Shin-etsu Chemical Co., Ltd.

Shin-etsu Chemical C O., Ltd.

Yuki Suka

Yuji Harada

Takeru Watanabe

Shiori Nonaka

Osamu Watanabe

Jun Hatakeyama

Koji Hasegawa

Kazuomi Sato

Takehiko Ishii

A method simply produces a narrowly distributed and high-purity polyalkylene glycol derivative having an amino group at an end without using a heavy metal catalyst. A method for producing a polyalkylene glycol derivative having an amino group at the end by reacting a compound represented by the general formula (V) with an alkylene oxide, then reacting a reaction product with an electrophile represented by the general formula (I), and deprotecting the obtained product without using a heavy metal:RO(RO)ROM&#x2003;&#x2003;(V) 

Method for producing polyalkylene glycol derivative having amino group at end

The present invention is a method for purifying an NCA, including the steps of: a) dissolving an NCA contaminated with impurities into a solvent which is a good solvent and is not a chlorinated solvent followed by stirring to precipitate an undissolved impurity to afford a suspension, b) adding an acidic filter aid having ability to trap a basic impurity to the obtained suspension followed by filtration and/or forming a fixed bed of the acidic filter aid having ability to trap a basic impurity followed by filtering the suspension to bring the suspension to be in contact with the acidic filter aid having ability to trap a basic impurity, and c) adding the obtained filtrate dropwise to a poor solvent for NCA to crystallize out the NCA in which the impurities are removed. This makes it possible to purify a low-purity NCA conveniently to afford a high-purity NCA.

Method for purifying an amino acid-n-carboxy anhydride

A polyalkylene glycol derivative with a minimal impurity content is prepared simply by the steps of reacting a compound having formula (III-I) or (III-II) with an electrophile having formula (IV) in the presence of an optional basic compound, to form a reaction solution containing a compound having formula (V), and passing the reaction solution through a column of cation and anion exchange resins to remove water-soluble impurities, for thereby purifying the desired polyalkylene glycol derivative.R&#x2014;R&#x2014;OR&#x2014;OR&#x2014;OM&#x2003;&#x2003;(III-I)R&#x2014;R&#x2014;OR&#x2014;OR&#x2014;OH&#x2003;&#x2003;(III-II)R&#x2014;R&#x2014;X&#x2003;&#x2003;(IV)R&#x2014;R&#x2014;OR&#x2014;OR&#x2014;R&#x2003;&#x2003;(V)

Methods of preparing and purifying polyalkylene glycol derivative

A method for producing a narrowly distributed and high-purity polyalkylene glycol derivative having an amino group at an end, a polymerization initiator for use in the method, and a precursor of the polymerization initiator are provided. The present invention provides: a method for producing a polyalkylene glycol derivative having an amino group at an end, using, as a polymerization initiator, a compound represented by the general formula (I); a compound represented by the following general formula (I); and a precursor thereof: 

Method for producing polyalkylene glycol derivative having amino group at end, polymerization initiator for use in the same, and alcohol compound as raw material for the polymerization initiator

A method for producing a narrow molecular weight distribution polyalkylene glycol derivative having an amino group at an end is provided and allows for polymerization of ethylene oxide under mild conditions with suppressed occurrence of diol polymer impurities includes at least the steps of polymerizing ethylene oxide by using a compound represented by the following general formula (2) and converting a polymer end to R: 

Method for producing polyalkylene glycol derivative with narrow molecular weight distribution, and acetal group-containing alcohol compound for use therein and alkali metal salt thereof

A method for producing a narrow molecular weight distribution polyalkylene glycol derivative having an amino group at an end under mild conditions. A method for producing a compound of the general formula (1): CHO(CHCHO)CHCHCHNH(wherein n is an integer of 1 to 450) comprises the following steps of:

Method for producing polyalkylene glycol derivative having amino group at end, with narrow molecular weight distribution

The present invention provides a polymerizable tertiary ester compound represented by the following general formula (1a) or (1b). There is provided a polymerizable ester compound useful as a monomer for a base resin of a resist composition having a high resolution and a reduced pattern edge roughness in photolithography using a high-energy beam such as an ArF excimer laser light as a light source, especially in immersion lithography, a polymer containing a polymer of the ester compound, a resist composition containing the polymer as a base resin, and a patterning process using the resist composition. 

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Joetsu, Japan

Yuki Suka