Synthesis of Orthogonally Protected Bis(aminomethyl)malonic Acid, and Its Use as a Key Building Block in the Preparation of Cyclic Peptide Conjugates of 2-N-Alkyl-1,2,3,4-tetrahydroisoquinoline on a Solid Support
Orthogonally protected bis(aminomethyl)malonicacid (1) was synthesized and used as a key building block for the construction of cyclic peptide conjugates on a solid support. The applicability of the building block was demonstrated by preparation of 19 backbone cyclized/branched peptide conjugates of N-2-alkyl-5-(3-aminopropoxy)-1,2,3,4-tetrahydroisoquinoline as stereoisomeric pairs.
A method for producing a novel phthalocyanine compound which excels in yield and purity, allows no introduction of a chlorine atom into the phthalocyanine skeleton, and possesses relatively bulky substituents is provided.
This method is characterized by causing an orthophthalonitrile compound having a substituent exhibiting smaller σp values than σm values in the Hammett's rule to react with a metal oxide in the presence of a compound forming in the aqueous solution thereof at 25°C an acid or conjugate acid having a dissociation index pKa (the logarithmic value of the reciprocal of the dissociation constant of the acid or conjugate acid) of not more than 7.0.
Using the dope containing the following cellulose acetate (1), (2), or (3), a film is prepared by the casting process:
(1) a cellulose acetate having carboxyl groups binding to at least one member selected from the group consisting of a cellulose acetate and a hemicellulose acetate, wherein at least a part of said carboxyl groups are in an acidic form;
(2) a cellulose acetate containing at least one member selected from the group consisiting of an acid having an acid dissociation exponent pKa of 1.93 to 4.50 in water, an alkali metal salt of said acid and an alkaline earth metal of said acid; or
(3) a cellulose acetate containing an alkali metal or an alkaline earth metal wherein the total content of an alkaline metal and an alkaline earth metal in 1 gram of the cellulose acetate is from an effective amount to 5.5 x 10-6 equivalent (in terms of ion equivalent). The above cellulose acetate is also useful for spinning process. The cellulose acetate includes a cellulose diacetate and a cellulose triacetate. The cellulose acetate of the present invention has high film-releasability from a support and excellent optical characteristics.
SOLUTION OF CELLULOSE ACYLATE IN MIXED SOLVENT COMPRISING KETONE AND ESTER
申请人:Fuji Photo Film Co., Ltd.
公开号:EP1333055A1
公开(公告)日:2003-08-06
In a cellulose acylate solution, cellulose acylate is dissolved in an essentially non-chlorinated solvent. The essentially non-chlorinated solvent is a mixture of a ketone having a solubility parameter of 19 to 21 and an ester having a solubility parameter of 19 to 21. The solution further contains a releasing agent.
Film comprising a cellulose triacetate and method of producing the same
申请人:Daicel Chemical Industries, Ltd.
公开号:EP1422244A1
公开(公告)日:2004-05-26
The present invention relates to a film comprising a cellulose triacetate and to a method of producing same.
The form of the carboxyl group binding to a cellulose acetate and/or the hemicellulose acetate or the content of an alkali metal or an alkaline earth metal in a cellulose acetate affects releasability and transparency of a film or spinnability of a dope.