A branched organosilicon compound is provided having the general formula: (R.sup.1).sub.3—X—[SiR.sub.20].sub.n—SiR.sub.2R.sup.3. In the formula: each R is independently a substituted or unsubstituted hydrocarbyl group; each R.sup.1 is selected from R and —OSi(R.sup.4).sub.3, with the proviso that at least one R.sup.1 is —OSi(R.sup.4).sub.3; each R.sup.4 is selected from R, —OSi(R.sup.5).sub.3, and —[OSiR.sub.2].sub.mOSiR.sub.3; each R5 is selected from R, —OSi(R.sup.6).sub.3, and —[OSiR.sub.2].sub.mOSiR.sub.3; each R.sup.6 is selected from R and —[OSiR.sub.2].sub.mOSiR.sub.3; with the proviso that at least one of R.sup.4, R.sup.5 and R.sup.6 is —[OSiR.sub.2].sub.mOSiR.sub.3; 0≤m≤100; X is a divalent linking group; 1≤n≤10; and R.sup.3 has the general -D-O.sub.p—(C.sub.qH.sub.2qO).sub.r—R.sup.8. In R.sup.3, D is a divalent hydrocarbon linking group, subscript p is 0 or 1, subscript q is independently selected from 2 to 4 in each moiety indicated by subscript r, subscript r is from 1 to 500, and R.sup.8 is selected from substituted or unsubstituted hydrocarbyl groups and H.

A method of preparing an organosilanol compound is disclosed. The method comprises reacting (A) an initial organosilicon compound and (B) water in the presence of (C) a catalyst. The catalyst (C) is selected from: (C1) [(C.sub.8H.sub.12irCl].sub.2[(p-cymene)RuCl.sub.2].sub.2; and (C3) Pd/C. The initial organosilicon compound (A) has the general formula HO—Si(R).sub.2—[Si(R).sub.2O].sub.a—OSi(R).sub.2—Y and the organosilanol compound has the general formula HO—Si(R)2-[Si(R).sub.2O].sub.a—OSi(R).sub.2—Y, where each R is an independently selected hydrocarbyl group; Y comprises a functional moiety selected from alkoxysilyl moieties, epoxide moieties, and acryloxy moieties, with the proviso that Y is other than the acryloxy moieties when the catalyst (C) is (C3) Pd/C; and subscript a is 0 or 1. The organosilanol compound prepared by the method is also provided.

Branched organopolysiloxanes and organopolysiloxanes with low alkoxy content are produced in a first reaction unit by continuous feed of organohalosilanes and alcohol to a reaction vessel surmounted by a distillation column, the vessel containing an excess of water relative to the halogen content of the organohalosilanes. A second reaction unit for removing volatiles from the product from the first reaction unit is also preferably employed.

The present disclosure provides an aerogel precursor including an alkoxydisiloxane-based prepolymer and having a functional group derived from a hydrophobic sol-gel forming agent of the following Chemical Formula 1 on a surface thereof, and therefore, capable of enhancing high temperature thermal stability of an aerogel providing hydrophobic pores having uniform pore size distribution when preparing an aerogel, and an aerogel prepared using the same: ##STR00001## (in Chemical Formula 1, M, R, R.sup.1 to R.sup.4 are the same as defined in the specification.)

Silicon-based cannabidiol derivatives and methods for their synthesis are provided, in which the derivatives contain a cannabidiol molecule and at least one silicon-based group containing SiOSi bonds. The derivatives are useful in cosmetic and topical compositions, have potential beneficial topical properties, and enhance solubility and compatibility in cosmetic formulations containing the silicon-based materials. Silicone elastomers infused with compositions containing the silicon-based cannabidiol derivatives and trisiloxanes are also provided.

A method for forming monosubstituted diphenylsilanes is broadly provided. The method involves reacting diphenylsilane with an alcohol in the presence of a catalyst and a strong base activator. The reaction results in high selectivity to addition at only one hydrogen site.

Siloxanes are prepared by reacting: a compound A with a compound B or a compound A with a compound C or a compound B with a compound C or a compound C alone,
in the presence of a compound D at 40 C., wherein compound A is a silane or a siloxane having at least one silicon-bonded hydrogen atom, compound B is a silane or a siloxane having at least one silicon-bonded alkoxy moiety, compound C is a silane or a siloxane having at least one silicon-bonded hydrogen atom and at least one silicon-bonded alkoxy moiety, and compound D is a cationic Si(II) compound.

A process for preparing siloxanes wherein (a) at least one hydridosilicon compound selected from (a1) compounds of general formula (I), and/or from (a2) compounds of general formula (I), and (b) at least one carbonyl compound selected from (b1) compounds of the general formula (II), and/or (b2) compounds of general formula (II), and (c) at least one cationic compound of general formula (III) are brought into contact and reacted with one another.

The subject of the present application is a cosmetic composition for the treatment of keratinous material, in particular human hair, obtained by mixing a first agent (A) with a second agent (B), wherein the first agent (A) is obtained by reacting one or more organic C.sub.1-C.sub.6 alkoxysilanes with an amount of water equal to the molar amount of water determined according to equation (G-1),

X=[(n.sub.I(Alkoxysilane)n.sub.II(Alkoxy groups)]/n(H.sub.2O)(G-1)

Where the terms used in equation (G-1) are defined. the second agent (B) is obtained by reacting one or more organic C.sub.1-C.sub.6 alkoxysilanes with an amount of water equal to the molar amount of water determined according to equation (G-2),

Y=[(n.sub.a(Alkoxysilane)n.sub.b(Alkoxy groups)]/m(H.sub.2O)(G-2)

Where the terms used in equation (G-2) are defined.

The purpose of the present invention is to provide silanol compounds that can be used as raw materials of siloxane compounds and the like, and a composition of the silanol compounds, as well as to provide a production method that makes it possible to produce silanol compounds at excellent yield. A composition comprising 5 mass % to 100 mass % of a silanol compound represented by Formulas (A) to (C) can be prepared by devising to produce silanol compounds under water-free conditions, to produce silanol compounds in a solvent having the effect of suppressing the condensation of silanol compounds, and to perform other such processes, the composition being able to be used as a raw material or the like of siloxane compounds because the silanol compounds can be stably present in the resulting composition. ##STR00001##