5α-Pregnane-3α,20α-diol

Also known as: Allopregnanediol, Allopregnane-3α,20α-diol, (3α,5α,20S)-Pregnane-3,20-diol, 3α,20α-Dihydroxy-5α-pregnane, 5alpha-Pregnane-3alpha,20alpha-diol, (3R,5S,8R,9S,10S,13S,14S,17S)-17-[(1S)-1-hydroxyethyl]-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-ol

5α-Pregnane-3α,20α-diol (CAS 566-58-5) is a compound in the Alcohols category listed in the Jingsj chemical database. It has the molecular formula C21H36O2 and a molecular weight of 320.50900 g/mol. Key properties include a melting point of 240-242ºC, a boiling point of 435.9ºC at 760mmHg, a density of 1.053g/cm3 and a flash point of 191ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 566-58-5
Jingsj CID: J-1472770-9
Molecular Formula: C₂₁H₃₆O₂
Molecular Weight: 320.50900 g/mol
Category: Alcohols
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	240-242ºC
Boiling Point	435.9ºC at 760mmHg
Density	1.053g/cm3
Flash Point	191ºC
Exact Mass	320.27200
PSA	40.46000
LogP	4.38700
Refractive Index	1.531

Frequently Asked Questions

What is the CAS number of 5α-Pregnane-3α,20α-diol?

The CAS number of 5α-Pregnane-3α,20α-diol is 566-58-5.

What are the molecular formula and molecular weight of 5α-Pregnane-3α,20α-diol?

5α-Pregnane-3α,20α-diol has molecular formula C21H36O2 and molecular weight 320.50900 g/mol.

What are the upstream and downstream products of 5α-Pregnane-3α,20α-diol?

For 5α-Pregnane-3α,20α-diol, Downstream Products: 5α-Dihydroprogesterone.

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

Last updated: 8/21/2026

How to cite: Jingsj. "5α-Pregnane-3α,20α-diol (CAS 566-58-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1472770-9 (accessed 2026-11-09).

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