Abstract: The subject-matter of the invention is a process for the preparation of cyclododecanone oxime by photonitrosation of cyclododecane in the presence of hydrochloric acid, characterized in that the nitrosing agent is trichloronitrosomethane.

Abstract: A process for the preparation of organic compounds or polymers containing one or more sulphur atoms and including one or more double bonds in a hydrocarbon chain is described. An acyclic sulphur-containing olefin or an unsaturated sulphur-containing cyclic hydrocarbon undergoes a self metathesis reaction or a cross metathesis reaction with a non-sulphur-containing acyclic olefin or a non-sulphur-containing unsaturated cyclic hydrocarbon to produce novel olefins, novel dienes, and/or olefinic polymers containing one or more sulphur atoms.

Abstract: The invention relates to the preparation of alkanesulphonic acids by photo-oxidation of dialkyl disulphides.The procedure is carried out in solution in an alcohol using a light source irradiating between 200 and 320 nm.

Abstract: The invention relates to the preparation of alkanesulphonic acids by photooxidation of sulphur-containing derivatives (thiols, sulphides, disulphides).The operation is carried out in solution in aqueous or alcoholic acetonitrile, with a light source irradiating between 200 and 400 nm.

Abstract: A temporary road sign component or the like, comprising a panel integral with a stand for standing on the ground, with its base including at least two lengths of tube orthogonal to the panel and directed to rest on the ground via respective generator lines, and suitable for receiving substantially cylindrical ballasting pieces therein.

Abstract: A process for the preparation of alkanesulfonamides is disclosed. It comprises reacting an alkanesulfonyl chloride with ammonia or with an alkylamine in the presence of a chemically inert liquid diluent. The diluent is first supersaturated with ammonia or with the alkylamine before bringing it into contact with the alkanesulfonyl chloride.

Abstract: Process of polymerization of unsaturated hydrocarbons, with an initial induction period, by means of a catalyst constituted by a halogeno-phenate of tungsten, of which the phenate group carries one or more substituents, in the presence of an organometallic co-catalyst; the halogeno-phenate is chosen from amongst those represented by the formula ##STR1## where X is a halogen, especially Cl or Br, n is a whole number 2, 3 or 4, R.sup.1 is H or a C.sub.1 to C.sub.8 straight- or branched-chain alkoxy group, R.sup.2 is H or a C.sub.3 to C.sub.9 branched-chain alkyl group, R.sup.1 and R.sup.2 never being hydrogen simultaneously.

Abstract: A process for the production of an alkanesulphonic acid by hydrolyzing in the heated state an alkanesulphonyl chloride. The process is preferably continuous. The hydrolysis reaction is initiated by the instantaneous use of energy released by the state change of one of the reagents internal to the system.

Abstract: A cone expansion wall plug is provided comprising a threaded rod, an expansible socket, an expansion cone, an intermediate ring and a spacer between the head of the rod and said intermediate ring. During expansion and anchorage of the socket by the cone, the ring and the spacer prevent movement of the socket with respect to the rod. After anchorage, the rod may be screwed into the cone by shearing a collar of the spacer. During expansion, the socket only bears against the intermediate ring through a radial shoulder.

Abstract: Improved catalytic systems of long active duration, comprising initially (a) a tungsten compound, (b) an organometallic compound and (c) a partially or totally fluorinated organic compound.Process of stabilization of these catalytic systems, comprising dissolving (a) in an organic solvent, contacting (b) with (a), agitation and heating at 0.degree. to 100.degree. C. for 0.5 to 60 minutes, then introduction of (c) into the mixture of (a) and (b).Use of these stabilised catalytic systems for the metathesis of olefins which carry functional groups or do not carry such groups.

Abstract: A fastening unit with nail anchorage, is provided including a cylindrical body with a head and a support leg. The body includes a surface parallel to its axis for guiding an anchorage nail. The leg includes an expansion surface, slanted in one direction with respect to the axis of the body, and a surface for maintaining the nail under pressure, bent back in the other direction towards the axis of the body. The expansion surface extends between the guide surface and the pressure maintenance surface.

Abstract: Process of preparation of sulphonyl alkane halides by the reaction between an alkane, sulphur dioxide and a halogen, in the presence of ultraviolet light in the gaseous phase; the gaseous mixture of the reactants contains at least 4 moles of SO.sub.2 per mole of hydrocarbon.

Abstract: A fixing peg is provided comprising a body and a bearing washer for fixing an insulating panel. The body is tubular, with a support portion and an anchorage portion and is split over the whole of its length. In the anchorage portion two abutment tongues project from the lips of the slit, against which tongues the lips come into abutment during anchorage for increasing the anchorage pressure.

Abstract: Improved process of metathesis of olefins by contact of one or more olefins with a catalyst comprising a tungsten complex with two phenoxy groups, carrying substituents and four other ligands, the complex carrying as coordination groups a halogen atom, an alkyl radical and a carbene. The catalyst preferably is of the formula ##STR1## where X is halogen, R is hydrocarbon or an electronegative group or atom, R.sup.1 is alkyl and R.sup.2 and R.sup.3 are individually hydrogen or alkyl groups.

Abstract: Improved catalyst for the metathesis of olefins comprising a compound of W with a halogen and with a phenoxy group which can carry substituents. It contains 4 halogen atoms and 2 phenoxy groups per atom of W. Preferably, the phenoxy group is halogenated. This catalyst allows the more rapid carrying out of various types of metathesis reactions, when it is used as a co-catalyst in conjunction with organo-metallic compounds, particularly Al or Sn. Amongst others, it allows the economical preparation of pheromones. It is practically insensitive to traces of water and oxygen.

Abstract: The tool comprises between a barrel and a breech, a rotating loader disc provided with orifices for receiving propellant charges. Between these charge-receiving orifices there are orifices for inhibiting the sympathetic ignition of the adjacent charges.

Abstract: Improved catalyst for the metathesis of olefins comprising a compound of W with a halogen and with a phenoxy group which can carry substituents. It contains 4 halogen atoms and 2 phenoxy groups per atom of W. Preferably, the phenoxy group is halogenated. This catalyst allows the more rapid carrying out of various types of metathesis reactions, when it is used as a co-catalyst in conjunction with organo-metallic compounds, particularly Al or Sn. Among others, it allows the economical preparation of pheromones. It is practically insensitive to traces of water and oxygen.

Abstract: Halogenation of alkanes and of cycloalkanes by the action of ultraviolet upon a solution of the halogen in the alkane; the solution is prepared in advance and passes into the irradiated zone, after having been put into contact with a halogenation inhibitor. Preferably, the inhibitor, which is a metal of Group VB of the Periodic Classification, is also provided at the outlet from the reactor.

Abstract: Improvement in the photoinitiated synthesis of mercaptans, in which an ethylenic compound is treated with hydrogen sulphide, preferably under pressure, in the presence of ultraviolet radiation and a photoinitiator involves the use of a xanthenic compound, possibly substituted, as the initiator. Preferably, the xanthenic compounds is employed in conjunction with an organic compound of an element of Group V A of the Periodic Classification of the Elements.

Abstract: A magazine-indexing mechanism for a powder-actuated tool, of the type adopted for use with a disk-shaped cartridge magazine, is actuated by the same trigger displacement as actuates the firing mechanism. A first link, pinned to the receiver, and a second link, pinned to an extension of the trigger, are pinned together, with a magazine engaging hook disposed on the dictal end of the first link. When the trigger is pulled, as to fire the tool, the hook is displaced to engagement with the magazine. When the trigger is released, the engaged hook is displaced, indexing the magazine. Means are also provided to prevent indexing an unfired cartridge through the tool.