CYCLOMETALATED COMPOUNDS OF PD(II) WITH PYRAZOLE DERIVATIVES - UNUSUAL DOUBLE PALLADATION OF DIARYLBIS(N-PYRAZOLYL)METHANES

被引：13

作者：

ALONSO, MT ^{[1
]}

JUANES, O ^{[1
]}

DEMENDOZA, J ^{[1
]}

RODRIGUEZUBIS, JC ^{[1
]}

机构：

[1] UNIV AUTONOMA MADRID, DEPT QUIM, E-28049 MADRID, SPAIN

来源：

JOURNAL OF ORGANOMETALLIC CHEMISTRY | 1994年 / 484卷 / 1-2期

关键词：

PALLADIUM; CYCLOMETALATION; BIS(CYCLOMETALLATION); 5-; 6-MEMBERED RINGS; PYRAZOLE;

D O I：

10.1016/0022-328X(94)87180-9

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Reaction between palladium(II) acetate and bis(arylpyrazolyl)methanes with two aryl groups 3-RC(6)H(4), 2a-c or the 3-RC(6)H(4) and one 5-RC(6)H(4), 3a-c (R = H, 3'-OCH3, or 2'-Br) 3a-c in refluxing acetic acid, affords metallacycles of stoichiometry LPd(2), with two different five- and six-membered palladacycles, one containing an aromatic carbon-metal bond and the other a pyrazole carbon-metal bond, repectively. Treatment of acetate-bridged palladacycles 5a-c and 6a-c with Tl(acac) yields monomeric products 7a-c and 8a-c of formula [LPd(2)(acac)(2)]. The products have been characterized by elemental analysis (C, H, N) and NMR spectroscopy. The preferential formation of a six-membered metallacycle in the first step of the reaction is discussed.

引用

页码：19 / 26

页数：8

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