The reaction of 1,3,5-triiodomesitylene (C 6 Me 3 I 3 ) with a mixture of [Pd(dba) 2 ] and PR 3 leads to the mononuclear complexes trans-[Pd(C 6 Me 3 I 2 )I(PR 3 ) 2 ] (R ) Ph (1), R 3 ) Me 2 Ph (2)) or the dinuclear complex [{trans-PdI(PMe 2 Ph) 2 } 2 (µ 2 -C 6 Me 3 I)] (3), depending on the nature of the phosphine, the temperature, and the molar ratio of the reagents. All attempts to prepare trinuclear complexes, using this method of synthesis, were unsuccessful. However, addition of C 6 Me 3 I 3 to a mixture of [Pd(dba) 2 ] and L 2 gives at room temperature [(PdIL 2 ) 3 -(µ 3 -C 6 Me 3 )] (L 2 ) 2,2′-bipyridine (bpy) (4), 4,4′-di-tert-butyl-2,2′-bipiridine (tbbpy) (5)), even if substoichiometric amounts of Pd were used. Complex 5 does not react with PPh 3 or PMe 2 -Ph, but it does react with PMe 3 to give [trans-{PdI(PMe 3 ) 2 } 3 (µ 3 -C 6 Me 3 )] (6). The crystal structures of 1, 2, and 5 have been determined by X-ray diffraction studies.

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reactions of organo-metal compounds reactions of organo-metal compounds O 0350 12 -076 Arenediazonium Tetrachlorocuprates(II). Modification of the Meerwein and Sandmeyer Reactions. -In connection with an earlier work a general method for the preparation of the title salts (II) and their useful transformation to compounds such as (IV) and (V) is presented. -(OBUSHAK, MYKOLA D.; LYAKHOVYCH, MYKHAYLO B.; GANUSHCHAK, MYKOLA I.; Tetrahedron Lett. 39 (1998) 51, 9567-9570; Dep. Org. Chem., L'viv State Univ., L'viv 290602, Ukraine; EN)