Abstract: Toxic components in a gaseous effluent containing toxic organic, chlorinated and non-chlorinated compounds are degraded by a process, comprising: contacting the gaseous effluent containing toxic components with a semiconductor metal oxide; and heating the gaseous effluent in contact with the semiconductor metal oxide to a temperature ranging from 300 to 600° C. while irradiating the gaseous effluent with ultraviolet light having a wave-length ranging from 180 to 400 nm.

Abstract: Solid mesoporous crystalline composition of a pyrophosphate-phosphate of a tetravalent metal, with a high surface area and narrow distribution of the mesopores, having formula (I):M(P.sub.2 O.sub.7).sub.1-z (HPO.sub.4).sub.2z (I)wherein: M is a tetravalent metal and z varies from 0.05 to 0.25.The process for its production is described together with its uses.

Abstract: A tetravalent metal diphosphonate-phosphite composition definable by the following general formula:M(O.sub.3 P--R--PO.sub.3).sub.1-x (HPO.sub.3).sub.2x (I)is described where:M is a tetravalent metal;x varies from 0.5 to 0.66;R is an organic radical of bivalent aromatic type, carrying side groups which increase its steric hindrance.The composition is in the form of a crystalline solid with a type .alpha. layered structure with the diphosphonic groups positioned to join said layers together by a covalent bond (pillared compounds). It has a B.E.T. surface area from 300 to 500 m.sup.2 /g depending on the nature of R in formula (I), and a porosity in the micropore radius range of less than 20 .ANG. (Angstrom), such micropores contributing to the extent of more than 95% of the total area for the most crystalline materials.

Abstract: The present invention discloses a compound comprising a diphosphonate/phosphite of a tetravalent metal:M[(O.sub.3 P--R--PO.sub.3).sub.1-(x+y) (HPO.sub.3).sub.2X (O.sub.3 P--R--PO.sub.3 H.sub.2).sub.2y ](where M, R, x and y have the meaning given in the description), in the form of a crystalline solid with an alpha-type lamellar structure with a distance between layers of 7.4 to 20.ANG. (depending on the dimensions of radical R), a BET surface area of 250 to 400m.sup.2 /g, and porosity within the mesopore range, with at least 50% of the pores measuring 20 to 30.ANG.. The compound, depending on the radical R used, may or may not have microporosity in the region between layers. Such a diphosphonate/phosphite of a tetravalent metal is obtained by reaction between diphosphonic acid, phosphorous acid and an oxyhalide of a tetravalent metal, in a solvent comprising dimethyl-sulphoxide/water containing hydrofluoric acid.

Abstract: A method is disclosed for preparing functionalized adenine derivatives, said method comprising the step of reacting a compound which contains an adenine nucleus which has been halogen substituted in the 8-position, with a compound having the general formula M.sup.+- S--(CH.sub.2).sub.n --COO.sup.- M.sup.+ wherein M.sup.+ is the ion of an alkali metal and n is an integer, the reaction being carried out in a polar aprotic solvent. Procedures for preparing macromolecularized adenine compounds are also indicated by reacting a functionalized adenine derivative with a polymer which has at least one primary or secondary aminic group in its structure. This is a division of application Ser. No. 705,012 filed July 14, 1976, U.S. Pat. No. 4,091,203.

Abstract: A method is disclosed for preparing functionalized adenine derivatives, said method comprising the step of reacting a compound which contains an adenine nucleus which has been halogen substituted in the 8-position, with a compound having the general formula N.sup.+- S--(CH.sub.2).sub.n --CO0.sup.- M.sup.+ wherein M.sup.+ is the ion of an alkali metal and n is an integer, the reaction being carried out in a polar aprotic solvent. Procedures for preparing macromolecularized adenine compounds are also indicated by reacting a functionalized adenine derivative with a polymer which has at least one primary or secondary aminic group in its structure.

Abstract: A method is disclosed for preparing functionalized adenine derivatives, said method comprising the step of reacting a compound which contains an adenine nucleus which has been halogen substituted in the 8-position, with a compound having the general formula M.sup.+- S--(CH.sub.2).sub.n --COO.sup.- M.sup.+ wherein M.sup.+ is the ion of an alkali metal and n is an integer, the reaction being carried out in a polar aprotic solvent. Procedures for preparing macromolecularized adenine compounds are also indicated by reacting a functionalized adenine derivative with a polymer which has at least one primary or secondary aminic group in its structure.

Abstract: A macromolecular adenine derivative containing at least one unity having the general formula: ##STR1## wherein, n is 1, 2, 3 or 4; the radical: ##STR2## is derived from an adenine derivative wherein the amino group in position 6 in the adenine nucleus is functional; and the nitrogen atom, N<, belongs to a macromolecular compound containing one or more primary or secondary amine groups, is prepared by condensing the functional adenine derivative with a polymer containing one or more primary or secondary amine groups in the presence of a carbodiimide. These compounds are useful in affinity chromatographies or as unspreading co-enzymes.

Abstract: Nicotinamide 6-(2-hydroxy-3-carboxy-propylamino) purine dinucleotide is prepared by reacting nicotinamide-adenine-dinucleotide with 3,4 epoxybutanoic acid in the presence of perchloric acid to prepare an intermediate wherein the adenine nucleus is alkylated in the N.sub.1 position. That intermediate is subjected to chemical reduction of the nicotinamide ring, followed by rearrangement to yield the end product wherein the amino group in position 6 of the adenine ring is alkylated.