Acetals 2.2- dimethyl propane 1,3 diol

An aq soln. of excess Ca-permanganate added dropwise with vigorous stirring at 0° to a soln. of 2,2-dimethyl-l,3-propanediol sulfite in glacial acetic acid-chloroform until the permanganate color persists 2,2-dimethyl-l,3-propane-diol sulfate. Y 71%.—The product could not be obtained directly from the diol. F. e. s. J. Lichtenberger and J. Hincky, Bl. 1961, 1495. 

Adipic acid dimethyi adipate (polyesters), acrylamide (acrylonitrile co-polymers), acrylonitrile (acrylamide co-polymers), acrylic acid (acrylic polymers), buta-1,3-dlene (PS co-polymers, elastomers), butan-1,4-diol (polyesters), 2,2-bis(4-hydroxyphenyl)butan-1-ol (polyesters), 1,1-bis(4-hydroxyphenyl)cyclohexane (polyesters), 4,4 -(propane-2,2-diyl)-dlphenol known as bisphenol A (polyesters), ethyleneglycol (polyestere), formaldehyde (phenol-formaldehyde resins), isophthalic acid (PET), caprolactame and C -C,2 aminocar-boxyllc acids and their lactames (polyamides), melamine (amino-formaldehyde resins), methacryllc acid and methyl methacrylate (acrylic polymers), methylstyrene (PS and co-polymers), propyleneglycol (polyesters), sebacic acid and dimethyl sebacate (polyesters), styrene (PS and co-polymers), terephthalic acid and dimethyl terephthalate (PET), vinyl acetate (vinyl acetate co-polymers), vinyl chloride (PVC and co-polymers), vinylldenechlorlde (PVdC and co-polymers)... 

The formation of cyclic acetals and ketals from alkane diols other than ethylene glycol has been investigated in some detail [30, 30a, 30b]. It was found that with ketones ease of ketal formation is in the order 2,2-dimethylpropane-l,3-diol > ethylene glycol > propane-1, 3-diol, and that stability to acid is greatest with the resulting 5,5-dimethyl-l,3-dioxans. In the case of the diketone (1) it has been foimd that mono-ketalization at the 1-keto-group was more selective with... 

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