3.5-Dihydroxy-3,5-dimethyl-1.2-dioxolane

The thermal decomposition of 3,5-dihydroxy-3,5-dimethyl-l,2-dioxolan (28) in glacial acetic acid or water at 110° is very complex, and leads to the following products acetic acid (60%), lactic acid (13%), propionic acid (6%), carbon dioxide (6%), acetylacetone (10%), methane (5%), carbon monoxide (2%), formic acid (1%), 3,5-diacetylheptane-2,6-dione (0.4%), and a mixture of acetone, methyl ethyl ketone, acetaldehyde, and methylglyoxal.89,40... 

Addition is usually the main process and products are isolated in good yields. In one particular case reported in 1997, the nonstereoselective 1,2-aIkylation of dimethyl malonate on the monoepoxide derived from cM-l,2-dihydroxy catechol has been explained by electronic and steric effects of the bulky side chain dioxolane ring. One can say that almost every vinyl epoxide is a good electrophile for Pd-catalyzed alkylations. The possible variation around the metal center and the tolerance toward aqueous or organic solvents extend the long list of nucleophiles available for C—C bond formation. 

DIOP 2,3-0-isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane = [(2,2-dimethyl-1,3-dioxolane-4,5diyl)bis (methylene)]bis[diphenylphosphine]... 

Dimethyl-2,5-dihydroxy-3-hexyne. See Dimethyl hexynediol DimethyMioctadecylammonium chloride. See Distearyidimonium chloride DimethyMioctyl ammonium chloride. See Dioctyl dimonium chloride 1,4-Dimethyl-3,6-dioxa-1-heptanol. See PPG-2 methyl ether 2,2-Dime%l-1 >dioxolane-4-methanol... 

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