Not to be confused with
XPhos.
Xantphos is an organophosphorus compound derived from the heterocycle xanthene. It is used as a bidentate diphosphine ligand and is noteworthy for having a particularly wide bite angle (108°).[1] Such ligands are useful in the hydroformylation of alkenes.[2] Illustrative of its wide bite angle, it forms both cis and trans adducts of platinum(II) chloride. In the latter context, xantphos is classified as a trans-spanning ligand. A related bidentate ligand with a greater bite angle is spanphos.
Quick Facts Names, Identifiers ...
Xantphos
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Names |
Preferred IUPAC name
(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphane) |
Other names
Xantphos |
Identifiers |
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ChemSpider |
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ECHA InfoCard |
100.118.008 |
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UNII |
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InChI=1S/C39H32OP2/c1-39(2)33-25-15-27-35(41(29-17-7-3-8-18-29)30-19-9-4-10-20-30)37(33)40-38-34(39)26-16-28-36(38)42(31-21-11-5-12-22-31)32-23-13-6-14-24-32/h3-28H,1-2H3 Y Key: CXNIUSPIQKWYAI-UHFFFAOYSA-N Y InChI=1/C39H32OP2/c1-39(2)33-25-15-27-35(41(29-17-7-3-8-18-29)30-19-9-4-10-20-30)37(33)40-38-34(39)26-16-28-36(38)42(31-21-11-5-12-22-31)32-23-13-6-14-24-32/h3-28H,1-2H3 Key: CXNIUSPIQKWYAI-UHFFFAOYAQ
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O6c1c(cccc1P(c2ccccc2)c3ccccc3)C(c7cccc(P(c4ccccc4)c5ccccc5)c67)(C)C
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Properties |
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C39H32OP2 |
Molar mass |
578.62 g/mol |
Appearance |
colorless solid |
Density |
1.34 g/mL |
Melting point |
224 to 228 °C (435 to 442 °F; 497 to 501 K) |
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organic solvents |
Hazards |
Occupational safety and health (OHS/OSH): |
Main hazards |
flammable |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Close
The ligand is prepared by double directed lithiation of 9,9-dimethylxanthene with sec-butyllithium followed by treatment with chlorodiphenylphosphine.[3]