Tris(2,4,6-trimethoxyphenyl)phosphine

Tris(2,4,6-trimethoxyphenyl)phosphine
Names
	IUPAC name Tris(2,4,6-trimethoxyphenyl)phosphane
	Other names Tris(2,4,6-trimethoxyphenyl)phosphine; TTMPP;
Identifiers
CAS Number	91608-15-0;
3D model (JSmol)	Interactive image;
ChemSpider	11283;
EC Number	811-745-3;
PubChem CID	522987;
CompTox Dashboard (EPA)	DTXSID60335128 ;
	InChI InChI=1S/C27H33O9P/c1-28-16-10-19(31-4)25(20(11-16)32-5)37(26-21(33-6)12-17(29-2)13-22(26)34-7)27-23(35-8)14-18(30-3)15-24(27)36-9/h10-15H,1-9H3 Key: JQKHNBQZGUKYPX-UHFFFAOYSA-N;
	SMILES COC1=CC(=C(C(=C1)OC)P(C2=C(C=C(C=C2OC)OC)OC)C3=C(C=C(C=C3OC)OC)OC)OC;
Properties
Chemical formula	C27H33O9P
Molar mass	532.526 g·mol−1
Melting point	79–81 °C (174–178 °F; 352–354 K)
Boiling point	360 or 377 °C (680 or 711 °F; 633 or 650 K)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Tris(2,4,6-trimethoxyphenyl)phosphine (TTMPP) is a large triaryl organophosphine whose strong Lewis-basic properties make it useful as an organocatalyst for several types of chemical reactions.

Reactions

TTMPP removes the trimethylsilyl group from ketene silyl acetals (the enol ether of esters) to give enolates that can then act as strong nucleophiles. It thus serves as a catalyst for Mukaiyama aldol reactions^[2] and group-transfer chain-growth polymerization reactions.^[3]

As a Brønsted base, TTMPP can deprotonate various alcohols, giving nucleophilic alkoxides that can undergo Michael addition reactions.^[4]

TTMPP can act as a Michael nucleophile itself to catalyze Baylis–Hillman reactions.^[5]

TTMPP is used as a ligand to form palladium-phosphine catalysts which are more reactive than triphenylphosphine-based catalysts.^[6]

^ Various chemical catalogs give one or the other value (see ChemSpider for collected list)
^ Matsukawa, Satoru; Okano, Naoko; Imamoto, Tsuneo (2000). "Phosphine catalyzed aldol reaction between ketene silyl acetals and aldehydes: nucleophilic O–Si and C–Si bond cleavage by phosphines". Tetrahedron Letters. 41 (1): 103–107. doi:10.1016/S0040-4039(99)02014-6.
^ Fevre, Maréva; Vignolle, Joan; Heroguez, Valérie; Taton, Daniel (2012). "Tris(2,4,6-trimethoxyphenyl)phosphine (TTMPP) as Potent Organocatalyst for Group Transfer Polymerization of Alkyl (Meth)acrylates". Macromolecules. 45 (19): 7711–7718. Bibcode:2012MaMol..45.7711F. doi:10.1021/ma301412z.
^ Fischer, Susanne M.; Kaschnitz, Petra; Slugov, Christian (2022). "Tris(2,4,6-trimethoxyphenyl)phosphine – a Lewis base able to compete with phosphazene bases in catalysing oxa-Michael reactions". Catalysis Science & Technology. 12 (20): 6204–6212. doi:10.1039/D2CY01335E.
^ Trofimov, Alexander; Gevorgyan, Vladimir (2009). "Sila-Morita−Baylis−Hillman Reaction of Arylvinyl Ketones: Overcoming the Dimerization Problem". Organic Letters. 11 (1): 253–255. doi:10.1021/ol8026522. PMID 19055398.
^ Miyaura, Norio; Suzuki, Akira (1995). "Palladium-Catalyzed Cross-Coupling Reactions of Organoboron Compounds". Chemical Reviews. 95 (7): 2457–2483. doi:10.1021/cr00039a007. hdl:2115/44007.