摘要:
The invention is a process for coupling 2-naphthols which comprises contacting 2-naphthols dissolved in a polar acidic solvent in the presence of a catalytic amount of a catalyst which comprises a readily reducible form of a Group IB, Group VIII or manganese metal in the further presence of oxygen or a source of oxygen, under conditions such that 1,1'-bi-2-naphthol is prepared.
摘要:
A 2,3-dihalopropanol is made by reacting 2,3-dihalopropanal with a hydrogenating agent in the presence of a transition metal-containing catalyst, under conditions such that 2,3-dihalopropanol is formed. The reaction is particularly useful as Step (3) in a process to make epihalohydrin by: (1) reacting a 3-carbon hydrocarbon with an oxidizing agent to form acrolein; (2) reacting acrolein with a molecular halogen to form 2,3-dihalopropanal; (3) reducing 2,3-dihalopropanal to form 2,3-dihalopropanol; and (4) cyclizing 2,3-dihalopropanol to make epihalohydrin. The process produces epihalohydrin using only about one mole of halogen per mole of epihalohydrin. It also uses substantially less water than existing processes.
摘要:
Substituted thiadiazoles which correspond to the formula: ##STR1## wherein X and Y each independently represents --Br, --Cl, --OCH.sub.3, --SCN, --OCH.sub.2 SCN, --SCH.sub.2 SCN, --OCH.sub.2 CH.sub.2 SCN or --SCH.sub.2 CH.sub.2 SCN, provided that at least one of X or Y represents --SCN, --OCH.sub.2 SCN, --SCH.sub.2 SCN, --OCH.sub.2 CH.sub.2 SCN or --SCH.sub.2 CH.sub.2 SCN are disclosed.These compounds have been found to exhibit antimicrobial and marine antifouling activity in industrial and commercial applications and compositions containing these compounds are so employed.
摘要:
Various 4,5-dimercapto-1,3-dithiolo-2-one or thione maleimides corresponding to the formula ##STR1## wherein R represents --H, phenyl, benzyl, phenethyl, a C.sub.1 -C.sub.10 straight or branched chain alkyl radical, a C.sub.3 -C.sub.10 cycloalkyl radical, a C.sub.1 -C.sub.10 straight or branched chain alkoxy radical, a C.sub.3 -C.sub.10 cycloalkoxy, an ester of the formula --CH.sub.2 CH.sub.2 O--C(O)--R.sup.1, wherein R.sup.1 represents a C.sub.1 -C.sub.5 straight or branched chain alkyl radical or a C.sub.3 -C.sub.5 cycloalkyl radical and Z represents oxygen or sulfur are disclosed.These compounds have been found to exhibit antimicrobial and marine antifouling activity in industrial and commercial applications and compositions containing these compounds are so employed.
摘要:
A process for preparing a substituted or unsubstituted 3- or 4-hydroxyalkylbenzocyclobutene compound comprises reducing a corresponding 3- or 4-formyl or ketobenzocyclobutene compound with a hydride at a temperature below that at which dimerization or oligomerization of the formyl- or ketobenzocycloutene compound or the thus-produced hydroxyalkylbenzocyclobutene compound is a significant side reaction, for a time sufficient to convert the formyl- or ketobenzocyclobutene compound to the hydroxyalkylbenzocyclobutene compound. In a two-step process, formylbenzocyclobutenes are prepared from bromobenzocyclobutenes in 90% yield or from benzocyclobutenes in a 70% yield, and then converted to hydroxymethylbenzocyclobutenes for an overall yield of about 85% from a bromobenzocyclobutene or of about 65% from a benzocyclobutene. In a two-step process, ketobenzocyclobutenes from bromobenzocyclobutene Grignard reagents and an N-alkanoyl- or N-aroyl-2-methylaziridine are converted to hydroxyalkylbenzocyclobutenes in high yields.
摘要:
Hydroxy-functional poly(ether sulfonamides) prepared by polymerizing an N,N'-dialkyl or N,N'-diaryldisulfonamide with a diepoxide in the presence of a suitable catalyst exhibit high barrier properties. These are suitable for use in the manufacture of articles such as rigid containers and flexible films exhibiting high barrier to oxygen.
摘要:
1-Chloro-3,5-difluorobenzene is chlorinated to give 4,6-difluoro-1,2,3-trichlorobenzene which in turn is nitrated and reduced to the corresponding novel aniline, 2,6-difluoro-3,4,5-trichloroaniline. Further reduction of this aniline provides 2,6-difluoroaniline with high selectivity.
摘要:
The preparation of 3,5,6-trichloropyridin-2-ol from trichloroacetyl chloride and acrylonitrile is improved by separately conducting the individual addition, cyclization and aromatization steps. By separating the steps, water and HCl, by-products of the latter steps, can be precluded from interfering with the earlier steps. The individual process steps have also been improved.
摘要:
3,4-Difluorobenzotrifluoride is prepared by contacting a 3,4-dihalobenzotrifluoride with an effective amount of KF or CsF in a polar aprotic solvent at an elevated temperature under substantially anhydrous conditions. The product can be removed as it is formed or the reaction may be run at the autogenous pressures generated by the reaction mixture in a sealed reactor.