Methylene glycol, atmosphere

Several organic species (formaldehyde, formic acid, methanol, methyl-peroxide, etc.) are transferred from the gas to the aqueous-phase and contribute to the atmospheric aqueous-phase reaction system (Graedel and Weschler, 1981). The complex formation by S(IV) and aldehydes has already been discussed. Formaldehyde is very soluble in water because it hydrates to its diol form, methylene glycol ... 

Ji-Methoxy-ll, 11-ethylenedioxy-lS-methylestra-1,3,5(lO)-tnene. A solution of (+)3-methoxy-18-methylestra-l,3,5(10)-trien-17-one (5 g) dissolved in ethylene glycol (5 ml) and ethyl orthoformate (10 ml) containing />-toluenesulfonic acid (0.3 g) is heated under reflux for 2 hr in a nitrogen atmosphere. The resulting solution is diluted with methylene chloride and washed with dilute sodium bicarbonate and water. The organic phase is dried over sodium sulfate and evaporated to dryness in the presence of a trace of pyridine. Trituration of the residue with petroleum ether yields 4.7 g (82 %) of the pure ketal. 

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