摘要:
A catalytic Wittig method utilizing a phosphine including the steps of providing a phosphine oxide precatalyst and reducing the phosphine oxide precatalyst to produce the phosphine; forming a phosphonium ylide precursor from the phosphine and a reactant; generating a phosphonium ylide from the phosphonium ylide precursor; reacting the phosphonium ylide precursor with the aldehyde, ketone, or ester to form the olefin and the phosphine oxide which then reenters the cycle. The invention is also directed to a Mitsunobu reaction catalytic in phosphine.
摘要:
Disclased is a polymeric compound having a constitutional unit represented by formula (1a), wherein ring A and ring B independently represent an aromatic hydrocarbon ring which may have a substituent; R1 represents a group represented by formula (2); and R2 represents an aryl group or a monovalent aromatic heterocyclic group which may be substituted by an alkyl group or the like. In formula (2), Ar1 to Ar3 independently represent an arylene group or a divalent group to which two or more arylene groups are attached via a single bond; Ar4 to Ar7 independently represent an aryl group or a monovalent aromatic heterocyclic group; R6 represents a hydrogen atom, an alkyl group, an aryl group or a monovalent aromatic heterocyclic group; Ar1 to Ar7 and R6 may be substituted by an alkyl group or the like; and k and kk independently represent an integer of 0 to 3, provided that at least one of k and kk represents an integer of 1 to 3.
摘要翻译:脱水是具有由式(1a)表示的结构单元的聚合物,其中环A和环B独立地表示可以具有取代基的芳族烃环; R1表示由式(2)表示的基团。 并且R 2表示可以被烷基等取代的芳基或一价芳香族杂环基。 式(2)中,Ar 1〜Ar 3分别独立地表示通过单键连接2个以上亚芳基的亚芳基或二价基团。 Ar 4〜Ar 7分别独立地表示芳基或1价芳香族杂环基。 R6代表氢原子,烷基,芳基或一价芳族杂环基; Ar 1〜Ar 7和R 6可以被烷基等取代; k和kk独立地表示0〜3的整数,条件是k和kk中的至少一个表示1〜3的整数。
摘要:
The invention relates to a method for decarboxylating C—C bond formation by reacting carboxylic salts with carbon electrophiles in the presence of transition metal compounds as catalysts. The method represents a decarboxylating C—C bond formation of carboxylic acid salts with carbon electrophiles, wherein the catalyst contains two transition metals and/or transition metal compounds, from which one is present, preferably, in the oxidation step, which are different from each other by one unit, and catalyzes a radical decarboxylation which is absorbed during the second oxidation steps, which are different from each other by two units and catalyzes the two electron processes of a C—C bond formation reaction.
摘要:
A two-step process for the preparation of fluoroolefin compounds of formula I wherein R is hydrogen or alkyl, and R1 is alkyl or cyclopropyl, or R and R1 are taken together with the carbon atom to which they are attached to form a cyclopropyl group; Ar is phenyl or naphthyl both of which are optionally substituted; Ar1 is phenoxyphenyl, biphenyl, phenyl, benzylphenyl, or benzoylphenyl, all of which may be optionally substituted, comprising reacting fluorobromoolefin compounds of formula II with organozinc compounds of formula III or IV BrZnCH2Ar1 III Zn[CH2Ar1]2 IV in the presence of a palladium catalyst and a solvent, which compounds of formula II are obtained by reacting aldehyde compounds of formula V with (a) fluorotribromomethane, (b) a tri(substituted)phosphine or a hexaalkylphosphoramide or a mixture thereof, and (c) zinc, in the presence of a solvent, compounds of formula II.
