Nissan Chemical Industries Limited

Yoshikazu Ootsuka

Yusuke Iriyama

Akiko Yamazaki

Hideo Suzuki

Takayuki Tamura

Tomohiro Akeboshi

The invention provides a process for producing a &#x3b2;-glycoside compound represented by formula (3), characterized in that the process includes causing to react a cyclic alkene compound represented by formula (1) or (2) with a nucleophile in the presence of a transition metal catalyst. 

Process for preparation of &#x3b2;-glycoside compounds

An acylating agent and a hydrolase are caused to act on a hydroxypyranone represented by formula (I) in a water-containing organic solvent, to thereby produce an acyloxypyranone compound represented by formula (II) (wherein Rrepresents an acyl group). Then, an acetylene organic metal compound represented by formula (III) (wherein Rrepresents a hydrogen atom or a tri-substituted silyl group, and M represents an alkali metal atom, aluminum, or a magnesium monohalide) and a coordinating additive are caused to act on the acyloxypyranone compound represented by formula (II), to thereby produce an alkyne compound represented by formula (IV). The alkyne compound represented by formula (IV) is hydrolyzed with acid, to thereby produce a dihydrofuran compound represented by formula (V). 

Method for producing acyloxypyranone compound, method for producing alkyne compound, and method for producing dihydrofuran compound

A polyamic acid comprising at least 10 mol % repeating units represented by the formula [1] or [2]; and a polyimide represented by the formula [3] or [4] which is obtained from the polyamic acid. A polyimide film having high heat resistance and satisfactory in light-transmitting properties and tensile strength is obtained from the polyamic acid. (In the formulae, Rand Reach independently represents hydrogen or Calkyl; Rand Reach independently represents hydrogen, halogeno, Calkyl, or phenyl or the Rand Ron adjoining carbon atoms are bonded to each other to form Ccycloalkyl or phenyl; Rrepresents a divalent organic group; and n is an integer of 2 or larger.)

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Funabashi, Japan

Yoshikazu Ootsuka