Provided is an organic silicon compound represented by formula (1), which when added to a rubber composition, can improve the wet traction performance of a cured product of the rubber composition, and significantly reduce a hysteresis loss of the cured product, and provides a rubber composition that can be used to implement a desired tire having high fuel efficiency. ##STR00001##
(In the formula, each R.sup.1 independently represents an alkyl group having 1-10 carbon atoms or an aryl group having 6-10 carbon atoms, each R.sup.2 independently represents an alkyl group having 1-10 carbon atoms or an aryl group having 6-10 carbon atoms, f represents a number equal to or larger than 0, e, g, and h each independently represent a number equal to or larger than 0, and m represents an integer of 1-3. Note that the repeating units can be present in any order.)

To provide an organic silicon compound having an average structural formula (1). ##STR00001##
(Z represents a 2 to 20-valent group containing an organosiloxane structure, each R.sup.1 independently represents an alkyl group or an aryl group, each R.sup.2 independently represents an alkyl group or an aryl group, each R.sup.3 independently represents a hydrogen atom, an alkyl group, an alkoxy group, or an O. (oxy radical), each R.sup.4 independently represents a hydrogen atom or an alkyl group, each A.sup.1 independently represents a single bond or an alkylene group free of a hetero atom, each A.sup.2 independently represents a single bond or a divalent linking group containing a hetero atom, m is a number of 1 to 3, p is a number of 1 to 10, q is a number of 1 to 10, and p+q represents a number satisfying from 2 to 20 corresponding to the valency number of Z.)

A compound represented by the following formula (A1) or (A2):

G.sup.1-(CH.sub.2).sub.m1CHX.sup.1(CH.sub.2).sub.n1-M Formula (A1)

M-(CH.sub.2).sub.n2CHX.sup.1(CH.sub.2).sub.m2-G.sup.2(CH.sub.2).sub.m3CHX.sup.1(CH.sub.2).sub.n3-M Formula (A2).

Where in the formula (A1) and (A2), G.sup.1, G.sup.2, X.sup.1, M, n1, n2, n3, m1, m2, and m3 are as defined in the disclosure. A method for producing a compound represented by the following formula (B1) or (B2), where M in the compound of formula (A1) or (A2) is converted into a hydrogen or hydrocarbon group represented by R.sup.3:

G.sup.1-(CH.sub.2).sub.m1CHX.sup.1(CH.sub.2).sub.n1R.sup.3 Formula (B1)

R.sup.3(CH.sub.2).sub.n2CHX.sup.1(CH.sub.2).sub.m2-G.sup.2-(CH.sub.2).sub.m3CHX.sup.1(CH.sub.2).sub.n3R.sup.3 Formula (B2).

Where in the formulas B1 and B2, G.sup.1, G.sup.2, X.sup.1, R.sup.3, n1, n2, n3, m1, m2, and m3 are as defined in the disclosure.

An object of the present invention is the use of iron compounds as hydrosilylation and dehydrogenative silylation catalysts.

There is provided herein a method for the manufacture of alkoxysilyl-containing thiocarboxylic acid ester which comprises reacting a thioester with a mercapto-functional alkoxysilane and/or an alkali metal salt, an alkaline earth metal salt, a trisubstituted ammonium salt of an alkoxysilyl-functional thiolate which uses economical and readily available reagents, avoids the use of phosgene or thionyl chloride reagents and produces byproducts that may be recycled.

In various aspects and embodiments the invention provides a method of preparing a cyclopentaoxasilinone, the method comprising contacting a siloxy-tethered 1,7-enyne with a thioether promoter. In another aspect, the invention provides a method of preparing a cyclopentaoxaborininone, the method comprising contacting a boronic ester-tethered 1,7-enyne with a thioether promoter.

The invention describes single-site metal catalysts such as Pt single-site centers on powdered oxide supports with a 1,10-phenanthroline-5,6-dione (PDO) or bis-pyrimidyltetrazine (BMTZ) ligand on powdered MgO, Al.sub.2O.sub.3, or CeO.sub.2.

The present invention relates to a perfluoropolyether group-containing silane compound represented by formula (1): RfX.sup.1X.sup.2NQ.sub.kT.sub.2-k (1), and a method for preparing the same. The present invention also relates to a perfluoropolyether group-containing silane compound represented by formula (2),

##STR00001##

and a method for preparing the same. The present invention also relates to a perfluoropolyether group-containing silane compound represented by formula (3),

##STR00002##

and a method for preparing the same. The perfluoropolyether group-containing silane compound of the present invention can be used for a surface treatment agent so that the substrates such as glass etc processed by the surface treatment agent are excellent in anti-fouling, anti-fingerprint, scrape resistant and abrasion resistant performances. Moreover, the preparation method of each of the compounds of the present invention is simple in process, easy to operate and implement.

This organopolysiloxane composition, when cured at room temperature by moisture in the atmosphere, provides a silicone rubber cured product having good self-adhesiveness to a magnesium alloy. The organopolysiloxane composition contains (A) an organopolysiloxane having a hydroxy group and/or a hydrolysable silyl group at both ends of the molecular chain, (B) an organic silicon compound other than (A) and (C), having at least three hydrolysable groups bonded to a silicon atom per molecule, and/or a partial hydrolysis-condensation product thereof, and (C) a silane coupling agent having a specific molecular structure having a carboxylic acid silyl ester bond. Furthermore, a novel compound, having an alkoxysilyl group and a carboxylic acid silyl ester group per molecule, can have improved adhesiveness/bonding properties with respect to a base material due to the effect of carboxylic acid after hydrolysis thereof.

The present invention relates to a carboxyl group containing perfluoropolyether compound of formula (I): RfX.sup.1X.sup.2(I). In the formula RfX.sup.1X.sup.2(I), Rf represents F(CF.sub.2).sub.m(OC.sub.4F.sub.8).sub.p(OC.sub.3F.sub.6).sub.q(OC.sub.2F.sub.4).sub.r(OCF.sub.2).sub.sOC(Z)F(CF.sub.2).sub.n, wherein p, q, r and s are each independently an integer of 0 or more and 200 or less, and the sum of p, q, r and s is at least 1; in the formula, the occurrence order and number of the respective repeating units in parentheses with the subscript p, q, r or s are arbitrary in the formula; m and n are each independently an integer of 0 or more and 30 or less, Z is F or CF.sub.3; X.sup.1 represents a divalent organic group; and X.sup.2 represents a COOH group.