Hydro-hydroxy-elimination

Dehydration of Aldoximes and Similar Compounds C-Hydro-ZV-hydroxy-elimination... 

C-Hydro-A-hydroxy-elimination C-Acyl-A-hydroxy-elimination... 

Interposition of a methylene group between the phenyl ring and the heterocycle leads to the benzyldiami nopyrimidines, a class of compounds notable for their antibacterial activity. Condensation of hydrocinnamate 54 with ethyl formate leads to the hydroxymethylene derivative 55. In this case, too, the heterocyclic ring is formed by reaction with guanidine. This sequence probably involves initial addition-elimination to the formyl carbon to form 56 cyclization in this case involves simple amide formation. Tautomerization then affords the hydroxy derivative 57. This is converted to tetroxoprim (58) by first replacing the hydro) l by chlorine and then- displacement of halogen with ammonia. 

Pyrolysis of (3-Hydroxy Olefins O-Hydro-C-allyl-elimination... 

Free Radical Scavengers. Hindered phenolics are the most important free radical scavengers used in polypropylene. These compounds function by hydrogen transfer reactions involving labile hydroxy-hydro-gen atoms in the molecule. The results of hydrogen transfer reactions are elimination of active radicals, and formation of resonance-stabilized phenoxy radicals which do not react with weak bonds in the polymer chain. 

If l-hydroxy-2-oxa-4,6-dithioheptane-7-thiol is isolated and heated under vacuum, formaldehyde and hydro n sulfide are eliminated and poly(thioform-aldehyde) is formed. This can be done by heating the dithioheptane at 210° C for 6 h in vacuo. 

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