The present invention disclose a N,O-type multidentate functional monomer(AAPTS-COOH), a preparation method thereof and an application thereof in ion-imprinted polymers, and belongs to the technical field of separation materials. The N,O-type multidentate functional monomer of the present invention is obtained through the Michael addition reaction of N-aminoethyl-γ-aminopropyltrimethoxysilane and acrylic esters, bonding an ester group to the amino group and imine group of N-aminoethyl-γ-aminopropyltrimethoxysilane, and hydrolyzing the ester group with a trifluoroacetic acid solution. The 2 nitrogen atoms and 3 oxygen atoms in the functional monomer can coordinate with metal ions. The N,O-type multidentate functional monomer prepared by the present invention can be used to prepare an ion-imprinted polymer (IIP). The imprinted material has high selective adsorption capacity for copper ions and nickel ions. In addition, the IIP synthesis method based on AAPTS-COOH of the present invention has good universality.

Provided are new nickel./zirconium-mediated coupling reactions useful in the synthesis of ketone-containing compounds, e.g., halichondrin natural products and related molecules. A feature of the present disclosure is the use of a nickel(I) catalyst in tandem with a nickel (II) catalyst in the Ni/Zr-mediated coupling reactions. Without wishing to be bound by any particular theory, the nickel (I) catalyst selectively activates the electrophilic coupling partner (i.e., the compound of Formula (A)), and the nickel(ll) catalyst selectively activates the nucleophilic coupling partner (i.e., a thioester of Formula (B)). This dual catalyst system leads to improved coupling efficiency and eliminates the need for a large excess of one of the coupling partners (i.e., a compound of Formula (A) or (B)).

The invention relates to processes for preparing carbaprostacyclin analogues and intermediates prepared from the processes. The invention also relates to cyclopentenone intermediates in racemic or optically active form.

The invention relates to processes for preparing carbaprostacyclin analogues and intermediates prepared from the processes. The invention also relates to cyclopentenone intermediates in racemic or optically active form.

Oxamidoester-functional alkylalkoxysilanes are prepared in high yield by the reaction of an alkylalkoxysilane with an oxalic diester.

The present disclosure relates to a modifier, and more particularly, to a modifier including a compound represented by Formula 1, and a method of preparing the same. Such modifier exhibits excellent dispersibility via hydrogen bonding with an inorganic filler when mixed therewith. The present disclosure also relates to a modified conjugated diene-based polymer and a method of preparing the modified conjugated diene-based polymer by using the modifier. The resulted modified conjugated diene-based polymer exhibits excellent processability, high tensile strength, high wear resistance, low rolling resistance, and high wet skid resistance.

A process prepares a cross-linked polymer containing urethane groups and silicon atoms. Starting materials of the process include a compound A) with a five-membered cyclic monothiocarbonate group, a compound B) with an amino group, selected from primary or secondary amino groups or blocked amino groups, and optionally, a compound C) with at least one functional group that reacts with a group —SH. One of the compounds contains a silicon-functional group. In one example of the process, compounds A) and B), and optionally C), are then reacted under exclusion of water to obtain a polymer with curable silicon-functional groups. The polymer is applied to a surface, gap, or a three-dimensional template. The silicon-functional groups are cured with ambient water. The polymer contains 0.001 to 0.3 mol of silicon per 100 g of the polymer.

The present invention provides an amidite compound represented by formula (1) which enables a synthesis of RNA with high purity, and the method for preparing a polynucleotide by using the same compound. (In the formula (1), wherein R represents the following formula (wherein R.sup.a and R.sup.b are identical to or different from each other and each represents a methyl group, an ethyl group, or a hydrogen atom, with the proviso that R.sup.a and R.sup.b does not represent a hydrogen atom, n is an integer of 1 to 5), and B.sup.a represents a group containing optionally protected nucleobase structure, and G.sup.1 and G.sup.2 are identical to or different from each other and each represents a protecting group for a hydroxy group, and G.sup.3 are identical to or different from each other and each represents an alkyl group. ##STR00001##

The invention relates to a silane, to a rubber mixture comprising the silane and to a vehicle tire which comprises the rubber mixture in at least one component, and to a process for producing the silane. The silane of the invention has the following formula I)
(R.sup.1).sub.oSi—R.sup.2—S—R.sup.3—S—R.sup.3—S—X,  I)
which, according to the invention, comprises the —R.sup.2—S—R.sup.3—S—R.sup.3— unit in the spacer group. The rubber mixture of the invention comprises at least one silane of the invention.

Method of synthesizing tannic acid-coordinated Fe(III)-coordination polymer frameworks (TA-Fe(III)-CPFs) includes coordinating tannic acid (TA) with an aqueous solution of iron(III) acetate (Fe(OAc)3) to form a mixture. The mixture is subjected to ultrasonic vibration for a predetermined period of time to initiate a rapid complex formation reaction. The method additionally includes forming tannic acid-coordinated Fe(III)-coordination polymer framework (TA-Fe(III)-CPFs) from the mixture.