摘要:
Process for the preparation of 8,12-epoxy-13,14,15,16-tetranorlabdane by way of converting farnesyl bromide to farnesyl cyanide, followed by the saponification of the farnesyl cyanide to homofarnesic acid which is then cyclized to norambreinolide in the presence of titanium tetrachloride, converting the norambreinolide with LiAlH.sub.4 to 8-hydroxy-13,14,15,16-tetranorlabdane-12-ol, and cyclization of the diol in the presence of POCl.sub.3 to 8,12-epoxy-13,14,15,16-tetranorlabdane. The resulting product exhibits an amber scent, used in perfumery.
摘要:
A process for the preparation of homopolymers and copolymers of .alpha.-monoolefins by means of a Ziegler-Natta catalyst system comprising (1) a halide of trivalent titanium, (2) an oxygen compound (ester) having a specific formula and (3) an aluminum-alkyl, the titanium halide (1) and the oxygen compound (2) being milled together before use, wherein the catalyst system employed contains, as a further component, (4) a phenolic compound of the formula ##STR1## where R.sup.3 is C.sub.1 -C.sub.6 -alkyl, R.sup.4 is hydrogen or C.sub.1 -C.sub.6 -alkyl, p is an integer from 0 to 5 and q is an integer from 1 to 5.
摘要:
A targeted molecular weight of an organopolysiloxane is obtained in a two stage hydrolysis by hydrolyzing a chlorosilane with from 0.002 to 0.6 mol of water in a first step in the presence of alcohol, in which the pressure and/or temperature are adjusted such that following further hydrolysis in a second step, the targeted molecular weight is obtained.
摘要:
Mixtures containing high boiling and low boiling components, at least one component being dissociatable into ions, are separated effectively by heating by passing an alternating electrical current through the mixture. The process is particularly effective in the workup of crude alkylchlorosilanes from the direct synthesis.
摘要:
Substituted phenylactic acid iodopropargyl ester compounds of the general formula: ##STR1## in which R may represent hydrogen, fluorine, chlorine, bromine, iodine, methoxy, 1-imidazolyl or 1,2,4-triazolyl, X represents one or more of the same or different substituents selected from fluorine, chlorine, bromine, iodine, cyano, nitro, carboxyl, an alkyl having from 1 to 12 carbon atoms, an alkoxy having from 1 to 12 carbon atoms, a cycloalkyl having from 3 to 6 carbon atoms, formyl, acetyl, propionyl, benzoyl, phenylsulfonyl, phenyl, phenoxy, and substituted phenyl and phenoxy groups having from 1 to 3 substituents selected from fluorine, chlorine, bromine, nitro, methyl or methoxy, and n is an integer from 1 to 5 and may be zero provided that R does not represent hydrogen. The invention also relates to a process of making the compounds, which are effective ingredients of biocidal agents.
摘要:
.alpha.-Monoolefins are polymerized using a catalyst system which comprises (1) a titanium component obtained by first (1.a) preparing an intermediate from (1.a.1) titanium tetrachloride, (1.a.2) a modifier and (1.a.3) a magnesium alcoholate, and the (1.b) preparing the titanium component from (1.b.1) titanium tetrachloride, (1.b.2) the intermediate from (1.a) and, if required, (1.b.3) a further modifier, (2) an alkylaluminum and (3) a cocatalyst. In this process, (i) the titanium component (1) used is obtained by first (1.1) preparing a first intermediate from (1.1.1) titanium tetrachloride, (1.1.2) a modifier obtained from (1.1.2.1) a titanate and (1.1.2.2) a phthaloyl dichloride, and (1.1.3) a magnesium alcoholate, then (1.2) preparing a second intermediate from (1.2.1) titanium tetrachloride, (1.2.2) the intermediate from (1.1) and, if required, (1.2.3) a phthaloyl dichloride as a further modifier, and finally (1.3) preparing the titanium component from (1.3.1) titanium tetrachloride and (1.3.2) the intermediate from (1.2), and (ii) the cocatalyst (3) used is a trialkoxysilane.
摘要:
A special process for the preparation of a titanium component for polymerization catalysts of the Ziegler-Natta type, wherein (1) in a first stage (1.1) an alcoholate of the formula Mg(OR).sub.2, where R is lower alkyl, and (1.2) benzoyl chloride are milled together in a particular molar ratio in a vibratory ball mill under particular milling conditions, especially a relatively low temperature, in the absence of a diluent, thereafter (2) in a second stage (2.1) the material resulting from stage (1) is brought together with (2.2) titanium tetrachloride in a particular ratio, the batch is kept at an elevated temperature for some time, with constant mixing, and the resulting solid is isolated, excess titanium tetrachloride being removed, and finally (3) in a third stage (3.1) the solid resulting from stage (2) is again brought together with (3.2) titanium tetrachloride in a particular ratio, the batch is again kept at an elevated temperature for some time, with constant mixing, and the resulting solid, constituting the novel titanium component, is isolated, excess titanium tetrachloride being removed. The novel titanium component permits the preparation of .alpha.-monoolefin polymers in high yield and with high isotacticity.
摘要:
A special process for the preparation of a titanium component for polymerization catalysts of the Ziegler-Natta type, wherein (1) in a first stage (1.1) an alcoholate of the formula Mr(OR).sub.2, where R is lower alkyl and (1.2) a chlorotoluene of the formula ##STR1## where X is chlorine or hydrogen, are milled together in a particular molar ratio in a vibratory ball mill under particular milling conditions, especially a relatively low temperature, in the absence of a diluent, thereafter (2) in a second stage (2.1) the material resulting from stage (1) is brought together with (2.2) titanium tetrachloride in a particular ratio, the batch is kept for some time at an elevated temperature, with constant mixing, and the resulting solid is isolated, excess titanium tetrachloride being separated off, and finally (3) in a third stage (3.1) the solid resulting from stage (2) is again brought together with (3.2) titanium tetrachloride in a particular ratio, the batch is again kept for some time at an elevated temperature, with constant mixing, and the resulting solid, constituting the novel titanium component, is isolated, excess titanium tetrachloride being removed. The novel titanium compound permits the production of polymers of .alpha.-monoolefins not only in high yield but also with high isotacticity.
摘要:
Mixtures containing high boiling and low boiling components, at least one component being dissociatable into ions, are separated effectively by heating by passing an alternating electrical current through the mixture. The process is particularly effective in the workup of crude alkylchlorosilanes from the direct synthesis.
摘要:
Organopolysiloxanes with consistent product properties are prepared while minimizing alcohol usage in the hydrolysis of chlorosilanes by use of a vertical continuous loop reactor having a heating unit on an ascending side of the loop which is regulated such that the temperature of the reactant mixture is within ±5° C. of a set value.