Errata

A novel palladium compound, (Ph₃P)Pd(Cl)(CH₂SCH₃), was prepared in which the CH₃SCH₂ group acts as a chelate ligand; the stereochemically non-rigid property of (Ph₃P)Pd(CH₂SCH₃)[S₂CN(CH₃)₂] was also discussed in terms of the ligating effect of sulfur in this group.     

Carbocyclization by homolytic substitution (SH′ process). A new route to dihydroindole or dihydrobenzofuran

N-(4-Phenylthio-2-butenyl)-2-bromoaniline reacted with tributyltin hydride to give 3-vinyl-2,3-dihydroindole in 96% yield via hitherto unknown intramolecular S_H′ process, some other examples and remarkable dilution effect on these homolytic carbocyclizations were described.     

A novel synthesis of 2-arylaminothiazolo[4,5-d]pyridazinones

The reaction of 5(4)-amino-4(5)-chloropyridazin-3(2H)-ones 1 (9 ) with methyl dithiocarbamates 2 gave 2-arylaminothiazolo[4,5-d]pyridazinones 3 (10 ). Treatment of 5(4)-alkylamino-4(5)-chloropyridazin-3(2H)-ones 5 (12 ) with 2 afforded the corresponding 2-aryliminothiazolo[4,5-d]pyridazinones 6 (13 ). Cyclization of 1a with phenylisothiocyanate produced 2-amino- and 2-iminothiazolo[4,5-d]pyridazinones 3a and 16 .     

Preparation of polymers containing 1,4-dihydronicotinamide structure and their use in the reduction of vicinal tricarbonyl compounds

The definite polymers containing 1,4-dihydronicotinamide structure were prepared by reduction with sodium dithionite-potassium carbonate in the presence of benzyltriethylammonium chloride. The reduction of vicinal tricarbonyl compounds such as alloxan and ninhydrin by polymers having the 1,4-dihydronicotinamide moiety was performed to isolate the polymers' trapped radical anion of alloxan or ninhydrin.     

Stannes in synthesis: A new route to 2-substituted-1,3-butadienes via stereoselective allyltin formation under homolytic conditions

α-(Hydroxymethyl) allyl tolylsulfones reacted with tributyltin hydride in the presence of azobisisobutyronitrile (AIBN) in refluxing benzene to give a allyltin derivatives which subsequently gave 2-substituted1,3-butadienes upon distillation in good yield.     

Production of a poly(pyridinyl radical) by reduction with 1-benzyl-1,4-dihydronicotinamide and N,N′-dicyclohexylalloxan

It was found that 1-ethyl-4-carbomethoxypyridinium iodide could be reduced by 1-benzyl-1,4-dihydronicotinamide (BNAH) and N,N′-dicyclohexylalloxan (DCA) to give 1-ethyl-4-carbomethoxypyridinyl radical. The stable poly(pyridinyl radical) (P-III) was obtained in a similar manner by the reduction of poly(pyridinyl salt) (P-II).     

Deoxygenation of allylic alcohols to terminal olefins via stannylation/destannylation

Deoxygenation of allylic alcohols to terminal olefins was performed via three steps; 1) [3,3]-sigmatropic rearrangement of O-allylxanthates, 2) the successive stannolysis with tributyltin hydride yielding allylic stannanes, and 3) final protolysis of allylic stannanes to terminal olefins.