THE structures of π-allyl complexes of transition metal ions are of interest because the allyl ligand can be regarded as intermediate in behaviour between olefines and conjugated aromatic systems. π-Allyl palladium complexes have, in particular, assumed importance as catalytic agents in carbonylation and other reactions involving unsaturated organic halides1,2. The only structural analysis of an allyl complex so far reported is that of the dimeric π-allyl palladium chloride3, the reaction of this complex with silver acetate yielding π-allyl palladium acetate4. A three-dimensional X-ray analysis of the structure of this molecule has now been completed, the molecular stereochemistry being shown in Fig. 1; estimated standard deviations of the observed bond lengths are 0.003 Å (Pd–Pd), 0.02 Å (Pd–O), 0.035 Å (Pd–C), 0.04 Å (O–C) and 0.05 Å (C–C) and correspond to a discrepancy index of 0.068 for 1,065 reflexions.

中文翻译：

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π-烯丙基-乙酸钯的分子结构

过渡金属离子的 π-烯丙基配合物的结构是令人感兴趣的，因为烯丙基配体可以被视为烯烃和共轭芳烃系统之间行为的中间体。π-烯丙基钯配合物在羰基化和其他涉及不饱和有机卤化物的反应中作为催化剂具有重要意义1,2。迄今为止报道的烯丙基配合物的唯一结构分析是二聚 π-烯丙基氯化钯的结构分析，该配合物与乙酸银反应生成 π-烯丙基乙酸钯 4。该分子结构的三维 X 射线分析现已完成，分子立体化学如图 1 所示；观察到的键长的估计标准偏差为 0.003 Å (Pd-Pd)、0.02 Å (Pd-O)、0.035 Å (Pd-C)、0.04 Å (O-C) 和 0。