Glycol dichloride

Chemical Designations - Synonyms Brocide 1,2-Dichlorethane Dutch liquid EDC Ethylene chloride Glycol dichloride Chemical Formula ClCHjCHjCl. 

The first method is shown in Eq. (3.1). This corresponds to the so-called one plus one synthesis of crowns. The notion is that a single diol unit is allowed to react with a single polyethylene glycol having leaving groups at each end. An example of this would be the synthesis of benzo-15-crown-5 from catechol and tetraethylene glycol dichloride. Note that the stoichiometry of this method is identical to that of method X which is shown below in Eq. (3.3). 

The second general approach outlined by Pedersen is the so-called method W in which the two hydroxyl groups are separated by a portion of the crown chain. A good example of this is the assembly of 18-crown-6 from triethylene glycol and triethylene glycol dichloride. 

At about the same time, Vogtle and Frensch reported the synthesis of a similar bis-crown based on the papaverine nucleus. This synthesis also was executed in the Williamson fashion using doubly-demethylated papaverine and tetraethylene glycol dichloride. The base, if used, was not specified but it was noted that the high dilution technique was not used. It was presumed that the major product was 10, shown below, but there was also evidence of other components, presumably 11 and 12. 

It is interesting to note that Kulstad and Malmsten have utilized yet another method for introducing nitrogen into the crown precursors. They utilize sodium azide in DMSO to displace halogen from triethylene glycol dichloride. The bis-azide is then reduced using hydrogen sulfide in ethanol. ... 

Synonyms AI3-01656 1,2-Bichloroethane Borer sol BRN 605264 Brocide Caswell No. 440 CCRIS 225 1,2-DCA 1,2-DCE Destruxol borersol Dichloremulsion 1,2-Dichlorethane Dichlormulsion a,p-Dichloroethane sjm-Dichloroethane Dichloroethylene Dutch liquid Dutch oil EDC EINECS 203-458-1 ENT 1656 EPA pesticide chemical code 042003 Ethane dichloride Ethene dichloride Ethylene chloride Ethylene dichloride 1,2-Ethylene dichloride Freon 150 Glycol dichloride HCC 150 NC1-C00511 RCRA waste number U077 UN 1184. 

Various alkyl-substituted crown ethers have been prepared by cyclic addition across a double bond (e.g. bromination (77S854) or oxymercuration (80CC925)). Similarly, displacement of oligoethylene glycol dichlorides by cyanamide yields V-cyano monoaza crown ethers (81TL4105). 

Synonym ethylene chloride, ethylene dichloride, glycol dichloride, sym-dichloroethane, Dutch oil, EDC... 

Synonyms Ethylene dichloride 1,2-Ethylene dichloride Glycol dichloride EDC sym-Dichloroethane 1,2-Dichloroethane Ethylene chloride. 

A macrocyclic dibenzobisamide system has also been studied. A bisamide-containing bis-phenol was first prepared quantitatively from a benzolactone and ethylenediamine. This bis-phenol was cyclized in 12-16% yields with either a glycol dichloride or a chlorohydrin (method T-7) (Ashby et al., 1974). 

Dryooterls A wide-spread genus of medium-sized ferns of the polypody family Ethylene chloride 4297 CH2CI.CH2CI Chloric ether Glycol dichloride. 

SYNONYMS ethylene dichloride, ethane-dichloride, ethyleendichloride, freon-150, glycol dichloride... 

SYNONYMS 1,2-dichloroethane, ethylene chloride, glycol dichloride. 

Fuel processing to recover plutonium was an important activity from the earliest days of the atomic energy program. A small pilot plant was built at CRNL in parallel with the construction of NRX. It operated from 1949 to 1953 to extract plutonium from dissolved fuel with triethylene glycol dichloride in a batch process. Ammonium nitrate was the salting-out agent (75). Subsequently, the waste solution from this operation was treated with tributylphosphate (TBP) to remove uranium and residual plutonium, and the ammonium nitrate decomposed before the waste was stored as a concentrated fission product solution. 

Synonyms/Trade Names 1,2-Dichloroethane Ethylene chloride Glycol dichloride... 

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