Cobalt(II) complexes of “mixed” nitrogen–phosphorus cationic ligands

Abstract

Swmmmary Cobalt (11) dihalides form inorganic zwitterionComplexes of the type [COX,-L+] where X = C1, Br, I, and L is the 2-(diphenylphosphino) ethyldialkylammonium

Platinum(II) and palladium(II) metallomacrocycles derived from cationic 4,4′-bipyridinium, 3-aminopyrazinium and 2-aminopyrimidinium ligands

“…This change in chemical shift is diagnostic of coordination of 2 2+ to the electrophilic metal centre and is consistent with, but not necessarily indicative of, dinuclear complex formation. The NMR data for the other complexes (11)(12)(13) were also consistent with their proposed structures but while NMR analysis can often confirm the symmetry of metallosupramolecular species, it provides no evidence regarding nuclearity. 23 ESI-MS analysis was used to provide some insight into the nuclearity of the complexes but was unsuccessful when the nitrate salts were used; only smaller cationic fragments were detected.…”

“…The precipitate was isolated by filtration, washed with cold H 2 O (0.5 mL) and dried in vacuo to give the product as an off-white solid (17.7 mg, 73%). 1 (12). The title compound was prepared in a similar manner to 10, using 3•2NO 3 instead of the butane derivative (white powder, 17.2 mg, 69%).…”

Evidence that the production of acetate in rat hepatocytes is a predominantly cytoplasmic process

“…The method is based on that described by Taylor (1978). A 0.5 ml portion of each neutralized supernatant from HC104 extract B (i.e.…”

Synthesis of 2‐Cycloalkenones (Parts of 1,4‐Diacyl‐1,3‐butadiene Systems) and of a Heterocyclic Analogue by Metal‐Catalyzed Decomposition of 2‐Diazoacylfurans

“…Whereas the structure presented for the product was at odds with the name, 'trans-3-(cyclopent-2-enone-3yl)propenal', and no data substantiating the intermediacy of a tricyclic ketone F was in evidence, the report, nevertheless, gave a strong impetus to the following general study of metal-promoted decompositions of furan-attached diazo ketones. [3], prepared from 3-(2-furyl)propionic acid (3a) [4] by reaction with SOCl, in pyridine/Et,O and subsequently with ethereal diazomethane, to Rh,(OAc), in CH,Cl, solution at 0" gave, in less than 10 min, a crystalline keto aldehyde 5a in 80 O/ O yield, i.e. a substance identical in all respects with compound G reported earlier [3].…”

“…The following example of another diazo ketone decomposition is a cyclopentenoneproducing process, but one introducing greater structural complexity. Heating a xylene solution of 1,3-butadiene and the methyl ester 16 of 3-(2-furyl)acrylic acid [4] at 195" for 18 h yielded (70%) ester 17 whose hydrogenation over Pd afforded (92%) the dihydro derivative 18a. Base hydrolysis of the latter gave (91 YO) acid 18b.…”