摘要:
A process for preparing a compound of the formula: which comprises reacting a compound of the formula: wherein R1 is C1-6 straight- or branched-chain alkyl, with a compound of the formula: in an aprotic solvent in the presence of base.
摘要:
Novel .beta.-aminovinyl ketones of the general formula ##STR1## wherein R.sup.1 is, in particular, an alkenyl, alkynyl, cycloalkyl or cycloalkenyl group; R.sup.2 is, in particular, an electron-attracting substituent such as nitro, acyl, ester, alkylthio, carbamoyl, thiocarbamoyl or haloalkyl; R.sup.3 is, in particular, an alkyl or alkoxy group or a halogen atom; n is 1 or 2 and m is 0, 1, 2 or 3. A method for preparing such compounds by carrying out a condensation reaction between ketone R.sup.1 --CO--CH.sub.3 and, in particular, benzonitrile substituted by (R.sup.2).sub.n and optionally (R.sup.3).sub.m, in the presence of a strong base, as well as a process employing said .beta.-aminovinyl ketones of general formula (VI) for preparing the corresponding .beta.-diketones, are also disclosed.
摘要:
The use of a functionalized organosilicon compound as a coupling agent between an inorganic filler and an elastomer in an elastomer composition including an isoprene elastomer and a reinforcing inorganic filler is disclosed. The compound is selected among functionalized organosilicon compounds including at least one double bond C═C or C═N, and not including any C═C—C═O bonds or N═N bonds, and reacting with the isoprene units according to an electrocyclic reaction, in particular according to a standard cycloaddition reaction [2+1], [2+2], [3+2] or a Diels-Alder reaction [4+2] or an ene-synthesis reaction other than an ene-synthesis reaction between an isoprene unit and a C═C—C═O or N═N function. Also described, are elastomer composition(s) obtained and items manufactured using such compositions.
摘要:
The invention concerns the preparation of sulphur-containing organosilicic compounds of general formula (I) wherein, for example: R1═C1-C15 alkyl; R2 and R3═C1-C6 alkyl; in a mean number ranging from 1.5±0.1 to 5±0.1. Said preparation is carried out by performing successively the following steps (a), (b) and (c): (a) hydrosilylation of the type: R2R3HSi-Hal+CH2═CH—CH2-Hal}Hal-R2R3Si—(CH2)3Hal; (b) alcoholysis of the type: Hal-R2R3Si—(CH2)3-Hal+R1—OH}R′O—R2R3Si—(CH2)3Hal; (c) sulphidization of the type: R′O—R2R3Si—(CH2)3Hal+M2Sx} compound of formula (I); with Hal=a halogen atom and M=alkali metal.
摘要:
The invention concerns a method for preparing sulphonate salts, alkaline or alkaline-earth, corresponding to anion of general formula (I):(R—CF2—SO3−)n, through alkaline hydrolysis of sulphonyl chlorides corresponding to formula (II). The invention is characterized in that it comprises at least a step which consists in alkaline hydrolysis of sulphonyl chloride carried out in the presence of a phase-transfer agent.
摘要:
The invention concerns a method of sulphonation characterised in that it consists in contacting a nucleophile whose nucleophilic atom is a nitrogen atom with a reagent comprising by successive or simultaneous addition: a heavy sulphonyl halide (i.e. whose atomic number is not less than that of chlorine), advantageously suphonyl chloride; and an organic base both not capable of alkylation and lipid soluble; and the organic part of said sulphonyl is perfluorinated on the carbon carried by the sulphur. The invention is applicable to organic synthesis.
摘要:
The present invention relates to a process and a reagent useful for the synthesis of sulphanilide which is perhalogenated on the carbon borne by the sulphur atom of the sulphanilide function. This persulphonylation process is characterized in that it comprises a step of placing a nucleophile, whose nucleophilic atom is a nitrogen, in contact with a reagent comprising, for successive or simultaneous addition, a heavy halide of sulphonyl, advantageously sulphonyl chloride, and an organic base comprising a trivalent atom from column V whose lone pair is conjugated directly or indirectly to a bond, and in that the organic part of the said sulphonyl is perhalogenated, advantageously perfluorinated, on the carbon borne by the sulphur. Application to the synthesis of intermediates for organic chemistry.
摘要:
The present invention relates to a process and a reagent useful for the synthesis of sulphanilide which is perhalogenated on the carbon borne by the sulphur atom of the sulphanilide function. This persulphonylation process is characterized in that it comprises a step of placing a nucleophile, whose nucleophilic atom is a nitrogen, in contact with a reagent comprising, for successive or simultaneous addition, a heavy halide of sulphonyl, advantageously sulphonyl chloride, and an organic base comprising a trivalent atom from column V whose lone pair is conjugated directly or indirectly to a bond, and in that the organic part of the said sulphonyl is perhalogenated, advantageously perfluorinated, on the carbon borne by the sulphur. Application to the synthesis of intermediates for organic chemistry.
摘要:
A process for preparing compounds of the formula: wherein R2 is lower alkyl; or phenyl optionally substituted by from one to five groups, the same or different, which are lower alkyl, lower haloalkyl, halogen or —SR4; R3 is halogen, lower alkyl, lower haloalkyl, lower alkoxy, lower haloalkoxy, —S-alkyl, cycloalkyl having from 3 to 7 carbon atoms in the ring, alkenyl or alkynyl having from 3 to 7 carbon atoms, or -(CR5R6)—SR2 wherein q is one or two; R4 is lower alkyl; R5 and R6 independently represent hydrogen, lower alkyl or lower haloalkyl; and n is zero or an integer from one to three; intermediate compounds of the formula: and processes for preparing them.
摘要:
The invention concerns the preparation of halogenated monoorganoxysilanes, of formula (I), said compounds being useful as synthesis intermediate in organic chemistry. Said method for preparing monoorganoxysilanes consists in: using as starting product halogenoalkylsilanes of the (CH3)2SiCl2 type and in substituting the silicon with a radical bearing a divalent unit bound to an electrophilic reactive group capable of reacting with at least an appropriate nucleophilic agent to form a functionalised monoorganoxysilane of formula (II) with, for example: R =C1-C4 alkyl; R , R =C1-C6 alkyl; B=C1-C10 alkylene; m=1 or 2; Hal=halogen; W=amino, mercapto, (organosilyl)-organopolythio radical.
摘要翻译:本发明涉及式(I)的卤代单有机基硅烷的制备,所述化合物可用作有机化学中的合成中间体。 所述制备单有机基硅烷的方法包括:以(CH 3)2 SiCl 2类型的起始产物卤代烷基硅烷为原料,并用具有与能够与至少适当的亲核试剂反应的亲电反应性基团结合的二价单元的基团取代硅来形成 式(II)的官能化单有机基硅烷与例如:R 1 = C 1 -C 4烷基; R 2,R 3 = C 1 -C 6烷基; B = C1-C10亚烷基; m = 1或2; Hal =卤素; W =氨基,巯基,(有机甲硅烷基) - 有机硫基。