5-thiocyanato, oxidation with

On the other hand, the reverse trends exhibited by Eu+2 and Fe+2 as reductants imply in part that we are gaining more from the increasing stability of the bond being formed as we go from Br to F than we are losing from the stability of the bond being broken. I think this is also pertinent to the question of comparison of azido and thiocyanato complexes. With Co(CN)fz as reductant, the stable form of the product complex is sulfur-bonded, so that the orientation of the ligand in the oxidant is favorable for remote attack on the sulfur end, whereas the situation is unfavorable for Cr+2 and Fe+2 as reductants. 

Purine, 9- -D-ribofuranosyl-6-selenoxo- 1,6-dihydro-synthesis, 5, 597 Purine, 6-thiocyanato-acylation, 5, 559 Purine, 2-thioxo-synthesis, 5, 589 Purine, 8-thioxo-iodination, 5, 559 synthesis, 5, 577, 597 Purine, 2-thioxo-2,3-dihydro-synthesis, 5, 572 Purine, 6-thioxo-1,6-dihydro-acylation, 5, 559 dethiation, 5, 558 halogenation, 5, 559 hydrolysis, 5, 560 methylation, 5, 535 oxidation, 5, 560 synthesis, 5, 572, 596 Purine, 8-thioxo-7,8-dihydro-acylation, 5, 559 Purine, 2,6,8-trichloro-alkylation, 5, 530 amination, 5, 562 reactions, 5, 561, 562 with hydriodic acid, 5, 563 with pyridine, 5, 562 synthesis, 5, 598 Purine, 2,6,8-trichloro-7-methyl-synthesis, 5, 557 Purine, 8-trifluoromethyl-synthesis, 5, 574... 

The first sesquiterpene thiocyanate to be isolated from a marine sponge was (15, 45, 65, 7/ )-4-thiocyanato-9-cadinene (253) from Trachyopsis aplysinoides. The structures of this compound and of an isothiocyanate with a new carbon skeleton (254), were determined by X-ray analysis and two additional isothiocyanates (255-256) were identified [258]. Isothiocyanate 254 was synthesised using an oxidative radical cyclisation reaction as a key step [259]. 

Ethylene oxide, propylene oxide, and isobutylene oxide yield P-thiocyanato alcohols on treatment with ioe-eold, slightly acidifo-d solutions of ammonium or potassium iaothiooyanate.1408-,7IS Those... 

Bis(2,4-pentanedionato)oxovana-dium(IV), 5 113-115 Bis(8-quinolinolato)dioxouranium-(VI), and its addition compound with 8-quinolinol, 4 101 Jrans-Bis (thiocyanato)bis (ethylene-diamine)chromium(III) thiocyanate, 2 200, 202 Bis(triphenylgermyl)oxide, 5 78 Bis[tris(2,4-pen tanediono)titanium-(IV) jhexachlorotitanate(I V), 2 119... 

Whereas the previous discussion has been concerned with cobalt(II) and (III) compounds, the coordination of NCS toward cobalt in a formally lower oxidation state is illustrated by the isolation of [Co(NO)2-L(NCS)] [L = PhgP, PhgAs, (CgHulgP] with terminal A-thiocyanato groups and of [Co(NO)2(NCS)]2 with —SCN— bridges 89). 

Treatment of the solutions obtained by boiling mixtures of diaryl tellurium dichlorides and water or treatment of aqueous solutions of diaryl tellurium hydroxide chlorides with sodium thiocyanate gave rise to bis[diorgano thiocyanato tellurium] oxides ... 

Substituents which are capable of activating both electrophilic and nucleophilic substitution have been termed pan-activating and the azido group falls into this category, together with such structural units as aromatic iV-oxide, arylazo, azoxy, thiocyanato, nitroso and phenyl. 

Relatively little work has been done on the redox reaction between thallium and halide/pseudohalide ions (75, 93, 97,110, 328-330). Let us consider the qualitative order of stability of thallium(III) in the form of TlXp " complexes, where X = Cl, Br, I, SCN, CN, Thallium(III) forms strong complexes with all these ligands on the other hand, it can oxidize the X ions to X2. It is well known that the thallium(III) chloride complexes are perfectly stable for an indefinite period of time. The corresponding bromide complexes are usually stable, but at low Br/Tl ratios Tl(III) can be reduced by Br the reduction is easily prevented by adding excess of bromine. The iodo and thiocyanato complexes are approximately equally unstable toward redox reaction Tl(III) is rapidly reduced by the anion.Finally, the cyano complexes... 

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