Abstract: A memory comprises a viologen which shows liquid crystalline properties, and a voltage more than 0.7 V is applied to the viologen so that the electric conductivity of the viologen is changed and the resultant state of said viologen in which the electric conductivity has been changed is used as a memorized state.

Abstract: Method for preparing a cellulose solution wherein cellulose is dissolved in a mixed solvent which is consisted essentially of an aliphatic quaternary ammonium halide, containing a lower alkyl group and a halogen, and an organic solvent capable of dissolving the halide. The dissolving process must be carried out within a heating temperature range, between 50.degree. C. and 100.degree. C., particularly preferable between 70.degree. C. and 95.degree. C., so as to keep the degree of polymerization of the cellulose at a high level.

Abstract: A macrocyclic compound represented by the following general formula: ##STR1## and a process for preparing thereof which comprises reacting an .alpha.,.omega.-dihalogenated hydrocarbon and an active methylene compound with a base in a solvent to obtain a macrocyclic compound represented by the following general formula (II): ##STR2## and then inducing the functional group of Y.sup.1, Y.sup.3 and Y.sup.5 by means of a hydrolysis, oxidation or such, and an uranyl ion capturing agent comprising a polymer chemically bonded to a functional group in a macrocyclic compound and preparation thereof.

Abstract: Monofluorobenzene is prepared in a good yield by reacting cyclopentadiene or its dimer of the formula: ##STR1## with fluorohalomethane of the formula:CHFX.sub.2wherein Xs are, same or different, halogen atoms in the presence of a phase transfer catalyst and an acid acceptor.

Abstract: A process for producing hydro-precursors for vitamin K.sub.1 and vitamin K.sub.2 which comprises reacting (A) 2-methylhydronaphthoquinone-1,4 with (B) a compound selected from the group consisting of phytyl bromide, isophytyl bromide, geranyl bromide, farnesyl bromide, geranylgeranyl bromide and the corresponding chlorides in a reaction system which comprises an aqueous phase comprising an aqueous solution of an alkali and an oily phase comprising a hydrophobic organic solvent, in the presence of a salt comprising a quaternary ammonium ion or a tetraalkyl phosphonium ion represented by the formula (I) or formula (II): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represent an alkyl or aralkyl group containing from 1 to 20 carbon atoms and the sum of the carbons in R.sub.1, R.sub.2, R.sub.3 and R.sub.4 groups is at least 12. The resultant hydro-precursor is oxidized to convert it into vitamin K.sub.1 or vitamin K.sub.2.

Abstract: A heavy metal ion adsorbent represented by the following general formula: ##STR1##wherein l, m, and n are 2 or 3, respectively; R is an alkyl group containing 4 to 6 carbon atoms which is substituted by an amino group in the .omega.-position; and A is hydrogen or a synthetic resin.

Abstract: A cyclodextrin derivative-containing a polystyrene based polymer containing units of structure having the formula: ##STR1## (wherein m is an integer of 1 to 10; n is 4, 5 or 6; R.sub.1 and R.sub.2 are hydrogen or alkyl groups containing 1 to 3 carbon atoms; and Z is an alkylene group containing 1 to 5 carbon atoms); a metal complex of the polystyrene based polymer; and a process for the production of the polystyrene based polymer or metal complex thereof.

Abstract: Alkyl cyclam resulting from substitution of one or more hydrogens of the cyclam represented by the formula ##STR1## by alkyl groups containing at least 8 carbon atoms. The alkyl cyclam can be used for capturing metal ions.