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CAS indexed 79 chemical substances from this document.
CAS subject entries for this document include: Alkanes, reactions; Chelates; Transition metal complexes; and 10 additional concepts. | |
CAPLUS COPYRIGHT 2006 ACS on STN
| TITLE:
| Process for preparation of novel aryl-substituted N-heterocyclic carbene bis-2-imidazolylidene platinum and palladium chelate complexes as stable catalysts for partial oxidation of methane to methanol |
| INVENTOR(S):
| Strassner, Thomas; Ahrens, Sebastian; Zeller, Alexander |
| PATENT ASSIGNEE(S):
| Technische Universitaet Dresden, Germany |
| SOURCE:
| PCT Int. Appl., 65 pp. CODEN: PIXXD2 |
| LANGUAGE:
| German |
PATENT INFORMATION: PATENT NO. KIND DATE APPLICATION NO. DATE
--------------- ---- -------- -------------------- --------
WO 2006058535 A2 20060608 WO 2005-DE2200 20051130
W: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BW, BY, BZ, CA, CH,
CN, CO, CR, CU, CZ, DK, DM, DZ, EC, EE, EG, ES, FI, GB, GD, GE,
GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ,
LC, LK, LR, LS, LT, LU, LV, LY, MA, MD, MG, MK, MN, MW, MX, MZ,
NA, NG, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RU, SC, SD, SE, SG,
SK, SL, SM, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN,
YU, ZA, ZM, ZW
RW: AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE,
IS, IT, LT, LU, LV, MC, NL, PL, PT, RO, SE, SI, SK, TR, BF, BJ,
CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG, BW, GH,
GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW, AM, AZ, BY,
KG, KZ, MD, RU, TJ, TM
DE 102005058206 A1 20060608 DE 2005-102005058206 20051130
ABSTRACT:
Platinum and palladium bis-carbene complexes [[1,1'-RC3H2N2-3,3'-(CH2)nC3H2N2R-.kappa.C2,.kappa.C2']MX2] [1, C3H2N2 = imidazol-2-ylidene, M = Pd, Pt; X = halo, weak or non-coordinating anion; n = 1-4; R = alkyl, optionally substituted (N-hetero)aryl, preferably R = halophenyl, nitrophenyl, methoxyphenyl, mesityl, 2-pyrimidinyl], useful as catalysts for partial oxidn. of methane to methanol, stable in strong acid or oxidative solns., were prepd. by quaternization of 1-substituted imidazols with 1,.omega.-dihaloalkanes with subsequent reaction with palladium or platinum salts, preferably with PtCl2, Pd(OAc)2, Pt(acac)2, optionally including deprotonation of bis-imidazolium salts by KOtBu, NaN(SiMe3)2, or by transmetalation of in situ generated silver carbene complexes by (COD)MCl2 (COD = 1,5-cyclooctadiene). In an example, dibromo[1,1'-bis(2,6-diisopropylphenyl)-3,3'-methylenebisimidazolin-2,2'-diy lidene]palladium was prepd. by reaction of 1-(2,6-diisopropylphenyl)imidazol with CH2Br2 followed by metalation of the bis-imidazolium dibromide by 1 equiv of Pd(OAc)2 in DMSO at 40-130.degree. for 7 h. The prepd. bis-carbene chelate complexes were tested in methane partial oxidn., affording up to 25.3 TON in Me trifluoroacetate prodn. by reaction of CH4 at 30 atm with K2S2O8 in a mixt. of CF3CO2H with (CF3CO)2O at 90.degree. for 17 h.
Updated 5/11/2007 8:57:38 AM
