摘要:
The present invention relates to rigid chiral ligands useful in making catalysts for asymmetric synthesis. More particularly, the present invention relates to new monodentate and bidentate cyclic chiral phosphine ligands which are formed into catalysts to provide high selectivity of the enantiometric structure of the end-product.
摘要:
A hydroxy-carboxylate ester is converted to an amino-acid-amide by replacement of the -OH group with -N₃, via, e.g., CH₃SO₂Cl and NaN₃; reacting with amine to convert the ester to amide; and hydrogenating -N₃ to -NH₂. The present process alleviates the conventional use of blocking-deblocking procedures.
摘要:
A hydroxy-carboxylate ester is converted to an amino-acid-amide by replacement of the -OH group with -N₃, via, e.g., CH₃SO₂Cl and NaN₃; reacting with amine to convert the ester to amide; and hydrogenating -N₃ to -NH₂. The present process alleviates the conventional use of blocking-deblocking procedures.
摘要:
There are described new compounds of general formula I in which R1 is aryl or aryl substituted by C1-4-alkyl, halo-C1-4-alkyl, phenyl-C1-4-alkyl C2-4-alkenyl, halo-C2-4-alkenyl, phenyl-C2-4-alkenyl, C2-4-alkynyl, halo-C2-4-alkynyl, phenyl-C2-4-alkynyl, C1-4-alkoxy, halo-C1-4-alkoxy, phenyl-C1-4-alkoxy, C2-4-alkenyloxy, alkylsulphonyloxy, haloalkylsulphonyloxy, arylsulphonyloxy, halo-C2-4-alkenyloxy, phenyl-C2-4-alkenyloxy, halo, cyano, nitro, aryloxy, haloaryloxy, C1-4-alkylaryloxy, or nitro-C1-4-alkylaryloxy, R2 and R3 are the same or different and are hydrogen, fluorine, cyano or ethynyl, R4 is phenyl or pyridyl or these groups substituted by one or more of C1-6-alkyl, halo-C1-6-alkyl, phenyl-C1-6-alkyl, C1-6-alkyl interrupted by an O-, N- or S- atom, C2-4-alkenyl, halo-C2-4-alkenyl, phenyl-C2-4,-alkenyl, C1-4-alkoxy, halo-C1-4-alkoxy, phenyl-C1-4-alkoxy, C2-4-alkenyl oxy, halo-C2-4-alkenyloxy, phenyl-C2-4-alkenyloxy, aryloxy, haloaryloxy, C1-4-alkylaryloxy, arylamino, haloarylamino, C1-4-alkylarylamino, aryl-N-C1-4-alkylamino, aryl-N-C1-4acylamino, aroyl, haloaroyl, C1-4-alkylaroyl, aryl, haloaryl, C1-4-alkylaryl or halo, A is O or S and B is CH2 or O, processes for their preparation and their use as insecticides and acaricides.
摘要:
Amides of L-aspartyl-D-amino acid dipeptides of the formula and physiologically acceptable cationic and acid addition salts thereof wherein R a is methyl, ethyl, n-propyl or isopropyl and R is a branched aliphatic, alicyclic or heterocyclic member which is branched at the alpha carbon atom (the carbon atom bearing the amide nitrogen atom) and also branched again at one or both of the beta carbon atoms, are potent sweeteners which are free from undesirable flavour qualities and of high stability in conventional food processing. Sweetening compositions and sweetened edible compositions of such amides are also claimed
摘要:
wherein the variables are as defined in the claims and description. The compounds are useful for combating or controlling invertebrate pests, in particular arthropod pests and nematodes. The invention also relates to a method for controlling invertebrate pests by using these compounds and to plant propagation material and to an agricultural and a veterinary composition comprising said compounds.
摘要:
α-Cyanoacrylates of the formula (I), where: R1 is ORa wherein Ra is hydrogen, substituted alkyl, branched alkyl, branched alkenyl, cycloloalkyl, heterocyclyl, aryl, phenylalkyl or alkylimino; is NRbRc wherein Rb is hydrogen, alkyl which may be substituted, alkenyl, alkynyl; Rc is hydrogen, alkyl which may be substituted alkenyl, alkynyl, cycloalkyl, heterocyclyl, aryl, phenylalkyl or alkylimino; or Rb and Rc form an alkandiyl-chain which may be substituted; or is SRd wherein Rd is hydrogen, alkyl which may be substituted, alkenyl, alkynyl, cycloalkyl, heterocyclyl, aryl, phenylalkyl or alkylimino; R2 is alkyl which may be substituted; is alkenyl or alkynyl; R3 is alkyl may be substituted; is alkenyl or alkynyl; R4 is hydrogen, halogen, cyano or alkyl; and their agriculturally useful salts, processes and intermediates for their preparation; and the use of these compounds or of compositions comprising these compounds for controlling undesirable plants are described.