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:
A 2,3-dihalopropanol is made by reacting 2,3-dihalopropanal with molecular hydrogen in the presence of a transition metal-containing catalyst, under conditions such that 2,3-dihalopropanol is formed. The reaction is particularly useful, for example, as Step (3) in a process to make epihalohydrin which may be generally prepared 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 with molecular hydrogen 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:
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:
The invention is a bis-BCB compound of the structure: ##STR1## a method for making same and polymers made therefrom. The novel compounds of this invention are useful in preparing polymers that can form thin film coatings for multichip midules (MCMs) and integrated circuits (ICs). These compounds can be isolated as liquids at room temperature, and can form polymers that are hydrophobic and have low dielectrical and dissipative properties.
摘要:
A process for preparing carboxylic acid esters of of the formulaX--(COOCH.sub.2 A).sub.nwherein A is the residue of a substituted or unsubstituted 3- or 4-benzocyclobutene compound, X is an n-valent organic bridging group, and n is 2,3, or 4, comprises reacting a substituted or unsubstituted 3- or 4-hydroxymethylbenzocyclobutene compound with a compound of the formula X--(COY).sub.n, wherein X is an n-valent organic bridging group and Y is Cl or Br. Esters of inorganic acids of the formulaX'(OCH.sub.2 A).sub.nwherein X' is a residue of an inorganic acid halide, n is 2 or 3, and A is the residue of a substituted or unsubstituted 3- or 4-benzocyclobutene compound, are prepared by reacting an inorganic halide of the formula X'Y.sub.n, wherein Y is Br or Cl, with a substituted or unsubstituted 3- or 4-hydroxymethylbenzocyclobutene compound. Biscarbonates of the formula X"[OC(.dbd.O)CH.sub.2 A].sub.2 wherein X" is the residue of a diphenol are prepared by reaction between a bis(halocarbonyl) compound of the formula X"[OC(.dbd.O)Y].sub.2, wherein Y is Cl or Br, and a substituted or unsubstituted 3- or 4-hydroxymethylbenzocyclobutene compound. The resulting esters are useful for making resins.
摘要:
An improved process for the nitration of a substituted or unsubstituted benzocyclobutene compound in a reaction mixture comprising a nitrating agent, an unhalogenated carboxylic acid anhydride, clay and a solvent to produce a corresponding nitrobenzocyclobutene compound, is that wherein:(a) the solvent has a density above that of the nitrating agent or an extractable precursor thereof;(b) the reaction mixture is heated at a temperature such that solvent is removed from the reaction mixture to a site outside the reaction mixture to extract nitrating agent or extractable precursor thereof; and(c) the thus-extracted nitrating agent or precursor thereof is fed into the reaction mixture to nitrate the benzocyclobutene compound.
摘要:
3-chloromethylbenzocyclobutene is prepared by reacting benzocyclobutene with chloromethyl methyl ether in the presence of stannic chloride at a temperature of about -120.degree. C. to about -40.degree. C. and neutralizing the resulting reaction mixture comprising 3-chloromethylbenzocyclobutene at a temperature of about -80.degree. C. to about -70.degree. C.
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.