- CURABLE COMPOSITION
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The present invention has its object to provide a curable composition which comprises a guanidine compound as a non-organotin type catalyst, is less discolored, has good surface curability, depth curability, strength rise and adhesiveness, and can retain the curability even after storage; the above object can be achieved by a curable composition which comprises: (A) an organic polymer containing a silyl group capable of crosslinking under siloxane bond formation, the silyl group being a group represented by the general formula (1): -SiX 3 (1) (wherein X represents a hydroxyl group or a hydrolyzable group and the three X groups may be mutually the same or different), (B) a guanidine compound (B-1) as a silanol condensation catalyst, and (C) a plasticizer, wherein the content of the component (B-1) is not lower than 0.1 part by weight but lower than 8 parts by weight per 100 parts by weight of the component (A), and a non-phthalate ester plasticizer accounts for 80 to 100% by weight of the (C) component plasticizer.
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- Solvent-free synthesis of azole carboximidamides
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A one-pot procedure is described for the preparation of azole carboximidamides 2, 3 and guanidinylation of amines with 3. The X-ray crystal structure of 3b, has been determined. A one-pot procedure is described for the preparation of 1H-pyrazole-carboximidamides 2, 1H-benzotriazole-carboximidamides 3 and guanidinylation of amines with 3. The X-ray crystal structure of N,N-dimethyl-1H-benzotriazole-1-carboximidamide 3b, has been determined.
- Zahariev, Sotir,Guarnaccia, Corrado,Lamba, Doriano,?ema?ar, Ma?a,Pongor, Sándor
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p. 9423 - 9426
(2007/10/03)
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- Reductive Cleavage of Hydroxylamine Derivatives by Dihydrolipoic Acid-Iron(II)
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The reduction of hydroxylamine derivatives was attempted with dihydrolipoic acid-iron(II) to obtain corresponding alcohols and amines in high yields under a mild condition (pH 9.1, 30 deg C).Some dithiols other than dihydrolipoic acid which cyclize to form disulfides were also useful for the reduction, and ferrous ion worked as an effective catalyst.From the spectroscopic and kinetic studies, the reduction was found to proceed through 1:1:1 complex formation among dihydrolipoic acid, ferrous ion, and N-O compounds.
- Nambu, Yoko,Kijima, Masashi,Endo, Takeshi,Okawara, Makoto
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p. 3066 - 3069
(2007/10/02)
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- Amidinoureas
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A new class of chemical compounds and their process of preparation is described. These compounds have valuable properties as anti-secretory, anti-spasmodic, anti-ulcerogenic and anti-diarrheal agents.
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