Abstract: Novel copolymer resins having the repeating unit ##STR1## WHEREIN EACH R is independently alkyl of 1 to about 10 carbon atoms or halogen, z is oxygen or sulfur, the dashed line is an optional chemical bond, the group represented by z taken with the dashed line represents dibenzofuran and dibenzothiophene moieties, or mixtures thereof, each R" is hydrogen or ##STR2## wherein each R' is a hydrocarbon or substituted hydrocarbon radical of from 2 to about 11 carbon atoms, n averages about 3-10, each m is 0-2 and p and q are each 0 or 1 with the proviso that the sum of p and q has an average value of 0.1-1.0 and there is an average of at least one carboxyl group per polymer molecule, are prepared by reacting a mixture comprising a hydroxymethylated diphenylether-formaldehyde copolymer with an anhydride of the formula ##STR3## wherein R' is a hydrocarbon or substituted hydrocarbon radical of from 2 to about 11 carbon atoms, at a temperature between about 120.degree. and about 170.degree. C.

Abstract: A new process for preparing .gamma.-halonitriles comprising reacting by contacting a 1,3-dihalopropane, such as 1-chloro-3-bromopropane, or mixtures thereof, such as 1-chloro-3-bromopropane and 1-chloro-3-iodopropane, with an alkali metal cyanide, such a sodium cyanide, in the presence of an onium salt, such as benzyltriethylammonium chloride, and an alkali metal halide, such as sodium chloride. The .gamma.-halonitriles are useful in preparing cyclopropylcyanide, a herbicide intermediate.

Abstract: Heat transfer agents containing at least about 20 volume percent of diphenyl oxide and at least 20 volume percent of diphenylyl phenyl ether, polyphenyl ether or mixtures thereof have been found to be excellent heat transfer fluids with an unexpectedly broad range of liquidity.