摘要翻译:用于制备式I的氟代烯烃化合物的两步法,其中R是氢或烷基,R 1是烷基或环丙基,或R 1和R 1与它们所连接的碳原子一起形成 环丙基; Ar是任选被取代的苯基或萘基; Ar 1是苯氧基苯基,联苯基,苯基,苄基苯基或苯甲酰基苯基,其全部可以是任选取代的,包括使式II的氟代溴代烯烃化合物与有机锌化合物 式II或IV的化合物在钯催化剂和溶剂的存在下,式II化合物通过使式V的醛化合物与(a)氟代溴甲烷,(b)三(取代的)膦或六烷基磷酰胺或其混合物反应获得, 和(c)锌在溶剂存在下,式II化合物。
摘要:
The invention relates to 2,7-substituted-9-substituted fluorenes and 9-substituted fluorene oligomers and polymers. The fluorenes, oligomers and polymers are substituted at the 9-position with two hydrocarbyl moieties which may optionally contain one or more of sulfur, nitrogen, oxygen, phosphorous or silicon heteroatoms; a C.sub.5-20 ring structure formed with the 9-carbon on the fluorene ring or a C.sub.4-20 ring structure formed with the 9-carbon containing one or more heteroatoms of sulfur, nitrogen or oxygen; or a hydrocarbylidene moiety. In one embodiment, the fluorenes are substituted at the 2- and 7-positions with aryl moieties which may further be substituted with moieties which are capable of crosslinking or chain extension or a trialkylsiloxy moiety. The fluorene polymers and oligomers may be substituted at the 2- and 7'-positions. The monomer units of the fluorene oligomers and polymers are bound to one another at the 2- and 7'-positions. The 2,7'-aryl-9-substituted fluorene oligomers and polymers may be further reacted with one another to form higher molecular weight polymers by causing the optional moieties on the terminal 2,7'-aryl moieties, which are capable of crosslinking or chain extension, to undergo chain extension or crosslinking. Also disclosed are processes for preparing the disclosed compounds.
摘要:
Disclosed herein are polymers made by free radically polymerizing the novel compound vinyl(perfluorocyclopropane), and optionally other monomers to form copolymers. The repeat unit formed by vinyl(perfluorocyclopropane) contains an olefinic bond, making it particularly useful as a grafting and/or crosslinking site.
摘要:
In the process for preparing chlorotrifluoroethylene telomers by reaction of chlorotrifluoroethylene with CF.sub.3 CF or R.sub.x --CF.sub.2 OF (wherein R.sub.x may be also a perfluoroalkyl radical having 1 to 10 carbon atoms), the content of telomers with end groups --F is increased or mixtures of telomers containing species with end groups --Cl are obtained by adding F.sub.2, according to particular modalities, to the reaction medium.
摘要:
A method of combating arthropods and nematodes which comprises applying thereto, to a habitat thereof or to an area from which they are to be excluded an arthropodicidally or nematocidally effective amount of at least one long-chain halogenoolefine of the formula (I) ##STR1## in which R represents a straight-chain or branched alkyl radical with 8 to 25 carbon atoms in the straight chain, the alkyl radical optionally being interrupted once or several times by a --C.tbd.C-- and/or ##STR2## in which Z and Z.sup.1 are identical or different and represent hydrogen or methyl andR.sup.1 represents hydrogen, alkyl or halogen.Those compounds are new wherein R has at least 12 carbon atoms in the straight chain.
摘要:
Compounds of the formula ##STR1## wherein ring B stands for 1,4-phenylene or a trans-1,4-disubstituted cyclohexane ring and A stands for a group with 1 to 3 six-membered rings, which together with ring B represents a central group of formulae II-XIII; R.sup.1 signifies a straight-chain alkyl group containing 1 to 9 carbon atoms or when R.sup.1 is attached to a benzene, monofluorinated benzene or pyrimidine, ring R.sup.1 also signifies a straight-chain alkoxy group with 1 to 9 carbon atoms; and R.sup.2 signifies hydrogen, cyano or a straight-chain alkyl group containing 1 to 7 carbon atoms,their manufacture, liquid crystalline mixtures which contain said compounds and their use for electro-optical purposes are described.The compounds of formula I are especially valuable as components in liquid crystal mixtures and for the most part themselves have liquid crystalline properties.