The chemistry of CaII and YbII:: Astoundingly similar but not equal!

被引：164

作者：

Harder, S ^{[1
]}

机构：

[1] Univ Konstanz, Fachbereich Chem, D-78457 Constance, Germany

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2004年 / 43卷 / 20期

关键词：

alkaline-earth metals; lanthanicles; polystyrene; stereoselective polymerization;

D O I：

10.1002/anie.200353557

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Not a red/green stereographic, but a plot showing the striking similarity between a Ca and Yb complex. The molecular structures, and the NMR and IR spectra of these Ca/Yb benzyl complexes are nearly identical. However, their reactivity in styrene polymerization is completely different: an internally coordinated dibenzylytterbium (II) complex produces polystyrene of high syndiotacticity (r = 94.9%, rr = 90.0%).

引用

页码：2714 / 2718

页数：5

共 48 条

[11]

CARNALL WT, 1979, HDB PHYSICS CHEM RAR, pCH24

[12] The first example of a crystalline subvalent organolanthanum complex:: [K([18]crown-6)-(η2-C6H6)2][(LaCptt2)2(μ-η6:η6-C6H6)]•2C6H6 (Cptt = η5-C5H3But2-1,3) [J].

Cassani, MC ;

Duncalf, DJ ;

Lappert, MF .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1998, 120 (49) :12958-12959

[13] A half-sandwich perfluoroorganoytterbium(II) complex from a simple redox transmetalation/ligand exchange synthesis [J].

Deacon, GB ;

Forsyth, CM .

ORGANOMETALLICS, 2003, 22 (07) :1349-1352

[14] Alkyl derivatives of europium(+2) and ytterbium(+2). Crystal structures of Eu[C(SiMe(3))(3)](2), Yb[C(SiMe(3))(2)(SiMe(2)CH=CH2)]I center dot OEt(2) and Yb[C(SiMe(3))(2)(SiMe(2)OMe)]I center dot OEt(2) [J].

Eaborn, C ;

Hitchcock, PB ;

Izod, K ;

Lu, ZR ;

Smith, JD .

ORGANOMETALLICS, 1996, 15 (22) :4783-4790

[15] Synthesis and structural chemistry of non-cyclopentadienyl organolanthanide complexes [J].

Edelmann, FT ;

Freckmann, DMM ;

Schumann, H .

CHEMICAL REVIEWS, 2002, 102 (06) :1851-1896

[16] REACTIVITY OF (C5ME5)2SM WITH ARYL-SUBSTITUTED ALKENES - SYNTHESIS AND STRUCTURE OF A BIMETALLIC STYRENE COMPLEX THAT CONTAINS AN ETA-2-ARENE LANTHANIDE INTERACTION [J].

EVANS, WJ ;

ULIBARRI, TA ;

ZILLER, JW .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1990, 112 (01) :219-223

[17] THE ORGANOMETALLIC CHEMISTRY OF THE LANTHANIDE ELEMENTS IN LOW OXIDATION-STATES [J].

EVANS, WJ .

POLYHEDRON, 1987, 6 (05) :803-835

[18]

Fedushkin IL, 2001, ANGEW CHEM INT EDIT, V40, P2474, DOI 10.1002/1521-3773(20010702)40:13<2474::AID-ANIE2474>3.0.CO

[19]

2-0

[20] New stereochemical assignments of 13C NMR signals for predominantly syndiotactic polystyrene [J].

Feil, F ;

Harder, S .

MACROMOLECULES, 2003, 36 (09) :3446-3448

← 1 2 3 4 5 →