Interplay of bite angle and cone angle effects. A comparison between o-C<sub>6</sub>H<sub>4</sub>(CH<sub>2</sub>PR<sub>2</sub>)(PR′<sub>2</sub>) and o-C<sub>6</sub>H<sub>4</sub>(CH<sub>2</sub>PR<sub>2</sub>)(CH<sub>2</sub>PR′<sub>2</sub>) as ligands for Pd-catalysed ethene hydromethoxycarbonylation
作者:Tamara Fanjul、Graham Eastham、Joelle Floure、Sebastian J. K. Forrest、Mairi F. Haddow、Alex Hamilton、Paul G. Pringle、A. Guy Orpen、Mark Waugh
DOI:10.1039/c2dt31913f
日期:——
determined and show that the crystallographic bite angles and cone angles are greater for L1a1a than L3a3a3a. Solution NMR studies show that the seven-membered chelate in 1a is more rigid than the six-membered chelate in 2a. Treatment of [PtCl(CH3)(cod)] with L3a–f3a–f gave [PtCl(CH3)(L3a–f3a–f)] as mixtures of 2 isomers 3a–f and 4a–f. The ratio of the products 4 : 3 ranges from 100 : 1 to 1 : 20, the precise
制备了以下不对称二膦:o -C 6 H 4(CH 2 P t Bu 2)(PR 2)其中R =Pt Bu 2(L 3a 3a3a);PCg(L 3b 3b); PPh 2(L 3c 3c3c); P(o -C 6 H 4 CH 3)2(L 3d 3d3d); P(o -C 6 H 4OCH 3)2(L 3e 3e)和o -C 6 H 4(CH 2 PCg)(PCg)(L 3f 3f),其中PCg为6-phospha-2,4,8-trioxa-1,3,5, 7-四甲基金刚烷基-6-基。氢甲氧基羰基化乙烯在商业上相关的条件下,对每种配体L 3a–f 3a–f的Pd配合物进行了研究,并将结果与商业上使用的o -C 6 H 4(CH 2 P t Bu 2)进行了比较。2(L 1a 1a)。体积最大的配体的钯配合大号3A 3a3a,大号3B 3B和大号3F 3F是高活性的催化剂,但的钯配合大号3C