Interactive image;
ChemSpider	350240 (–);
PubChem CID	395120 (–);
UNII	ESK57W53CI (–) ; 5P52K0IJ7T (+) ;
CompTox Dashboard (EPA)	DTXSID90954109 ;
	InChI (–): InChI=1S/C31H32O2P2/c1-31(2)32-29(23-34(25-15-7-3-8-16-25)26-17-9-4-10-18-26)30(33-31)24-35(27-19-11-5-12-20-27)28-21-13-6-14-22-28/h3-22,29-30H,23-24H2,1-2H3/t29-,30-/m0/s1 Key: VCHDBLPQYJAQSQ-KYJUHHDHSA-N;
	SMILES (–): CC1(O[C@H]([C@@H](O1)CP(c2ccccc2)c3ccccc3)CP(c4ccccc4)c5ccccc5)C;
Properties
Chemical formula	C31H32O2P2
Molar mass	498.543 g·mol−1
Appearance	White solid
Melting point	86 to 89 °C (187 to 192 °F; 359 to 362 K)
Solubility in water	Insoluble
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

DIOP (2,3-O-isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane) is an organophosphorus compound that is used as a chiral ligand in asymmetric catalysis. It is a white solid that is soluble in organic solvents.

DIOP is prepared from the acetonide of d,l-tartaric acid, which is reduced prior to attachment of the PPh₂ substituents.