Gezielte Synthese von Sulfinato‐ O ‐ und ‐ S ‐Komplexen einiger Übergangsmetalle, XI. Bindungsisomerie bei Sulfinato‐Komplexen von Zink(II)

Abstract

GemiiB GI. (1) gelingt, ausgehend von den Sulfinato-0,O'-Komplexen (RS02)2Zn(OH2)2 (la, b), die schrittweise Addition von 2,2'-Bipyridyl, wobei die Mono-, Bis-und Tris(2,2'-bipyridy1)-Komplexe 2a, b, 3a, b und 4a, b entstehen. Im Falle der Bis(2,2'-bipyridyl)-Komplexe 3a, b wurden die bindungsisomeren Sulfinato-0-und -S-Komplexe 3 a 0 , 3 b 0 und3nS, 3 b S erhalten. AusQa, b IiiBt sich mit Aceton reversibel ein mol 2,2'-Bipyridyl g e d B GI. (7) unter Bildung von 3aO und 3 b 0 abspalten. Die neu dargestellten Verbindungen werden IRspektroskopisch charakterisiert. Im Falle von 4a, b sind DTA-, TG-und DTG-Messungen durchgefuhrt worden. Dhected SyntasiS of SuUhta-0 and -S Compkxes of some Tramition Metalp, XI11 Linkage Isomerbsl in SuIRmlto complexes of ziae(m Starting from the sulfinato-0,0' complexes (RS02)z Zn(OH&(la, b) the mono-, bis-, and tris(2,2'-bipyridyI) complexes 2a,b, 3n,b, and 4a.b are produced according to equation (1) by stepwise addition of 2,2'-bipyridyl. In the case of the bis(2,2'-bipyridyl) complexes 3% b the linkage-isomeric sulfinato-0 and -S complexes 3110, 3 b 0 , and 3aS. 3bS are obtained. From 4a, b 1 mole of 2,2'-bipyridyl can be eliminated reversibly with acetone according to equation (7) with formation of 3 n 0 and 3 b 0 . The newly prepared compounds were characterized on the basis of their i. r. spectra. In the case of 4a, b DTA, TG, and DTG measurements were carried out.Der RSOz--Rest gehort m den ganz wenigen besonders typisch ambivalenten Liganden, da er nicht nur ein-und zweizihig fungieren, sondern auch verschiedene Koordinationspartner anbieten h~. Die Strukturen von Sullhato-Komplexen werden durch die Filhigkeit der RSOz--Gmppe bestimmt, sowohl als einziihniger Ligand (Sulfinato-0-und -S)2-5) aufmtreten als sich auch zweizihig iiber beide Sauerstoff-1) X .

Photocatalytic Radical Alkylation of Electrophilic Olefins by Benzylic and Alkylic Zinc-Sulfinates

“…The use of a mixture 1:4 H 2 O and EtOH (entry 6) gave a lower conversion compared to a 4:1 (entry 7) or 1:1 (entry 8) that afforded favorable results, with the latter being the best solvent mixture. In order to improve the solubility of the zinc reagent, coordinating species able to bind this metal were also investigated (entries 9–11) . Unfortunately, the conversion was not improved even if zinc sulfinate seemed to be more soluble under such conditions.…”

Preparation and purification of zinc sulfinate reagents for drug discovery

“…It is of note that the prepared zinc sulphinate salts 3,4 are likely to be dihydrates in their solid state 5–8 (see Supplementary Information for details); while this does not affect the reagents’ reactivity, it affects the calculation of stoichiometry. It is also of note that the previously prepared reagents can contain up to one equivalent of zinc chloride (ZnCl 2 ) per equivalent of zinc sulphinate (see Supplementary Information for details).…”