Potassium methylsulfinylmethylide

Potassium methylsulfinylmethylide, 329 Potassium methyl xanthate, 39 Potassium nitrite, 329 Potassium nitrosodisuifonate, 329-330 Potassium nonaflate, 441... 

Scheme XXXL Synthesis of the 2,7-epimeric analog of perhydrohistrionicotoxin and a 2,7-epi-dioxa analog (75). A i) Methyl acetoacetate dianion, hexamethylphosphoric triamide, ii) Pyrrolidine. B i) 0s04, ii) NaHSOa, iii) Ag2C03, iv) Triethylphosphonoacetate anion. C i)NH3. D i) Toluenesulphonic acid, ii)NaBH4, iii) Phosgene. E i) Al(i-Bu)2H, ii)Allyl-dimethylphenylphosphonium bromide, potassium methylsulfinylmethylide. F i) Pd/C, H2, ii) Li, CH3NH2. G i) LiBH4, ii) KH, C2H5I, iii) Li, CH3NH2...

In a detailed study of the generation of dicarbanions from /3-dicarbonyl compounds, Harris and Harris found that sodium amide is superior to potassium amide, sodium methylsulfinylmethylide, or sodium hydride. 

Cyclopropyldiphenylsulfonium tetrafluoroborates 89 are versatile three-carbon building blocks. " Upon reaction with base, e.g. sodium methylsulfinylmethylide in 1,2-dimethoxyethane or potassium hydroxide in dimethyl sulfoxide, these salts are converted into ylides 90 which readily react with ketones or acrylates to afford spiroepoxides 91 or spiro[2.2]pentane-l-carboxylates 92, respectively. -Similar reactions were observed with (dimethylamino)phenylsulfoxonium cyclopropylide. ... 

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