Abstract: The nuclear iodine substituents borne by an iodopyridine are displaced by introducing gaseous chlorine into the mixture at a temperature of from about 100.degree. C. to about 250.degree. C. The displacement of iodine produces chloropyridines, which can then be conveniently separated from the liberated iodine by conventional methods such as distillation.

Abstract: Novel compounds of the formula ##STR1## wherein --D-- is a methylene group which is a member of an oxetane or a 1,3-dioxane ring, --R-- is ethylene or propylene bearing from 0-6 methyl groups and m and n are lower integers. For example, a compound of the formula ##STR2## is contacted with dilute HCl to give a monomer ##STR3## which is copolymerized with a diisocyanate to give a copolymer which removes SO.sub.2 from gas streams.

Abstract: Novel linear, branched and cyclic polymers of the repeating unit ##STR1## wherein R is ethylene or propylene bearing from zero to six methyl groups and m and n are lower integers and a process for utilizing said polymers to extract salts from solution are disclosed. For example, a monomer of the formula ##STR2## is contacted with traces of water in the presence of BF.sub.3.etherate to give a homopolymer consisting essentially of repeating units of the formula ##STR3## which extracts sodium salts from aqueous solution in a thermally reversible manner.

Abstract: Vinylbenzyl ethers of polyphenolics such as bisphenol A and novolac resins comprise a new class of curable resins which have marked advantages over comparable types of resins. They have the greater ease of free-radical curing compared to epoxy resins. The cured resins have greater stability than polyester resins because of the lack of hydrolyzable groups, and they have high heat distortion temperatures. Additionally, the resins produce solutions of low viscosity with comonomers such as styrene.

Abstract: In the preparation of (poly)cyclic polyethers by a cyclic Williamson synthesis, the improvement of contacting the reactants in a hindered (C.sub.4 -C.sub.14) alkanol. For example, bis-chloroethyl ether and the disodium salt of tetraethylene glycol are contacted in t-butanol to produce the cyclic polyether ##STR1## in high yields.

Abstract: The preparation of the azide of a carboxylic acid by reacting the hydrazide of the acid with nitrous acid is facilitated by using the organic solvent-soluble complex of an alkali metal nitrite with an ethylene oxide or propylene oxide cyclic polymer as the nitrous acid source. The improvement is particularly useful as a means for making peptides by the coupling reaction of an amino acid ester or other derivative with an acid azide in an anhydrous reaction medium.

Abstract: Novel complexes between (a) a compound of the formula ##STR1## where R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently H or C.sub.1 -C.sub.3 alkyl; and (b), salts of one of the cations Li, Na, K, Rb, Mg, Ca, Sr, Mn (II), Mn (III), Fe (II), Fe (III), Cu (I), Cu (II), Ag (I), Zn (II), Sn (II), Au (I), Au (II), Hg (I), Hg (II), Ni (I), Ni (II), Co (II), Co (III), hydronium, ammonium alkylammonium and pyridinium; optionally with solvent molecules in the crystal lattice, which complexes are useful as sources of highly pure salts and as soluble sources of certain inorganic reagents, e.g., KMnO.sub.4, NaNO.sub.2, NaSCN, etc., in hydrocarbon systems. For example, a 1:2 complex of sodium chloride and [CH.sub.2 CH.sub.2 O] .sub.4 is formed with 5 molecules of water per sodium cation in the crystal lattice of the complex.

Abstract: Monomeric epoxides are purified by mixing with a hydrocarbyl alkali metal. The requisite amount of hydrocarbyl lithium is readily detectable by a change in color of a suitable indicator. The monomeric epoxide so purified can be rapidly and completely polymerized to yield high molecular weight homopolymers or copolymers.