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(-)-2,3-O-Isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane

Also known as: (-)-DIOP, (R,R)-DIOP, (4R,5R)-DIOP, (-)-2,2-dimethyl-4,5-((diphenylphosphino)dimethyl)dioxolane, (2R,3R)-(-)-1,4-Bis(diphenylphosphino)-2,3-O-isopropylidene-2,3-butanediol, (4R,5R)-(-)-4,5-Bis(diphenylphosphinomethyl)-2,2-dimethyl-1,3-dioxolane, (4R,5R)-(-)-2,2-Dimethyl-4,5-bis((diphenylphosphino)methyl)-1,3-dioxolane, [(4R,5R)-5-(diphenylphosphanylmethyl)-2,2-dimethyl-1,3-dioxolan-4-yl]methyl-diphenylphosphane, (-)-2,3-O-Isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane, EINECS 250-984-2, MFCD00014107

(-)-2,3-O-Isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane (CAS 32305-98-9) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C31H32O2P2 and a molecular weight of 498.53200 g/mol. Key properties include a melting point of 88 - 90ºC, a boiling point of 590.3ºC at 760mmHg and a flash point of 390.9ºC. It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
32305-98-9
Jingsj CID
J-25557-2
Molecular Formula
C31H32O2P2
Molecular Weight
498.53200 g/mol
Category
Aromatic Hydrocarbons
Last updated
8/21/2026
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Physicochemical Properties

Melting Point88 - 90ºC
Boiling Point590.3ºC at 760mmHg
Flash Point390.9ºC
Exact Mass498.18800
PSA45.64000
LogP5.77230

GHS Safety & Compliance

IrritantSignal word: Warning
  • H315 — Causes skin irritation
  • H319 — Causes serious eye irritation
  • H335 — May cause respiratory irritation

Customs & Trade Information

HS Code2932999099
Summary2932999099. other heterocyclic compounds with oxygen hetero-atom(s) only. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of (-)-2,3-O-Isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane?

The CAS number of (-)-2,3-O-Isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane is 32305-98-9.

What are the molecular formula and molecular weight of (-)-2,3-O-Isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane?

(-)-2,3-O-Isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane has molecular formula C31H32O2P2 and molecular weight 498.53200 g/mol.

Is (-)-2,3-O-Isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane hazardous?

(-)-2,3-O-Isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.

What are the upstream and downstream products of (-)-2,3-O-Isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane?

For (-)-2,3-O-Isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane, Upstream Products: (-)-1,4-Di-O-tosyl-2,3-O-isopropylidene-L-threitol, (4S,5S)-2,2-Dimethyl-1,3-dioxolane-4,5-dimethanol, Diethyl (4R,5R)-2,2-dimethyl-1,3-dioxolane-4,5-dicarboxylate.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated:

How to cite: Jingsj. "(-)-2,3-O-Isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane (CAS 32305-98-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-25557-2 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.